FA-63285 / Insurance premium rating / Member archive

Mid-term endorsement pro-rata premium: Proration always uses 365 days · case 05

Short-term and leap-year policies are prorated on the wrong base.

Member previewVariant 5 · 3 implementations · 11 checks per implementation

Case contract

Input start, end (days), annual premium, endorsements [[effective day, new annual premium]]. Dates must satisfy start<=d<end and be non-decreasing, else 'invalid endorsement date'. Each endorsement charges (new-current)*(end-d)/(end-start) rounded half away from zero, and the new premium becomes current.

Why this case matters

Endorsement premiums must chain from the latest in-force rate and prorate on the actual term length.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
leap-year term	`[67970]`	`[67785]`	Failed

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