First retro formula timing in a retrospective policy?

First retro formula timing in a retrospective policy?

• A. 18 months after inception
• B. 6 months after inception
• C. Immediately
• D. 24 months after inception

Answer: (A)

In retrospective rating, the final premium is adjusted after the policy period using actual losses, so the timing of the first retro calculation must wait until there is enough loss data to produce a credible estimate of ultimate losses. In workers’ compensation, claims development takes time, with many losses still evolving well after the policy starts. Waiting about 18 months provides a mature enough data set for a meaningful retro calculation, balancing accuracy with timely alignment of premium to experience. Calculating too early (immediately or at 6 months) relies on immature data and would yield an unstable estimate, while waiting longer (24 months) delays adjustments beyond what’s typically needed. That’s why the first retro formula timing is around 18 months after inception.

In retrospective rating, the final premium is adjusted after the policy period using actual losses, so the timing of the first retro calculation must wait until there is enough loss data to produce a credible estimate of ultimate losses. In workers’ compensation, claims development takes time, with many losses still evolving well after the policy starts. Waiting about 18 months provides a mature enough data set for a meaningful retro calculation, balancing accuracy with timely alignment of premium to experience. Calculating too early (immediately or at 6 months) relies on immature data and would yield an unstable estimate, while waiting longer (24 months) delays adjustments beyond what’s typically needed. That’s why the first retro formula timing is around 18 months after inception.