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Pro-Rata Cancellation Calculator

Estimate earned premium and the return premium on a mid-term policy cancellation, with an optional short-rate penalty.

calculatorPublished 2026/09/21Last verified 2026/09/21

Pro-Rata Cancellation Calculator

Estimate earned premium and the return premium on a mid-term cancellation, with an optional short-rate penalty.

Pro-rata refund

$960.00

73 of 365 days in force

MetricValue
Earned premium$240.00
Pro-rata refund$960.00
Short-rate refund—

Simplified estimate. Short-rate tables differ by insurance company and are often not a flat percentage, and minimum earned premium or policy fees may apply. The policy and the insurance company's own calculation determine the actual return premium.

FAQs

What is the difference between pro-rata and short-rate cancellation?
A pro-rata cancellation refunds the unearned premium in proportion to the days left in the term. A short-rate cancellation refunds less than that, because the insurance company keeps an additional penalty, usually when the insured asks to cancel.
How is the short-rate penalty applied in this calculator?
The penalty percentage is applied to the pro-rata refund. For example, a 10% penalty on a 960 dollar pro-rata refund leaves a short-rate refund of 864 dollars.
Why does my insurance company's refund differ from this estimate?
Insurance companies use their own short-rate tables, and policies may include a minimum earned premium, non-refundable fees, or taxes. The policy and the insurance company's calculation are what count.
Should I use 365 or 366 days for the policy term?
Use the actual number of days in the policy period. A term that includes February 29 has 366 days, and a short-term policy has fewer.

Related Terms

  • Pro-Rata Cancellation

    Cancellation returning premium in exact proportion to the remaining policy period, with no penalty — standard when the carrier initiates cancellation.

  • Short-Rate Cancellation

    Insured-initiated cancellation where the return premium is calculated at a penalized rate, retaining more than the earned pro-rata share.

  • Minimum Earned Premium

    The floor premium an insurer retains on cancellation regardless of the pro-rata calculation — typically set at 25-30% of the annual premium.

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What this tool does

The Pro-Rata Cancellation Calculator estimates how much premium has been earned and how much would be returned when a policy is cancelled before the end of its term. You can add an optional short-rate penalty to see how a penalty reduces the refund.

How it calculates

  • Earned premium = policy premium × (days in force ÷ policy term in days)
  • Pro-rata refund = policy premium − earned premium
  • Short-rate refund = pro-rata refund × (1 − penalty %)

The penalty is applied to the unearned (refundable) portion. A pro-rata cancellation returns the unearned premium in full, while a short-rate cancellation keeps an extra amount as a penalty, typically when the insured initiates the cancellation.

Limits of this estimate

This is a simplified estimate. Short-rate tables differ by insurance company and are often not a single flat percentage. Policies may also carry a minimum earned premium, policy fees, or taxes that are not refundable. The policy wording and the insurance company's own calculation determine the actual return premium.