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What is your experience mod really costing you?

Your workers' comp mod sets your premium and decides which bids you can chase. Turn it into dollars, check the math on your NCCI worksheet, and see what one more claim would do, in a couple of minutes.

What you pay for the year, from your policy or invoice.

Printed on your worksheet or policy declarations, for example 0.92 or 1.15.

Enter your premium and mod to see what your mod is worth in dollars.

Want a specialist to go through your mod?

A licensed Aiden specialist reviews your worksheet and loss runs for errors, misclassified claims and the payroll and class code issues that inflate a mod, then shows you what it is worth to fix. Your calculator results are sent with your request.

Prefer to talk? Call (650) 263-6399

How a mod works

Three things that move your mod

The formula is public, and once you know what drives it, you know where a mod can be brought down.

Primary losses count in full

Each claim is split at your state's split point. Everything below it counts toward your mod at full weight, so a run of small claims moves a mod more than one large claim of the same total.

Weight and ballast protect small employers

The weight (W) decides how much of the excess above the split point counts, and the ballast (B) steadies the result. Both grow with your expected losses, which is why larger employers see bigger swings.

A claim stays for three years

Your mod is built from three policy years of payroll and losses, usually skipping the most recent year. One claim affects three renewals, which is where its real cost shows up.

Mod = (Ap + W × Ae + (1 − W) × Ee + B) ÷ (E + B)

Ap and Ae are your actual primary and excess losses, E and Ee your expected total and excess losses, W the weight and B the ballast. The NCCI Experience Rating Plan formula.

FAQ

Experience mod questions, answered

An experience mod is a multiplier on your workers' compensation premium that compares your actual claims with the claims expected for a business of your size and type. A mod of 1.00 is average. Below 1.00 earns a credit, above 1.00 adds a surcharge. General contractors and owners also read it as a safety score when they prequalify subcontractors.
In NCCI states the formula is (Ap + W x Ae + (1 - W) x Ee + B) / (E + B). Expected losses come from your payroll in each class code multiplied by that class's expected loss rate. Actual losses come from your claims in the experience period, split into primary and excess at the state split point. The weight and ballast values depend on your expected losses and are printed on your worksheet.
Every dollar of a claim up to the split point is a primary loss and counts in full, while the excess above it is discounted by the weight. Five $10,000 claims put far more primary loss on your worksheet than one $50,000 claim, so frequency usually does more damage than severity.
The split point is the dollar amount where each claim is divided into primary and excess loss. NCCI now sets it by state and updates it with each annual rate filing, so use the figure printed on the summary page of your own worksheet.
Many general contractors and owners use 1.00 as a prequalification cutoff, and some ask for 0.90 or lower on larger projects. Requirements vary by bid package, so check each one. A mod over the cutoff can keep you off a bid list no matter how good your price is.
Of the 16 states where Aiden is licensed, Arizona, Colorado, Florida, Georgia, Illinois, Maryland, Texas and Virginia use NCCI's experience rating plan. California, Delaware, Massachusetts, New Jersey, New York and Pennsylvania have their own rating bureaus with different formulas, and Ohio and Washington run state funds with their own programs. The mod cost view works in every state; the worksheet check is built for NCCI worksheets.
Yes. Common errors include payroll reported in the wrong class code, claims that closed for less than their reserve but still show the old amount, recoveries that were never credited, and medical-only claims recorded as lost-time. A licensed specialist can check your worksheet and loss runs against each other and help you request a correction.
It is free and needs no signup. Your numbers stay in your browser. They are only sent to Aiden if you ask a specialist to review your mod.
Contractor workers' comp

A lower mod starts with a clean worksheet.

Aiden's AI watches your risk year-round, and a licensed specialist checks your worksheet and loss runs, raises errors with your carrier and places your workers' comp with the best-fit carrier.

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