Key Takeaways
- FERS service credit buyback can increase your pension but is not mandatory for all federal employees.
- New rules in 2026 emphasize accurate records and key deadlines, making it vital to understand your options before buying back service.
For federal employees, the option to buy back prior service under the Federal Employees Retirement System (FERS) can significantly affect retirement income. As new regulations take effect in 2026, accurate information is more important than ever. This article clarifies how the FERS buyback works, recent rule changes, and what you should know before making a decision.
What Is a FERS Retirement Buyback?
Definition and Purpose
A FERS retirement buyback allows eligible federal employees to make a deposit for periods of service that were not originally covered by retirement contributions. The main purpose is to include those service periods—such as prior military time or certain temporary federal work—when calculating your total creditable service. This deposit isn’t a “purchase” in the conventional sense, but a way to have previously non-deducted service counted toward your retirement calculations.
Who Is Eligible Under FERS?
In 2026, eligibility for FERS buyback remains tied to specific criteria. You may be able to buy back time if you:
- Have prior federal service that was not covered or only partially covered by FERS contributions
- Completed federal civilian service under temporary appointments or part-time schedules
- Have military service performed before retirement that can be credited (certain conditions apply)
Keep in mind, not all prior service qualifies. For example, service that resulted in a refunded retirement contribution or service already credited in another federal retirement system may not be eligible.
How Does the Buyback Process Work?
Calculating Buyback Service Credit
When you consider buying back prior service, the first step is to determine how much time is potentially creditable and how much a deposit would cost. Deposits are generally calculated as a percentage of your basic pay during the relevant period, plus interest. The official Office of Personnel Management (OPM) website and your agency’s human resources office provide calculators and worksheets to help estimate these costs.
Required Forms and Timing
To initiate a buyback, you’ll need to complete specific forms—typically OPM Form 1515 for civilian service and SF 3108 for certain deposit or redeposit situations. The submission process requires proof of service, earnings statements, and in some cases, a review of prior military records. It’s crucial to begin this process well before retirement since processing times can vary and documentation issues could delay your pension accrual.
What Rules Changed by 2026?
Recent Legislative Updates
By 2026, federal retirement regulations have evolved to streamline the buyback process. Recent updates focused on clarifying eligibility standards, formalizing processing timelines, and introducing more digital access for records and payment confirmations. Notably, changes in military service buyback rules have improved alignment between federal and military recordkeeping.
The repeal of the Windfall Elimination Provision (WEP) in 2025 has also removed previous concerns for FERS participants about potential reductions in Social Security benefits due to buybacks.
Key Dates and Deadlines
Current rules underscore the importance of meeting key deadlines. Missing the window to submit your application or fulfill a deposit can result in higher costs due to accrued interest or even ineligibility for service credit. Be aware of the following:
- Some types of service must be bought back before separation from federal service
- Deadlines may differ for civilian and military buybacks
- Late deposits can accrue interest, increasing the total you need to pay
Does Buyback Increase Your Pension?
Pension Calculation Basics
Your FERS pension is generally based on a formula that considers your highest three consecutive years of pay (your “high-3”), total creditable service, and a multiplier set by regulations. Only federal service officially credited to your record counts for this calculation.
Impact of Added Service Credit
Buying back eligible service typically adds to your total years of creditable service, which can directly increase your monthly pension amount. For example, if you buy back two years of military service, your pension calculation will include those two extra years. However, the actual impact depends on your unique pay and service history.
Adding service credit may also help you qualify for earlier retirement eligibility or enhance survivor benefits. It’s important to compare the potential long-term benefit of a higher pension against the up-front and long-term cost of making a buyback deposit.
Common Myths About FERS Buyback
Myth: Buyback Is Always Mandatory
One persistent myth is that all federal employees must buy back eligible service to maximize their FERS pension. In reality, buyback is entirely optional. The rules provide the choice, not a requirement, to make a deposit for qualifying service. It’s your decision, based on whether the cost justifies the difference in your future benefits.
Myth: All Service Qualifies
Another misunderstanding is that all prior federal or military service can be bought back. Some service periods—such as those already credited by another retirement system or for which you received a refunded contribution—might not be eligible. Double-check documentation and consult official resources to verify your specific service credit options.
What Should You Consider Before a Buyback?
Weighing Costs Versus Benefits
Before proceeding, weigh the financial cost of a buyback deposit against your projected increase in annual pension payments. Paying the deposit may be worthwhile if you expect to live many years in retirement, but you should also account for interest costs on late payments.
Unforeseen Impacts on Other Benefits
It’s also wise to consider any potential impact on other retirement or survivor benefits, especially if you’ve served in multiple federal systems or have complex service histories. The 2026 rules clarify that buybacks do not affect your Social Security—thanks to the 2025 repeal of the Windfall Elimination Provision—but they may interact with other federal pension factors.
