Key Takeaways
- Military service buyback can significantly enhance retirement benefits under both FERS and CSRS, but rules and impact vary by system.
- Evaluating eligibility, timing, and the change in WEP policy are essential steps for informed retirement planning in 2026.
Did you know that thousands of federal retirees misunderstand military service buyback rules, missing out on additional retirement credit each year? Gaining clarity on these rules can help you maximize the service time that counts toward your federal pension, especially as recent changes affect eligibility and calculation in the current landscape. Here’s what you need to know to confidently navigate the buyback process in 2026.
What Is Military Service Buyback?
Definition and Overview
Military service buyback, sometimes called “making a military deposit,” allows federal employees to apply their periods of active duty military service toward their civilian federal retirement. By making a payment to the federal retirement system, you can have your qualifying military time counted as creditable service, which may increase your annuity and help you meet retirement eligibility sooner.
This process is relevant for employees under both the Federal Employees Retirement System (FERS) and Civil Service Retirement System (CSRS), each with its own set of rules and timelines for crediting service.
Eligibility Criteria
To be eligible for military service buyback, you typically must:
- Have served on active military duty in a branch recognized by the U.S. government (including Army, Navy, Air Force, Marine Corps, and Coast Guard).
- Not already be using that period of service for a military retirement (unless it is based on reservist duty under specific exceptions).
- Have left military service under honorable conditions.
Eligibility guidelines are determined by federal law and Office of Personnel Management (OPM) regulations, ensuring that service time is credited consistently across agencies.
How Does Service Buyback Work Under FERS?
Applicable Rules in 2026
Under FERS, you may buy back your military time by making a deposit equal to a percentage of your military base pay for the period served, plus applicable interest if payment is not made within a certain timeframe after entering civilian service. The rules in 2026 continue to follow OPM guidelines, with the timing of your payment affecting the total deposit required.
Key points include:
- Completing your deposit generally before separating from federal service (ideally within the first three years to minimize interest).
- Credit for military service under FERS will count towards both the years of service needed for retirement eligibility and annuity calculation.
- Most types of active duty service are eligible if not credited toward a military pension (except reserve retirements).
Creditable Military Service Types
FERS recognizes full periods of:
- Active duty performed in the uniformed services (except if used for a military retirement based on active duty alone).
- Certain National Guard time if called to active duty under federal orders.
- Service interrupted by a call to active military duty under USERRA (Uniformed Services Employment and Reemployment Rights Act) may also be counted.
Military service that isn’t creditable toward a military retirement may, in many cases, be bought back for FERS retirement purposes—provided all requirements are met.
How Does Service Buyback Work Under CSRS?
Key Program Requirements
Under CSRS, the service buyback program is similar in concept to FERS, but with distinctions in rules and the effect on your retirement benefit. CSRS employees must make a deposit—typically calculated as a percentage of their basic military pay—plus interest if not paid within a two-year window after joining civil service.
In 2026, making the full deposit (plus any interest accrued) remains necessary to have your military service count both toward eligibility and annuity calculation under CSRS.
Types of Military Service Recognized
CSRS generally credits:
- Active, honorable military service not used for a military retirement (with the same caveat about reserve pensions).
- Eligible service includes federalized National Guard time performed under Title 32 or Title 10 orders, and other classifications officially recognized by OPM.
- Service under USERRA provisions may also be claimable when returning to civilian employment following a call-up.
Each case is unique, so reviewing the exact classification of your service is essential when considering a buyback under CSRS.
What Are the Key Differences?
Crediting Rules Compared
While both systems allow for the buyback of military service, FERS and CSRS differ in how credit is granted:
- FERS requires a deposit for all creditable military service.
- CSRS may provide credit without deposit if you retire at the age threshold and aren’t receiving military retired pay, but a deposit is necessary for full annuity computation in most cases.
Also, under FERS, all eligible military time counts toward both eligibility and your pension calculation if the buyback is completed. CSRS credit can be more restricted if deposits aren’t paid.
Payment Timing and Deadlines
Timing for making a deposit is critical in both systems:
- For FERS, interest on the deposit begins accruing after the first three years of civilian service.
- For CSRS, a two-year window applies. Interest begins accruing if the deposit is not paid within two years of becoming subject to CSRS.
Paying your deposit early generally minimizes total interest owed, whether in FERS or CSRS.
Impact on Annuity Calculation
Buying back military time directly impacts your credited years of service, which are used to calculate your federal annuity. More creditable service typically means:
- Reaching retirement eligibility sooner
- Increasing your retirement annuity
However, the benefit will always depend on your complete service history, the rules in effect at the time, and which system (FERS or CSRS) applies to you.
Is Buying Back Military Time Always Worth It?
Common Considerations in 2026
In 2026, you should weigh several factors before buying back your military service:
- The out-of-pocket cost, including interest if the deposit isn’t made promptly.
- Your anticipated years of civilian federal service and retirement timeline.
- Whether the buyback will advance your retirement date or increase your monthly annuity.
- Recent changes, such as the repeal of the Windfall Elimination Provision, may affect the value proposition—particularly for those combining military, federal, and Social Security benefits.
Potential Drawbacks
Drawbacks of military service buyback may include:
- The initial deposit outlay, which may be significant if delayed.
- Ineligibility if you are receiving a military retirement for the same service period (with some exceptions for reserve retirements).
- The process can be complex, requiring documentation and careful timing.
Understanding these considerations can help you make an informed decision in line with your federal retirement objectives.
