FA-63218 / Insurance premium rating / Member archive

Retrospective rating adjustment: Loss conversion factor is applied to the basic premium · case 03

Retro premiums are inflated because expense loading is converted like losses.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Input standard premium, basic, lcf, tax (x1000), min and max (per mille of standard), loss_limit, claims (negative = recovery). max<min -> 'invalid bounds'. Limited losses = max(0, sum(min(claim, limit))). Retro = (standard*basic + limited*lcf)*tax, bounded by [standard*min, standard*max] (bounds already include tax), rounded half-up. Return [limited, retro].

Why this case matters

Retrospective plans settle premium after losses, so each conversion factor and bound has to sit at the right step.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
moderate losses between bounds	`[463636, 1031530]`	`[463636, 970005]`	Failed

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