Key Takeaways
- Military service buyback allows eligible federal employees to purchase retirement credit for their prior military service under FERS.
- Success depends on understanding eligibility, deadlines, and accurate completion of the deposit and documentation process.
Many federal employees have the opportunity to enhance their retirement benefits by purchasing credit for time served in the military. To make the most of this option, it’s crucial to clearly understand your eligibility, the buyback deposit procedures, and how credit is applied to your FERS retirement calculation.
What Is Military Service Buyback?
Definition and origins
Military service buyback is a process that allows eligible federal employees to receive credit toward their federal retirement system for prior active-duty military service. Instead of only having civilian service counted toward your annuity under federal retirement programs, you can make a deposit (often called a “buyback”) for your qualifying military time. This option dates back decades, originally created to recognize the value of military service and support veterans’ transitions into civilian federal roles.
Covered federal retirement systems
Military service buyback applies primarily to two federal retirement systems:
- Federal Employees Retirement System (FERS): Most current federal workers are covered under FERS, which combines a pension with Social Security and the Thrift Savings Plan (TSP).
- Civil Service Retirement System (CSRS): This older system covered federal employees hired before 1984; military service buyback also applies here, though CSRS rules differ somewhat from FERS.
In this article, the focus is on FERS, the system that covers the majority of today’s federal workforce.
Who Is Eligible for Buyback?
Types of qualifying military service
Eligibility is determined by the nature of your military service and its relationship to your federal employment. Generally, you may qualify to buy back:
- Active Duty Service: Service performed in any branch of the U.S. Armed Forces that was characterized as active duty.
- Honorable or General Discharge: Only time with an honorable or general discharge is eligible.
- Service Not Already Credited for Federal Retirement: If your military service is already being credited towards a military pension (excluding reservist pensions), it may not be eligible for buyback under FERS.
Other types of service—such as time in the Reserves or National Guard not spent on active duty—usually do not qualify unless it’s credited as “active duty.”
Civilian service and buyback
This buyback option is for federal employees with military service prior to entering or during their civilian federal career. If your federal civilian appointment is covered by FERS or CSRS, and you have military leave from which you returned to your federal job, you will typically be eligible to buy back your service. Civilian service itself is credited differently and does not require a buyback unless you had a break in federal covered employment.
How Does the Deposit Process Work?
Calculating your deposit amount
To buy back your military service, you must make a deposit to your employing agency. The amount you owe is generally a percentage of your basic military pay earned during the period of service. For FERS, the standard calculation is based on 3% of your basic military pay, as outlined in official OPM guidance. Interest accrues if the deposit is not made within three years of starting federal employment, so prompt action can save you money in the long term.
To find the exact deposit required, you can request an estimate by:
- Completing OPM’s SF 3108 (Application to Make Service Credit Payment) and SF 3108A (for military service) forms.
- Obtaining a copy of your DD-214 (Certificate of Release or Discharge from Active Duty) to verify your military time and pay.
- Submitting these forms to your agency’s benefits or human resources office for calculation.
Submitting payment and documentation
Once your deposit amount is determined:
- Submit payment: Agencies typically accept payments via payroll deduction, check, or money order.
- Provide required documentation: Your DD-214 and any other supporting documents must be included to verify your service.
- Retain proof: Always keep copies of all correspondence, payment confirmation, and your agency’s receipt of your deposit.
- Receive confirmation: Once the deposit is processed, request a written receipt from your human resources office showing that your service has been credited under FERS.
How Does Buyback Impact FERS Credit?
How service time is applied
After you complete the buyback process and your payment is posted, your creditable military service time is added to your creditable civilian service for retirement calculation purposes under FERS. This additional time can:
- Increase your total years of service, which raises your FERS annuity calculation
- Potentially improve eligibility for earlier or more generous retirement benefits, depending on your service dates
The Office of Personnel Management (OPM) uses your combined service to determine your annuity computation date and years of service credit at retirement.
Effects on retirement eligibility
For many federal employees, buying back military service can significantly influence when you become eligible to retire and the amount you’ll receive. For example:
- Earlier Eligibility: Adding military time may help you meet minimum years-of-service requirements (such as 30 years at your minimum retirement age under FERS).
- Higher Annuity: Since your annuity is based on your length of creditable service, each bought-back year slightly increases your pension.
Do keep in mind that to benefit, your buyback must be completed before you separate from federal service. The rules strictly require deposits be paid while you’re still a federal employee to receive credit for annuity purposes.
What Are Potential Drawbacks or Pitfalls?
Common misunderstandings
Some common misconceptions around military buyback include:
- Believing all military or guard/reserve time counts, when only active-duty service (with qualifying discharge) is generally eligible
- Assuming your agency automatically credits military service; in fact, you must proactively complete the deposit process
- Thinking you can decide after leaving federal service; you usually cannot buy back time retroactively once retired or separated
Consequences of missing deadlines
Failure to act within the allowable timeframe can have lasting effects. If you wait longer than three years after entering federal service, interest charges on your deposit will increase the cost—with compounding over time. If your buyback is not finalized before your federal separation or retirement date, you will not receive credit towards your annuity, regardless of your eligibility or military record.
Frequently Asked Questions in 2026
Social Security impacts after 2025 changes
As of 2025, the Windfall Elimination Provision (WEP), which once reduced Social Security benefits for many federal employees with both federal and Social Security-covered work, was repealed. This means that buying back your military service for FERS retirement no longer triggers a reduction in your Social Security retirement benefits, assuming your federal position is covered by Social Security. Your earned entitlement under Social Security should be unaffected by military service buyback going forward.
Refunds if buyback is not completed
If you start the buyback process but do not complete your deposit, or separate before the process is finalized, your partial deposit may be refunded through your agency’s payroll process. However, you would not receive retirement credit for your military service under FERS unless the full deposit and required paperwork were completed beforehand. Always check official OPM rules to confirm refund procedures in effect for your situation.
