FA-59145 / Payroll withholding rules / Member archive

W-4 exempt claim expiration: claim effective date · case 05

A W-4 received on the pay date is ignored for that paycheck.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Input {claims: [[[y,m,d], exempt]], pay_date [y,m,d]}. The active claim is the latest-dated claim on or before the pay date (claims processed by date; equal dates keep input order, last wins). No claim -> 'single-default'. Non-exempt claim -> 'per-form'. Exempt claim is honored through February 15 of the year after it was filed, inclusive; afterwards 'single-default'.

Why this case matters

Exempt status must lapse on a fixed date, reverting to default withholding until a new form arrives.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression 0	`"single-default"`	`"per-form"`	Failed

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