You spend an entire career earning your federal benefits, and then one of the highest-leverage decisions comes down to a single square on the calendar. Pick the right retirement date and you collect every dollar of final pay, leave, and pension you've earned. Pick a day too early — or one day too late — and you can quietly forfeit a full month's pension or a chunk of leave. The rules are simple once you see them.
Three calendar rules that move real money
Almost everything about retirement-date timing comes down to three levers. The best dates are the ones where they line up.
Rule 1 — Retire at the end of the month
Under FERS, your annuity begins the first day of the month after you separate. So if you retire on the last day of a month, your pension starts the very next day — no gap. But if you work even one day into a new month, your annuity still doesn't begin until the first of the following month, and you get nothing for those extra days you worked.
The one-day mistake
Retire June 30 → pension starts July 1. · Retire July 1 → pension starts August 1
Working that single extra day costs you a full month of pension — often several thousand dollars.
This is why the last day of the month is always a strong retirement date. (Note: this is the FERS rule. The older Civil Service Retirement System (CSRS) has a separate first-three-days-of-the-month grace provision that FERS employees don't get.)
Rule 2 — Retire at the end of a pay period
Your annual and sick leave accrue only at the end of each pay period — not day by day, and not partially. Retire in the middle of a pay period and you forfeit that entire period's accrual. Retire on the last day of the pay period, usually a Saturday, and you bank your final 4 to 8 hours of annual leave plus your sick-leave accrual. On a Monday–Friday schedule, that often means your effective last working day is the Friday before.
Rule 3 — Retire at the end of the leave year
This is the big one for anyone with a large leave balance. Your unused annual leave is paid out as a lump-sum check at your hourly rate. Normally you can only carry over 240 hours from one leave year to the next — anything above that is "use-or-lose." But there's a key exception: if you retire before the leave year ends, you're paid out for your entire balance, including everything above the 240-hour cap.
Why It Pays
Say you've banked 360 hours. Retire just before the leave year rolls over and you get a lump sum for all 360. Wait until after the rollover and the 120 hours above the cap simply vanish. That's why so many federal employees target the very end of the leave year — and why nearly 40% of all federal retirements happen at year's end.
The sweet spot — and the best dates right now
The ideal retirement date is where these rules overlap: the end of a pay period that also falls at the end of a month, and ideally at the end of the leave year. Here are the standout dates for the rest of 2026 and into early 2027 (current as of June 2026):
| Date | Why it's a strong date |
|---|---|
| Oct 31, 2026 | End of a pay period and the last day of the month (a Saturday). Full final leave accrual, pension starts Nov 1, no gap — the standout date of the year. |
| Nov 28, 2026 | End of a pay period near month-end. A clean late-fall option; pension begins in December. |
| Dec 31, 2026 | Falls mid-pay-period (you give up ~8 hours of leave), but it's a clean calendar-year close and your lump sum lands in 2027 — useful if your tax bracket drops next year. Pension starts Jan 1. |
| Jan 9, 2027 | End of a pay period and the 2026 leave year — the maximum annual-leave-payout date, letting you cash out every hour above the 240 cap, plus a little 2027 salary first. |
Always confirm dates against your own agency's payroll calendar, since some differ slightly. The May 2026 and January 10, 2026 dates that circulated earlier in the year have already passed.
The bigger levers beyond the calendar
Before you fine-tune the exact day, make sure you're not stepping over a much larger benefit a few months away. These can dwarf the calendar optimization:
- The 1.1% multiplier. Retiring at age 62 with 20+ years raises your pension multiplier from 1.0% to 1.1% — a permanent 10% boost. See how the pension is calculated.
- FERS Supplement eligibility. Reaching your Minimum Retirement Age (MRA) with 30 years, or age 60 with 20, unlocks the FERS Supplement until 62 — worth confirming before you set a date.
- Your High-3. A recent pay raise keeps lifting your high-3 average the longer it stays in your highest 36 months, and the January 2027 pay raise will also raise the hourly rate your leave lump sum is paid at.
Don't Forget
Your leave lump sum is taxable income in the year you receive it, so a December-versus-January retirement can shift it into a lower-income tax year. And before locking any date, confirm you've met the FEHB 5-year rule so your health coverage follows you into retirement.
Bottom line
Start with eligibility and the big milestones — the multiplier, the supplement, your high-3 — then choose the best calendar date that fits. For most federal employees, that means the last day of a pay period that also closes out a month, with the end of the leave year as the prize date if you're sitting on a big leave balance. And submit your paperwork early: a clean date does you no good if the application is late.
Frequently asked questions
What's the best day of the month to retire under FERS?
The last day of the month. Your annuity starts the first of the following month, so the last day means no gap and no lost pension. Work one day into a new month and you forfeit a full month of pension.
Why retire at the end of a pay period?
Leave accrues only at the close of a pay period. Retire mid-period and you lose that period's annual and sick leave entirely. The last day — usually a Saturday — locks in your final accrual.
What date maximizes my annual leave payout?
The end of the leave year. Retiring before the rollover pays out your full balance, including hours above the 240-hour carryover cap. For the 2026 leave year, that's around January 9, 2027.
Does the 1.1% multiplier affect my retirement date?
Often more than the calendar does. Retiring at 62+ with 20+ years gives a permanent 10% larger pension, so reaching that milestone usually matters more than the exact day.
When will I get my annual leave lump sum?
Usually within about 30 to 45 days of retiring. Many retirees use it to bridge the weeks before their first full annuity check arrives. It's taxable in the year received.