The Score That Controls Your Workers' Comp Premium
The experience modification factor — your e-mod — is the single most powerful multiplier in your workers' comp premium. A good e-mod can save you tens of thousands of dollars. A bad one can price you out of the market entirely. This video breaks down exactly how the e-mod is calculated, what causes it to spike, and the concrete steps you can take to bring it down.
South Carolina uses NCCI to calculate experience modification factors. Your e-mod compares your actual loss history to the expected losses for businesses of similar size and industry. The formula uses three years of loss data — typically years 2 through 4 prior to the current policy year, so the most recent year is always excluded. An e-mod of 1.00 means you are exactly average for your industry. An e-mod of 0.85 earns you a 15% premium discount. An e-mod of 1.25 adds a 25% surcharge. Because the formula is applied before most other adjustments, even a small improvement has a multiplicative effect on your total annual premium. Understanding which years are in your current calculation is the first step in managing your e-mod proactively.
One of the most counterintuitive aspects of the e-mod calculation is how it treats claim size. Many SC business owners assume one large claim is more damaging than several small claims. The opposite is often true. The NCCI formula uses a split point that limits the impact of any single large claim — amounts above the split point are discounted in the formula. But every dollar of a small or medium claim counts at full value. A business with four $10,000 claims will often have a worse e-mod than a business with one $40,000 claim. The practical implication: preventing minor injuries and aggressively managing small claims matters just as much as avoiding catastrophic ones. An early return-to-work program that closes claims quickly at low cost directly improves your e-mod.
E-mod errors are more common than most SC businesses realize. NCCI maintains Unit Statistical Reports (USRs) for every carrier that reports your loss data. You or your broker can request these reports and verify that the losses attributed to your account are accurate. Common errors include: claims still listed as open that have been closed, incorrect reserve amounts, and payroll reporting mistakes. If you find an error, your broker files a correction request with NCCI through a formal dispute process. Corrections can result in retroactive e-mod revisions that lower your current and past premium. Reviewing your USR annually — not just when your renewal arrives — is one of the highest-ROI activities a SC business owner can do.
Because the e-mod uses a 3-year lookback window, improvements take time to flow through. A claim-free year begins showing in your e-mod two years later and contributes positively for three years after that. Businesses that implement aggressive safety and return-to-work programs typically see meaningful e-mod improvement within 2-3 years.
Yes. Request your Unit Statistical Reports from your broker or directly from NCCI. Review each loss entry for accuracy — incorrect reserve amounts, misattributed claims, or payroll errors are common. Submit corrections through your carrier to NCCI. Verified corrections can result in retroactive premium refunds.
For most industries, an e-mod below 1.00 is competitive. For high-hazard industries like construction or trucking, many SC carriers require an e-mod below 1.25 just to offer coverage. Getting below 1.00 opens up more carrier options and better pricing across the board.
RapidSync Specialty is launching soon. Join the waitlist to be first in line for SC workers' comp expertise built specifically for your industry.
Join the Waitlist →
