Understanding TRIR: What It Is, How to Calculate It, and Why It Matters

A general contractor receives bids from two subcontractors with identical pricing and comparable experience. One carries a TRIR of 1.2. The other carries a TRIR of 4.8. The GC awards the contract to the lower TRIR sub and moves on.

What they don’t know is whether the 4.8 reflects a genuinely dangerous operation or two minor incidents at a 40-person company that happened to require prescription medication. The number looked alarming. The context would have told a different story.

TRIR is one of the most widely used safety metrics in construction and one of the most widely misunderstood. Most contractors know they have one. Fewer know exactly how it’s calculated, what it actually measures, or how to interpret it accurately when evaluating their own performance or someone else’s.

This guide covers the TRIR definition and formula, how to calculate it correctly, what a good score looks like by trade, where the metric falls short, and how GCs use it alongside other data points in subcontractor prequalification.

What Is TRIR?

TRIR, or Total Recordable Incident Rate, is a standardized safety metric that measures how frequently OSHA-recordable workplace injuries and illnesses occur per 100 full-time employees over a one-year period. OSHA created it to give companies and regulators a consistent way to benchmark safety performance across organizations of different sizes and industries.

The calculation uses actual hours worked rather than headcount, which means a 10-person company and a 1,000-person company can be compared on equal terms. That standardization is what makes TRIR useful as a benchmarking tool and what makes it worth understanding precisely.

TRIR is a lagging indicator. It reflects incidents that have already occurred rather than predicting future risk. A company’s TRIR tells you what their safety record looked like over the past year. It doesn’t tell you whether conditions on their active job sites are safe today.

Different parties use TRIR for different purposes:

• OSHA: The agency uses TRIR to identify high-risk establishments for inspection through its Site-Specific Targeting program. Establishments with above-average incident rates face increased scrutiny and a higher likelihood of unannounced inspections.
• Insurance companies: Insurers use TRIR alongside claims history to evaluate risk and set workers’ compensation premiums. A sustained high TRIR signals elevated exposure and typically translates into higher costs.
• General contractors and project owners: GCs and owners use TRIR as a prequalification threshold when evaluating subcontractors for bid eligibility. Subs above a set threshold may be disqualified before the evaluation even begins. Subs who clear the threshold then sign subcontracts containing hold harmless agreements that transfer liability for their work to their own insurance, and their TRIR is what tells the GC how likely that transfer is to get tested by an actual claim.
• Companies: Organizations track TRIR internally to measure safety performance trends year over year and across business units, using it as one signal among several to assess whether safety programs are improving or deteriorating.

What Counts as a Recordable Incident?

TRIR only counts incidents that meet OSHA’s specific recordability criteria. The line between recordable and non-recordable determines which incidents go into the calculation, and drawing that line correctly is what makes the metric helpful.

Under OSHA’s recordkeeping regulation (29 CFR 1904.7), a recordable incident is any work-related injury or illness that results in one of the following outcomes:

• Death
• Days away from work
• Restricted work or transfer to another job
• Medical treatment beyond first aid
• Loss of consciousness
• A significant injury or illness diagnosed by a licensed healthcare professional

The critical threshold is “medical treatment beyond first aid.” If a worker cuts their hand and a supervisor applies a bandage, that’s first aid and doesn’t count. If the same cut requires stitches at an urgent care facility, then it’s recordable. That distinction matters because it means a lot of workplace incidents, including many that feel significant in the moment, never enter the TRIR calculation at all.

The construction industry’s recordable incident exposure is massive. Construction workers accounted for 46.2% of all fatal falls, slips, and trips across the entire U.S. workforce in 2021 despite representing a much smaller share of total employment. Since 2013, construction workers have suffered more than 300 fatal and 20,000 nonfatal fall-related injuries each year. A big portion of those nonfatal injuries generates recordable incidents that flow directly into TRIR calculations.

The following table shows common examples of incidents that fall on each side of the recordability line:

One category worth flagging is over-the-counter medications prescribed at higher-than-standard doses. If a doctor prescribes 800 mg of ibuprofen for a mild sprain rather than advising the employee to take a standard 200 mg tablet, that case becomes recordable even though the injury itself is minor. This is one of the more counterintuitive aspects of OSHA’s recordability criteria and one of the more common sources of TRIR inflation at companies with otherwise strong safety programs.

TRIR Reporting Requirements

Not every employer is required to track and report TRIR, but most construction companies are. The reporting obligations cover which forms to maintain, when to submit them, and which employers qualify for exemptions.

Who Must Report

OSHA’s recordkeeping requirements apply to most private sector employers with more than 10 employees. Construction falls into the category of industries with significant injury and illness exposure, which means most construction employers are covered regardless of size exceptions that apply to lower-risk industries.

Two categories of employers qualify for exemption from routine recordkeeping:

• Employers with 10 or fewer employees: Any employer that maintained 10 or fewer employees at all times during the previous calendar year is exempt from maintaining OSHA injury and illness logs. This exemption applies regardless of industry.
• Employers in low-hazard industries: Employers in industries listed on OSHA’s partially exempt industry list are exempt even if they have more than 10 employees. The list includes retail, finance, insurance, real estate, and certain service industries whose injury rates fall consistently below average.

Construction does not appear on that exempt industry list. Roofing, framing, electrical, plumbing, concrete, and virtually every other construction trade fall outside the exemption. A construction company with 11 employees has the same recordkeeping obligations as one with 500.

Even exempt employers are not entirely off the hook. OSHA can still require any employer, regardless of size or industry, to maintain records if the agency specifically requests it in writing. Exempt employers must also report any work-related fatality to OSHA within 8 hours and any work-related inpatient hospitalization, amputation, or loss of an eye within 24 hours. Those reporting obligations apply universally.

Required Forms

OSHA’s recordkeeping system uses three forms:

• OSHA Form 300: The Log of Work-Related Injuries and Illnesses. This is where you record each individual recordable incident as it occurs throughout the year, including the nature of the injury, the affected body part, the type of case, and the number of days away from work or restricted duty.
• OSHA Form 300A: The Summary of Work-Related Injuries and Illnesses. This is the annual summary compiled from your Form 300 data. It shows total counts for each case type rather than individual incident details. Employers must post the 300A in a visible workplace location from February 1 through April 30 each year.
• OSHA Form 301: The Injury and Illness Incident Report. This is a detailed report completed for each individual recordable incident, capturing information about the employee, the incident circumstances, and the treatment received.

Electronic Submission Requirements

Certain employers must submit their injury and illness data electronically through OSHA’s Injury Tracking Application each year. The annual submission deadline is March 2.

The electronic submission requirements apply to the following:

• Establishments with 250 or more employees: Employers of this size that are required to keep OSHA records must submit Form 300A data annually.
• Establishments with 20 to 249 employees in high-hazard industries: Employers in this size range who operate in designated high-hazard industries, which includes most construction trades, must submit Form 300A data yearly.
• Establishments with 100 or more employees in certain high-hazard industries: Employers meeting both the size and industry criteria must submit Form 300, Form 300A, and Form 301 data each year.

Failing to submit by the March 2 deadline exposes employers to OSHA citations and penalties. Submitting inaccurate data carries the same risk. OSHA uses electronically submitted data to populate its public injury and illness database, which means your reported incident rates are visible to GCs, owners, and prequalification programs that pull that data directly.

Can You Correct or Amend Your OSHA 300 Log?

Yes. OSHA requires employers to correct their injury and illness records when they discover an error or receive new information that changes how a case should be classified. If you recorded an incident that later turns out to be non-work-related, or if a case you initially classified as a days-away-from-work incident resolves with fewer days than originally estimated, you’re required to update the record to reflect the accurate information.

Corrections are made directly on the OSHA 300 log by drawing a line through the incorrect entry and entering the correct information. Don’t use correction fluid or erase the original entry. OSHA requires that the original entry remain legible so auditors can see what was changed and when.

The 300A annual summary must also be corrected if the underlying 300 log changes in a way that affects the totals. If you’ve already posted the 300A during the February 1 through April 30 posting period and a correction becomes necessary, update the posted summary to reflect the accurate figures.

For employers who have already submitted data electronically through OSHA’s Injury Tracking Application, corrections can be made by logging back into the ITA and resubmitting accurate data. OSHA accepts amended submissions and the corrected figures replace the original submission in the public database.

One important limitation applies to timing. OSHA’s recordkeeping regulation requires employers to retain their injury and illness records for five years. During that period, records must be available for inspection and correction if errors are identified. After five years, the retention obligation ends, but the records themselves should be kept as long as they may be relevant to workers’ compensation claims or litigation involving past incidents.

The TRIR Formula and How to Calculate It

The TRIR formula is:

TRIR = (Number of Recordable Incidents × 200,000) ÷ Total Hours Worked

Getting the inputs right is where most calculation errors occur.

The TRIR Formula

The 200,000 multiplier is the foundation of the formula. It represents the total hours 100 full-time employees would work in a year, assuming a 40-hour workweek for 50 weeks. Using hours rather than headcount is what makes TRIR comparable across organizations of vastly different sizes. A 15-person subcontractor and a 500-person general contractor can both produce a TRIR that means something when placed next to an industry benchmark.

Without that normalization, a large company with more employees would almost always show more incidents than a small company, regardless of which operation is actually safer. The formula corrects for that by expressing incidents as a rate relative to a standardized workforce size.

Step-by-Step Calculation

Working through a TRIR calculation accurately requires careful attention to what gets included in each input. Follow these steps:

• Count your total recordable incidents for the measurement period: Pull your OSHA 300 log and count every work-related injury or illness that meets OSHA’s recordability criteria under 29 CFR 1904.7. Near misses don’t count. First-aid-only cases don’t count. If the incident didn’t meet the threshold for recordability, it stays out of the numerator.
• Calculate total hours worked by all employees: This figure needs to include everyone whose day-to-day work activities your company directs, including temporary workers and staffing agency employees. What gets excluded is any time when employees were paid but not actually working. Vacation days, sick leave, FMLA leave, holidays, and bereavement leave all come out of the calculation. Use payroll records or timekeeping systems to get this right rather than estimating.
• Apply the formula: Divide your recordable incident count by total hours worked. Multiply the result by 200,000. The number you get is your TRIR for the period, expressed as recordable incidents per 100 full-time equivalent workers.

Most companies calculate TRIR on an annual basis using a calendar year, but rolling 12-month calculations are also common, particularly for companies that report safety performance to clients or prequalification programs on an ongoing basis rather than annually.

Worked Example

A commercial roofing subcontractor recorded six incidents on their OSHA 300 log over the course of a year. Their permanent workforce and three temporary workers directed by company supervisors worked a combined 480,000 hours during that period. Vacation and leave hours have already been excluded.

TRIR = (6 × 200,000) ÷ 480,000 = 2.5

The company experienced 2.5 recordable incidents per 100 full-time equivalent workers during the year. Compared against the roofing industry’s average TRIR of approximately 3.6, that result reflects safety performance meaningfully better than the industry norm. The same TRIR of 2.5 evaluated against the painting trade’s average of 1.6 would tell a very different story. The number only means something in context.

Common Calculation Mistakes

Several errors consistently produce TRIR results that don’t reflect actual safety performance. Some inflate the number, some deflate it, and all of them undermine the metric’s usefulness as a benchmarking tool.

These are the most common calculation mistakes:

• Including vacation and leave hours in total hours worked: Paid time off goes into payroll but not into the hours worked denominator. Including it inflates the denominator and artificially lowers the TRIR, making safety performance look better than it is.
• Excluding temporary or staffing agency workers: If your supervisors direct their day-to-day activities, their hours belong in your total, and their recordable incidents belong in your OSHA 300 log. Leaving them out understates both the denominator and the numerator, but the effect on TRIR depends on the relative size of each omission.
• Counting first-aid-only cases as recordable: Minor injuries treated without medical attention beyond first aid don’t meet OSHA’s threshold. Including them in the incident count inflates the numerator and produces a TRIR that overstates actual recordable incident frequency.
• Using calendar days worked instead of actual hours: Estimating hours by multiplying days by eight introduces error that compounds across large workforces. Use actual hours from payroll or timekeeping records wherever possible, and document the source of your hours figure for audit purposes.

What Is a Good TRIR?

There is no universal answer to what makes a good TRIR. The number only means something when compared against the industry average for your specific sector, and even then, the raw figure requires context to interpret accurately.

The Bureau of Labor Statistics publishes annual TRIR benchmarks broken down by industry using NAICS codes. Comparing your TRIR against the national industry average tells you very little if you’re a roofing contractor, because the national average includes office workers, retail employees, and professional services firms whose injury exposure bears no resemblance to yours. Always benchmark against your specific NAICS code.

The total recordable case rate for private industry fell to 2.3 per 100 full-time equivalent workers in 2024, down from 2.4 in 2023, the lowest figure BLS has recorded since it began publishing this data series in 2003. That headline number is a useful reference point, but trades vary significantly from it in both directions.

The table below shows how TRIR benchmarks differ across construction trades based on BLS data:

A roofing subcontractor with a TRIR of 3.8 looks concerning against the national industry average of 2.3. Evaluated against the framing contractor benchmark of 5.5, the same number looks like strong performance. The benchmark you use changes the interpretation entirely.

Context matters beyond the benchmark comparison too. A TRIR of 4.0 at a 50-person company might reflect two incidents, one of which was a bee sting that required a prescription antihistamine and another that was a mild sprain treated with prescription-strength ibuprofen.

Both are recordable under OSHA’s criteria, but neither reflects a dangerous operation. A TRIR of 2.0 at a 300-person company might reflect several serious injuries that happened to fall just below the threshold for days away from work. The raw number doesn’t tell you which situation you’re looking at. The OSHA 300 log does.

How Company Size Affects TRIR

Company size is one of the most significant factors that makes TRIR comparisons misleading when used without context. The formula normalizes for hours worked, but it can’t fully account for the statistical volatility that comes with a small workforce.

At a company with 10 employees working approximately 20,000 hours per year, a single recordable incident produces a TRIR of 10.0. At a company with 500 employees working approximately 1,000,000 hours, that same single incident produces a TRIR of 0.2.

The table below shows how dramatically a single incident affects TRIR at different company sizes:

A single bee sting that required a prescription antihistamine produces a TRIR of 10.0 at a 10-person roofing crew. That number triggers automatic disqualification on most large commercial projects. The same incident at a 500-person company barely makes a difference.

This volatility makes small subcontractors especially vulnerable to TRIR-based disqualification for incidents that don’t reflect genuine safety problems. A small electrical contractor with one minor recordable incident and an otherwise spotless record can be shut out of bid opportunities that a larger contractor with dozens of more serious incidents qualifies for simply because the larger company’s hours base absorbs the incidents more easily.

How to Evaluate TRIR at Small Companies

Applying standard TRIR thresholds to small subcontractors without adjustment produces false disqualifications and drives capable contractors out of consideration for reasons unrelated to safety performance. When you’re evaluating a small sub’s TRIR, these adjustments give you a more accurate picture than the raw number alone:

• Look at multiple years together: A single-year TRIR at a small company is heavily influenced by statistical noise. Reviewing three years of data gives you a more reliable signal about actual safety performance than any single year provides.
• Consider total incident count alongside the rate: A TRIR of 4.0 built on two incidents at a small company is a very different situation than a TRIR of 4.0 built on forty incidents at a large one. The rate looks identical. The underlying reality doesn’t.
• Review the OSHA 300 log for severity: Two minor recordable incidents that inflated a small company’s TRIR are a fundamentally different situation than two serious injuries that put workers out for months. The log shows you which one you’re actually looking at.
• Adjust thresholds based on company size and total hours worked: A tiered evaluation approach that accounts for workforce size produces more accurate results than applying a single cutoff uniformly across companies of all sizes.

How Temporary and Staffing Workers Affect Your TRIR

Temporary and staffing agency workers create one of the most common TRIR calculation errors in construction. Any worker whose day-to-day activities your supervisors direct belongs in your total hours worked, and any recordable incident involving that worker belongs on your OSHA 300 log. Most construction firms understand this in principle and get it wrong in practice.

What OSHA Requires

OSHA’s recordkeeping standard is specific about who gets included. The determining factor is supervision and control, not employment status or who writes the paycheck. A worker supplied by a staffing agency but directed daily by your foreman is your responsibility for recordkeeping purposes. Their injuries go on your 300 log. Their hours go into your calculation.

The table below shows how different staffing arrangements affect TRIR obligations:

When both the host employer and the staffing agency have recordkeeping obligations for the same worker, OSHA allows either party to record the case. What it doesn’t allow is for neither party to record it. Before work begins, GCs and staffing agencies should establish in writing which party will maintain the records to avoid disputes after an incident occurs.

The Practical Impact on TRIR

A construction company that runs 30% of its workforce through staffing agencies and excludes all of those hours from its TRIR calculation is producing a number that overstates incident frequency relative to actual exposure. A company that includes temp hours correctly produces a lower, more accurate TRIR. When both companies submit bids and one carries a higher TRIR partly because they calculate correctly, the compliance-accurate company gets penalized in the evaluation.

Getting this right matters for your own numbers and for evaluating subcontractors. When you receive a sub’s TRIR as part of prequalification, ask directly whether their calculation includes temporary and staffing agency workers. A sub who can’t answer that question clearly is worth following up with before accepting their figures at face value.

Why TRIR Matters for Contractors and Subcontractors

TRIR affects a subcontractor’s ability to win work, the price they pay for insurance, and the level of regulatory scrutiny they face from OSHA. For most subs, it’s the single safety metric that shows up in the most consequential decisions other parties make about their business.

Work-related injuries and illnesses cost employers and society $181.4 billion in 2024, including $36.8 billion in medical expenses and $54.9 billion in wage and productivity losses. The cost per medically consulted injury ran $48,000. Those figures explain why GCs, owners, and insurers pay attention to TRIR.

A subcontractor with a deteriorating safety record represents financial exposure that flows upstream. GCs who already verify subcontractor insurance requirements before work begins should treat TRIR review as the natural next step, since the same subs whose coverage you’re checking are the ones whose safety records determine how often that coverage gets tested.

The four areas where TRIR creates direct business consequences for contractors and subs are as follows:

• Bid qualification: GCs and project owners routinely set maximum TRIR thresholds as a hard prequalification cutoff. Subs above the threshold don’t get to bid, regardless of pricing, experience, or relationships. This practice is especially common on large commercial, federal, and institutional projects where owners face liability exposure from subcontractor safety failures. TRIR thresholds regularly appear alongside construction COI requirements in the same prequalification package, with GCs verifying both safety performance and insurance compliance before a sub gets approved for the bid list.
• Insurance premiums: High TRIR contributes to elevated Experience Modification Rates (EMR), which directly raises workers’ compensation premiums. The relationship between TRIR and insurance cost isn’t always immediate since EMR is calculated from claims costs rather than incident counts. But a high TRIR typically reflects the same underlying claims history that drives EMR upward. The two metrics tend to move together. Elevated TRIR also affects general liability insurance pricing, since carriers underwriting GL for construction firms factor overall safety history into their rates even though TRIR technically measures workers’ comp recordables.
• OSHA scrutiny: OSHA’s Site-Specific Targeting program uses injury and illness data to select establishments for inspection. Companies with above-average incident rates face a higher probability of unannounced visits and a more intensive review when inspectors do arrive.
• Reputation: Owners and GCs increasingly evaluate subcontractor safety performance as part of formal vendor due diligence processes. A high TRIR signals risk that extends beyond the safety dimension. It raises questions about management quality, operational discipline, and the likelihood of project disruptions from incidents, inspections, or regulatory penalties during active work. GCs evaluating subs at this level typically apply industry-specific insurance requirements alongside TRIR and EMR thresholds, because a sub’s safety record and their coverage adequacy tell different parts of the same risk story.

The Limitations of TRIR

TRIR is a useful benchmark but an incomplete picture of safety performance. Knowing its limitations is what separates contractors who use it well from those who misread it and make decisions based on a number that doesn’t mean what they think it does.

The five biggest limitations of TRIR as a safety metric are:

• It’s a lagging indicator: TRIR measures what already happened. A company’s TRIR for last year tells you nothing about the hazard exposure their workers face today, whether conditions on their active job sites have improved or deteriorated, or what their incident rate is likely to look like twelve months from now. Using it as a predictive tool produces conclusions it wasn’t designed to support.
• Company size creates significant distortion: A single recordable incident at a 10-person subcontractor produces a TRIR that would require 50 incidents at a 500-person company to match. Small subs are especially vulnerable to this volatility. One minor injury that happens to require prescription medication can swing a small company’s TRIR from excellent to disqualifying, which is why evaluating small subs on TRIR alone without considering total hours worked produces misleading comparisons.
• Minor incidents inflate the number: A worker who receives prescription-strength muscle relaxants for a back strain after lifting awkwardly is recordable. So is an employee who gets a tetanus shot after a minor puncture wound that required no further treatment. Neither reflects a systemic safety problem, but both enter the TRIR calculation the same way a serious injury does. Companies with high incident volumes of minor events can carry a worse TRIR than companies with fewer but more severe injuries.
• It doesn’t capture safety culture: A company with a low TRIR may have achieved it by discouraging incident reporting rather than by preventing incidents. A company with a higher TRIR may operate an open reporting culture that surfaces near misses and minor injuries that other companies quietly ignore. The number reflects reported incidents, not actual safety conditions.
• The 300A summary log lacks context: OSHA’s 300A form shows totals only. It doesn’t distinguish between a fatality and a laceration that required stitches, between a chronic injury and a one-time event, or between incidents that reflect systemic hazards and isolated incidents. To interpret TRIR accurately, you need to review the full OSHA 300 log, not just the summary.

Taken together, these limitations make TRIR most useful as one input among several rather than as a standalone verdict on safety performance. GCs who disqualify subs based on TRIR alone, without reviewing the underlying 300 logs or considering company size, miss a significant amount of context that the number doesn’t explain.

How to Lower Your TRIR

Your TRIR goes down when you address the conditions that produce recordable incidents, not when you manage the number itself. Companies that focus on reducing TRIR as a metric rather than reducing the incidents that drive it tend to suppress reporting rather than improve safety, which produces a lower number and a more dangerous workplace.

The strategies below address incident frequency at the source.

Build a Reporting Culture That Surfaces Problems Early

Near-miss reporting is the most reliable leading indicator of future recordable incidents. A near miss is an event that could have resulted in injury but didn’t. Companies that track and investigate near misses systematically identify hazardous conditions before they produce injuries. Companies that don’t tend to discover those same hazards through recordable incidents instead.

The barrier to near-miss reporting is almost always cultural. Workers don’t report near misses when they expect negative consequences for doing so. To build a positive reporting culture, you must first address the following conditions:

• Make reporting psychologically safe: Workers need to know that pointing out a problem won’t result in discipline or negative attention. Policies that punish incident reporting drive incidents underground and guarantee you’ll find out about hazards the hard way.
• Respond visibly to every report: When workers see that near-miss reports generate real corrective action, reporting rates increase. When reports disappear without visible response, they stop coming, and your leading indicator data dries up with them.
• Recognize proactive safety participation: Acknowledging employees who identify hazards reinforces the behavior. Recognition doesn’t need to be elaborate to be effective, but it does need to be consistent.

Implement a Structured Incident Investigation Process

Every recordable incident should trigger a root cause investigation that goes beyond identifying what happened to understanding why it happened. Surface-level investigations that conclude with “employee failed to follow procedure” rarely produce any corrective actions because they stop before reaching the systemic factors that made the failure possible.

A structured investigation process works through the following sequence:

1. Document the immediate facts: What happened, when, where, and who was involved. Collect this information while details are fresh.
2. Identify the direct cause: What specific action, condition, or failure produced the incident.
3. Identify the root cause: What management system, process, or cultural factor allowed the direct cause to exist.
4. Develop corrective actions tied to root causes: Actions that address symptoms produce the same incidents with different details. Actions tied to root causes reduce recurrence.
5. Verify effectiveness: Follow up on corrective actions to confirm they produced the intended change and not just a closed action item on paper.

Prioritize Return-to-Work Programs

A return-to-work program reduces your TRIR indirectly by reducing the number of incidents that generate days away from work and restricted duty cases, both of which feed into your DART rate. DART stands for Days Away, Restricted, or Transferred and measures serious incident frequency by filtering out recordable incidents that didn’t affect the employee’s ability to work. A lower DART rate signals severity improvement to prequalification reviewers even when your overall TRIR stays flat.

Return-to-work programs also reduce your workers’ compensation claim costs, which improves your EMR over time. The combination of a lower TRIR and an improving EMR is what prequalification programs are designed to detect as a signal of genuinely improving safety performance.

Invest in Hazard Identification and Prevention

Your most direct path to a lower TRIR is reducing the number of incidents that become recordable in the first place. The table below shows the most common causes of recordable incidents across construction trades and the prevention measures that address each one:

Construction trades with the highest TRIR benchmarks face consistent exposure to fall hazards that account for the majority of their recordable incidents. Targeted investment in fall protection systems, equipment, and training produces measurable TRIR reduction in those trades because they address the dominant cause.

The injuries these hazards produce don’t just affect your TRIR. Falls and struck-by incidents on active job sites can generate completed operations claims years later when structural failures tied to the original injury event surface during building occupancy.

Use Safety Performance in Subcontractor Selection

For GCs, one of the most effective ways to manage your project-level TRIR is through subcontractor selection. Subs with strong safety records bring lower incident exposure to your project. Subs with deteriorating safety trends bring the opposite, and their incidents become part of your numbers. Before those subs start work, verify that their additional insured endorsements are in place, because a sub with a clean TRIR whose policy doesn’t name you as additional insured still leaves you paying your own defense costs when their one bad day arrives.

PreQual by Vertikal RMS tracks TRIR and EMR trends across multiple years for each subcontractor, so the selection decision reflects trajectory rather than a single year’s figure and focuses attention on the subs whose safety record is genuinely improving.

TRIR vs. EMR: What’s the Difference?

TRIR and EMR are both safety metrics used in construction subcontractor evaluation, but they measure different things and serve different purposes. Using one without understanding the other produces an incomplete picture of a subcontractor’s safety profile.

TRIR measures how often recordable incidents happen. EMR measures the cost of past workers’ compensation claims relative to industry averages. A company with frequent minor injuries might carry a high TRIR but a moderate EMR if those accidents generated small claims. A company with infrequent but severe injuries might show a low TRIR alongside a high EMR because claims were costly even though they were rare. The two metrics can tell very different stories about the same operation, which is why sophisticated prequalification programs use both.

TRIR is an OSHA-defined metric that the employer calculates using their own incident and hours-worked data. EMR is an insurance industry metric calculated by the National Council on Compensation Insurance (NCCI) or the applicable state rating bureau, depending on jurisdiction, using claims data submitted by the employer’s workers’ compensation insurer. EMR is calculated externally and delivered to the employer, typically through their workers’ compensation insurer or directly from NCCI.

The look-back periods are also different. TRIR typically covers a single calendar year or rolling 12-month period. EMR covers three years of claims history, excluding the most recent completed year, which means it reflects a longer trend but lags current performance more significantly.

The table below summarizes the key differences between the two metrics:

Both metrics appear regularly in subcontractor prequalification requirements. GCs who evaluate only one are missing half the safety picture. Insurance endorsements like waiver of subrogation provisions also show up in the same prequalification package, since the sub’s safety performance determines how often those endorsements get tested by actual claims.

TRIR vs. DART Rate: What’s the Difference?

TRIR and DART rate are two of the most frequently confused safety metrics in construction. Both are OSHA-defined rates calculated from the same recordkeeping data, and both appear in prequalification requirements. The difference is in what each one counts.

TRIR captures every recordable incident regardless of how severe it is or how much work time it affected. A worker who needed prescription medication for a mild sprain counts the same as a worker who spent three months on restricted duty following a serious injury. TRIR treats both as one incident.

DART rate narrows that pool to a specific subset. Only cases where the worker took days away from work, accepted restricted duty, or transferred to another job enter the DART count. Medical treatment alone, without any of those outcomes, doesn’t qualify, which is what makes DART a more focused measure of injury severity than the overall incident rate.

How to Calculate DART Rate

The DART formula follows the same structure as TRIR:

DART Rate = (Number of DART Cases × 200,000) ÷ Total Hours Worked

A company’s DART rate will always be equal to or lower than their TRIR because DART is a subset of total recordable incidents. A big difference between the two numbers suggests the company has frequent minor recordable incidents but few serious ones. A DART rate that runs close to the TRIR suggests most recordable incidents resulted in days away from work or restricted duty, which reflects a more concerning injury severity profile.

The table below summarizes the most important differences between the two metrics:

GCs and prequalification programs that request both metrics get a more complete picture of a subcontractor’s safety profile than either number provides alone. A sub with a high TRIR and a low DART rate generates frequent minor incidents. A sub with a low TRIR and a high DART rate has fewer incidents, but the ones they have tend to be serious. Both patterns warrant follow-up questions during prequalification review.

How TRIR Fits Into Subcontractor Prequalification

TRIR is one of several safety metrics GCs review during subcontractor prequalification, and it works best as a part of the broader evaluation rather than as a standalone threshold. A sub who clears a TRIR cutoff has passed one screen among many.

Most GCs use TRIR in two different ways during prequalification. Many set a hard threshold, disqualifying any sub whose TRIR exceeds a defined ceiling regardless of other qualifications. Beyond that cutoff, trend analysis becomes the more meaningful signal. A sub whose TRIR has declined consistently over three years tells a different story than one whose TRIR has climbed to the same level from below. The distinction matters as much as the number.

Pairing TRIR with EMR gives a more complete safety picture than either metric alone. A sub with a moderate TRIR but a high EMR may have few incidents but costly ones. A sub with a higher TRIR but an EMR below 1.0 may generate frequent minor injuries without the severe claims that drive insurance costs. Both combinations warrant a closer look at the underlying data.

That underlying data is the OSHA 300 log. A formal prequalification process reviews both the summary TRIR figure and the full log, because the log reveals what the number conceals, including severity, cause, and whether incidents reflect systemic hazards or isolated events.

Safety performance also doesn’t exist in isolation from financial performance. A sub with a strong TRIR and poor cash flow, thin bonding capacity, or a history of project defaults creates a different category of risk that safety metrics don’t capture at all. Connecting safety data with insurance compliance through COI and prequalification integrations gives GCs a single view of each sub’s risk profile rather than checking TRIR in one system and coverage status in another.

A subcontractor prequalification program evaluates the following:

• TRIR and EMR: Reviewed together across multiple years to identify trends and flag anomalies that a single-year snapshot would miss.
• OSHA 300 log review: To understand the severity and cause of incidents behind the summary figures.
• Financial statement analysis: Balance sheet strength, cash flow, and bonding capacity reviewed by certified analysts.
• Past project performance: Completion history, default history, and references from prior GC relationships. GCs with rigorous programs also verify contractual liability coverage at this stage, confirming that each sub’s GL policy still includes the blanket provision needed to back the hold harmless clauses they’ll sign once approved.

PreQual by Vertikal RMS manages that full evaluation in one platform. Certified financial analysts review financial statements directly. Safety scorecards are customizable to each client’s risk criteria. TRIR and EMR feed into a consolidated subcontractor risk profile alongside every other factor that determines whether a sub is genuinely qualified to perform the work.

How to Find a Subcontractor’s TRIR

A subcontractor’s TRIR isn’t always something they’ll volunteer, and self-reported figures aren’t always accurate. Three sources provide you with access to safety data independently of what a sub tells you directly, ranging from OSHA’s public database to formal prequalification submissions to third-party verification platforms.

OSHA’s Injury Tracking Application Database

OSHA publishes injury and illness data submitted through its Injury Tracking Application on its public website. Establishments required to submit electronically have their data included in OSHA’s searchable database, which means you can look up reported incident rates for many construction companies without requesting the information from the sub directly.

The database isn’t comprehensive, though. Smaller establishments below the electronic submission thresholds don’t appear, and the data lags by approximately one year. But for larger subcontractors operating in high-hazard industries, it’s a useful starting point for independent verification before requesting formal documentation.

Direct Request During Prequalification

The most reliable way to obtain a subcontractor’s TRIR is to require it as part of a formal prequalification submission. Ask for three years of TRIR data along with the OSHA 300A summary forms that back up the numbers. Three years of data show whether a sub’s safety performance is improving, holding steady, or deteriorating, which matters as much as any single year’s figure.

Require the sub to submit their OSHA 300 logs alongside the summary forms. The logs show individual incident detail that the summary figures don’t contain, including severity, body part affected, days away from work, and cause. A sub who resists providing the full 300 log is worth scrutinizing further.

Industry Prequalification Platforms

Third-party prequalification platforms collect and verify safety data from subcontractors as part of their standard submission process. These platforms cross-reference self-reported TRIR figures against OSHA’s public database and workers’ compensation claims history, flagging discrepancies that manual review would miss. A comparison of the leading prequalification platforms shows how widely safety verification capabilities vary, from basic form collection to full analyst-reviewed evaluations with independent data checks.

PreQual by Vertikal RMS collects TRIR and EMR data as part of its prequalification workflow, combining self-reported figures with independent verification and analyst review. The platform maintains a consolidated safety profile for each subcontractor that updates as new data becomes available, so GCs aren’t relying on figures that may be two years old by the time a bid comes in.

Using TRIR to Make Better Decisions

TRIR is most valuable when you treat it as a starting point rather than a verdict. The number tells you something real about a company’s recent safety record, but it doesn’t tell you whether that record reflects real hazard exposure, a small workforce absorbing statistical noise, a reporting culture that actively brings problems forward, or one that buries them.

The contractors and GCs who use TRIR well ask the questions behind the number. They look at trend direction over multiple years. They review the OSHA 300 log to understand severity and cause. They pair TRIR with EMR to get both frequency and cost in the same picture. They account for company size before applying a threshold. And they recognize that a sub with a slightly elevated TRIR and a documented improvement trajectory may represent less risk than one with a low TRIR and no insight into how they achieved it.

For GCs managing subcontractor rosters at scale, that level of evaluation requires a structured process. Reviewing TRIR in isolation, through a spreadsheet or a single-year prequalification form, produces the kind of incomplete picture that leads to disqualifying capable subs and approving risky ones.

PreQual by Vertikal RMS gives GCs a structured process for that kind of multi-factor evaluation at scale. When a roster includes dozens of subs, reviewing TRIR along with financial health and past project performance requires a platform built for it, not a spreadsheet that’s only updated once a year.