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    EMRExperience Modification Rate

    Also known as: Experience modification, Experience factor, Mod factor

    Definition

    Experience Modification Rate: a workers' compensation rating factor comparing an employer's claim costs with expected costs for its classification.

    Editorial definition: The QHSE Standard, updated 3 October 2026 · https://qhsetech.com/glossary/emr

    Scope: Calculation periods and premium effects can differ between jurisdictions and plans; the pages opened describe no typical range.

    Sources checked: . Examples are editorial illustrations.

    What state workers' compensation pages say about experience rating

    EMR stands for experience modification rate, an insurance term that goes by several names. Washington's Department of Labor and Industries calls it an experience factor, and California's Division of Workers' Compensation says experience modification. The Washington page describes it as a forecast of whether a business's later claim costs will run above or below those of businesses in its risk classification. If the claim costs are likely to be higher, the department assigns a factor greater than 1. California's employer FAQ lists an employer's past history of work-related injuries, its experience modification, among the elements that affect the annual premium, alongside industry classification and payroll.

    The Washington page gives mechanics that are specific to its state fund. The experience period is three fiscal years, the oldest three of the four that precede the date the premium rates take effect, a choice it explains as a balance between enough data, recent conditions and claims that have matured. It describes credibility as the weight given to a firm's actual losses, with the remainder given to its expected losses, so greater credibility means actual losses count for more. For a fatal claim, the actual cost is replaced with an average fatal claim cost in the calculation. Other states and other rating plans may use different periods, thresholds and formulas, and those plan documents were not opened for this page.

    Two limits follow from that. The factor is built from claim costs, not from counts of recordable cases or hours worked, and the pages opened present it as a prediction used in setting premium, not as a measure of safety performance. The Washington page describes no typical range. Whether and how a factor changes a premium can depend on the jurisdiction and the insurer, so this page gives no range either, and Washington tells employers to contact their account manager for the calculation. It is general information about insurance rating, not insurance or legal advice, and the plan that applies to an employer governs.

    Sources opened :

    What an experience-rating record set looks like in software

    • The policy and rating details: jurisdiction, classification codes, payroll by code and the rating plan that applies.
    • The experience period, with the policy years it covers and the date the factor takes effect.
    • Claims by year with the status, the amounts paid and the reserves the insurer reports, and a flag for any fatal claim.
    • The factor issued by the rating body or insurer, with the worksheet it came from and the date received.
    • Any dispute or correction, with the reason, the evidence sent and the outcome.
    • Return-to-work and claim-management actions linked to the claims they affect.
    • The link from each claim to its incident record, so cause and cost can be read together.

    EMR, TRIR and the OSHA log

    An EMR is calculated from claim costs and expected losses for a classification, by whichever body runs the rating plan in the jurisdiction concerned, and it affects premium. TRIR and DART rate are calculated by the employer from recordable cases and hours worked, and the OSHA 300 log holds the cases themselves. The three use different data and different calculators, so a low rate does not fix a factor and a factor does not stand in for a rate. The letters also appear in other fields, such as electronic medical record, which this page does not cover.

    A hypothetical example: a weighted factor and its premium effect

    This case is invented to illustrate the idea of credibility weighting and describes no real employer or rating plan. A joinery firm has expected losses of $100,000 for its classification over the experience period and actual losses of $130,000, a plain ratio of 1.30. Suppose the plan gives its actual losses a credibility of 40 per cent. The credible actual losses are then 40 per cent of $130,000 plus 60 per cent of $100,000, which is $52,000 plus $60,000, or $112,000, and the factor is 112,000 divided by 100,000, which is 1.12.

    For this illustration only, assume the factor multiplies a base premium of $200,000, so the premium becomes $224,000, which is $24,000 more. The firm's record notes that one claim was closed late, that a return-to-work action is open and that a dispute about one claim's classification has been filed. It also notes that other plans use other formulas, so these figures cannot be reused as a forecast. The record also shows the policy years covered and the date the factor takes effect.

    Common misunderstandings about the EMR

    • An EMR is not an injury rate. It starts from claim costs and expected losses, not from recordable counts and hours.
    • A factor above 1 is not a finding that a site is unsafe. Washington's page presents it as a prediction of claim costs against peers.
    • One formula should not be assumed for every state. Experience periods, credibility and thresholds may differ between jurisdictions and plans.
    • A fatal claim is not always counted at its own cost. The Washington page describes an average fatal claim cost in its place.
    • The employer does not simply compute the factor. On the Washington page the department calculates it, and employers can contact their account manager for the calculation.

    How the EMR relates to other glossary terms

    The EMR sits beside the injury rates and the claims record rather than inside them.

    • TRIR: a rate from recordable cases and hours, calculated by the employer.
    • Severity rate: a days-based measure that is not a claim-cost factor.
    • Recordable incident: the OSHA criteria that decide what is logged, separate from claims.
    • KPI: an indicator an organisation defines for itself, unlike a rating body's factor.

    Records and evidence that usually exist for the EMR

    • The rating worksheet and the factor notice for each year.
    • Payroll by classification code for the experience period.
    • Claims listings with status, paid amounts and reserves.
    • Correspondence with the insurer or rating body about disputes.
    • Return-to-work and claim-management records.
    • Incident investigations linked to the larger claims.

    What a software tool needs to capture for the EMR

    • A claim record linked to the incident record that explains it.
    • Fields for classification code and payroll, so the base for the factor is visible.
    • Storage for each issued factor with its worksheet, period and effective date.
    • A dispute log with deadlines, evidence and outcomes.
    • Open-claim tracking with return-to-work actions and owners.
    • Reports that show cost by cause beside the factor history, without calculating the factor itself.

    Catalog profiles documenting incident recording and reporting

    The list comes from the incident platform rule. It does not show that a product holds claim costs, payroll by classification or rating worksheets, or calculates a factor, which should be tested with your own policy data.

    Same rule for every product: tagged “Incident Management” or “Incident Reporting”, with a sourced incident reporting or management capability in its record, or one the vendor stated to us, labelled as vendor-stated. Documented and conditional capabilities qualify; check the linked scope before treating a module as included.

    Tekmon pays for a sponsored placement (above); its place in this list follows the same rule as every entry. How lists are ordered

    All 55 matching profiles are shown. Documentation review, not hands-on testing or a claim of compliance.

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    Frequently asked questions

    Is an EMR the same as TRIR?

    No. TRIR is an employer-calculated rate from recordable cases and hours worked. An EMR is an insurance factor built from claim costs compared with expected losses for a classification.

    Which years does an EMR cover?

    It depends on the plan. Washington's Department of Labor and Industries uses the oldest three of the four fiscal years before the premium rates take effect, and other jurisdictions and plans may use different periods.

    Does an EMR above 1.0 mean a site is unsafe?

    Not by itself. Washington's page says a factor greater than 1 is assigned when its claim costs are expected to exceed those of other businesses in its classification, which is a prediction about cost.

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