Best Days to Retire Under FERS
The Date You Choose Matters More Than You Think
Many federal employees spend years planning their retirement — but overlook one of the most impactful decisions: the exact calendar date on which they submit their paperwork.
Under FERS, the date you retire directly affects:
- ·When your first pension payment arrives
- ·Whether you lose any pay days
- ·How your sick leave credit is calculated
- ·Whether you miss your annual leave accrual for the final pay period
Disclaimer: This article is for educational purposes only and does not constitute financial or legal advice. Always verify your retirement date with your agency HR office and OPM before submitting paperwork.
The Golden Rule: Retire on the Last Day of a Month
The single most important rule for FERS employees: retire on the last day of a month — ideally December 31st, but any month-end works.
Here's why:
How FERS Pension Start Date Works
Your FERS annuity begins the first day of the month following the month in which you retire. So:
| Retirement Date | Annuity Begins | |---|---| | January 31 | March 1 | | June 30 | August 1 | | December 31 | February 1 | | January 15 | March 1 | | June 15 | August 1 |
Notice that retiring on January 15 gives you the same annuity start date as retiring on January 31 — but you worked an extra half-month for free.
The takeaway: Retiring mid-month costs you two weeks of federal pay with no corresponding benefit.
Why December 31st Is Special
Retiring on December 31st has additional advantages:
1. Full-Year Annual Leave Accrual
Federal employees accrue leave based on their leave year (which usually ends in early January). Retiring on December 31st typically allows you to accrue your final year of leave through the last full pay period of the year — maximizing your annual leave lump-sum payout.
2. Calendar Year Benefits Continuity
- ·Your Federal Employee Health Benefits (FEHB) remain in effect for the full year
- ·TSP contribution eligibility through year-end
- ·Cleaner tax reporting
3. Pension Starts February 1st
Your first full pension payment arrives February 1st — a clean start to the new year.
What About CSRS Employees?
CSRS employees have slightly different rules. CSRS annuities begin on the first day of the month for those who retire on the last calendar day of the previous month, or the first three days of the month.
Best CSRS retirement dates: Last day of month (e.g., December 31) or the first three days (January 1, 2, or 3). This is a unique CSRS quirk — retiring January 1–3 starts your annuity on February 1 with no gap.
Sick Leave and the Retirement Date
Your sick leave balance at retirement is converted to additional creditable service using a factor of 2,087 hours per year. This calculation happens at your exact retirement date — so timing matters.
If you're close to a threshold (say, 1,500 hours vs. 2,087 hours), it may be worth staying a bit longer to cross a full-year boundary and earn the extra service credit.
The Annual Leave Strategy
Unlike sick leave, unused annual leave is paid out as a lump-sum cash payment at your hourly rate. Most GS employees can carry up to 240 hours (30 days) into the next leave year; SES employees can carry up to 720 hours.
Strategy: Stop using annual leave in the final months of your career and let it accumulate. This turns days off into tax-advantaged cash at retirement.
Summary: The Optimal FERS Retirement Dates
| Goal | Best Date | |---|---| | Maximize pension start | Last day of any month | | Maximize annual leave payout | December 31 | | Best overall | December 31st | | Runner-up | Last day of any other month |
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