Absence Accrual Edge Cases: Where Clean Policies Get Messy
The absence policy reads clean on one page. Then a part-timer changes hours mid-year and the accrual maths falls apart. Design for that.
Absence policies always read beautifully on a single page. Then reality shows up: someone goes from full-time to three days a week in June, and suddenly the accrual maths nobody thought about is wrong for the rest of the year. The edge cases are the whole job.
Handle mid-year FTE changes
When someone's working pattern changes, their accrual should adjust from that point, not retrospectively wipe or double what they've earned. Configure the proration to handle a mid-year change cleanly, and test it with a real date.
Get the term-time and irregular workers right
Term-time only, annualised hours, casual, these break simple accrual rules. If you employ them, their accrual method needs designing specifically, not forcing them through the standard plan and correcting by hand.
Decide the rounding rule and stick to it
Accruals produce fractions of days. Round up, down, to the half-day? Pick a rule that matches policy and apply it consistently, because employees add it up and notice inconsistency.
Real scenario: a client had a chunk of staff who dropped to part-time mid-year. Their accrual just kept running at the full-time rate, over-granting leave the company then tried to claw back, which went down like a lead balloon. We fixed the mid-year FTE proration. The clawback conversations stopped, because the numbers were finally right from the start.