FA-59234 / Payroll withholding rules / Member archive

Pay dates in a calendar year: year end date · case 04

In leap years a December 31 pay date is left out of the count.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Input {anchor [y,m,d] (any pay date), step 7|14 days, year}. Pay dates are anchor + k*step for all integers k. Return [count of pay dates within Jan 1..Dec 31 of year inclusive, ISO date of the first one, whether the count exceeds the nominal periods (26 biweekly, 52 weekly)].

Why this case matters

Annualization factors change in 27-pay-period years; missing or extra pay dates distort per-period withholding.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression 0	`[26, "2024-01-02", false]`	`[27, "2024-01-02", true]`	Failed

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