PA Workers Comp Calculator
Comparison · PA Workers' Comp 2026
Retrospective Rating vs. Guaranteed Cost Workers' Comp in PA
Large PA employers often have a choice between guaranteed cost workers' comp (your premium is set at inception and won't change based on claims) and retrospective rating (your final premium is directly tied to your actual losses). The choice involves a fundamental risk/reward trade-off.
Retro Rating vs. Guaranteed Cost — Feature Comparison
| Feature | Retro Rating | Guaranteed Cost |
|---|---|---|
| Premium at inception | Estimated only | Fixed (subject to audit) |
| Final premium | Based on actual losses | Same as at inception (audit-adjusted) |
| Budget certainty | Low | High |
| Loss control incentive | Direct financial incentive | Indirect (via EMR) |
| Minimum account size | ~$100K annual premium | Any size |
| Best loss year outcome | Premium near minimum (big savings) | Pay standard rate |
| Worst loss year outcome | Premium near maximum | Pay standard rate |
Bottom Line
Guaranteed cost is appropriate for most PA employers — it provides certainty and requires no complex loss-year analysis. Retrospective rating makes sense for larger employers (typically $100K+ annual premium) who have consistently low loss ratios, strong safety programs, and the financial capacity to absorb a bad-year maximum premium. If you're considering retro, run 3–5 years of historical loss data through the retro formula before committing.
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Frequently Asked Questions
What is the minimum premium for a retro rating plan in Pennsylvania?
Most PA carriers require at least $100,000 in annual workers' comp premium for retro rating eligibility. Some carriers set the threshold at $150,000–$250,000. Check with your broker for current carrier minimums.
How long do retro adjustments continue after the policy year?
Typically 3 years after the policy year. Retro plans are typically adjusted at 12, 24, and 36 months post-policy period as claims develop and close. The final adjustment is usually made around 36 months, though very complex claims can extend this.
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