Key Takeaways
- Military service credit can increase your federal retirement benefits under both FERS and CSRS, but the rules and impact differ.
- Understanding deposit requirements and buyback options for 2026 puts you in a better position to maximize your federal annuity.
If you’ve served in the armed forces and are planning for federal retirement, knowing how your military service counts could make a significant difference in your future income. This guide unpacks how FERS, CSRS, and military buyback processes interact, especially as rules and considerations evolve for 2026.
What Are Military Benefits in Federal Retirement?
Military service credit basics
Military service credit is recognition of your active duty military time by the federal retirement system. If your service meets certain requirements, you may be able to count those years or months toward your federal civilian retirement. This can result in a larger pension and possibly earlier eligibility for retirement benefits.
Which federal retirement systems apply?
The two primary federal retirement systems—Civil Service Retirement System (CSRS) and Federal Employees Retirement System (FERS)—each provide a path for military service to be credited. While both systems allow for military service credit, the rules for how it is granted, calculated, and integrated into your pension are different. Understanding which system you’re covered by is the starting point for determining your options.
How Does FERS Treat Military Service?
Eligibility for military service credit
Under FERS, most active duty military service performed after 1956 can potentially be credited if it was served under honorable conditions and isn’t already counted toward a military pension. To receive this credit, you typically need to make a service deposit—sometimes called a military buyback—for your years of uniformed service, unless you are receiving military retired pay based on disability or certain other specific conditions.
Impact on FERS pension calculation
If you make the required deposit, your credited military time will be added to your civilian length of service. This increases the years used to calculate your FERS pension, often leading to a higher annuity. If you choose not to pay the deposit, most post-1956 military service will not count toward your FERS retirement calculation, except in specific rare circumstances.
Considerations for military retirees
If you are already receiving military retired pay, you can only receive credit for your service under FERS if you waive your military retired pay (with some exceptions, such as certain reserve retirements or disability pay granted under specific laws). This choice requires careful consideration, as waiving military retired pay is a serious and often irreversible decision.
How Does CSRS Handle Military Service?
CSRS service credit rules
CSRS, the predecessor to FERS, also allows certain military service to be counted toward your civilian retirement, provided the service was honorable and is not already counted toward a military pension (with some specific exceptions). Like FERS, a deposit may be required to receive credit for active duty performed after 1956.
Differences for pre- and post-1957 service
A key distinction under CSRS is the treatment of military service performed before and after 1957:
- Pre-1957 military service: Automatically counts toward CSRS retirement without a deposit.
- Post-1956 service: A deposit must be made for full credit in both your annuity calculation and to avoid any reduction at age 62 if you qualify for Social Security.
Military retired pay and CSRS
If you are in receipt of military retired pay, you generally must waive it to receive credit under CSRS. The rules mirror those in FERS, with limited exceptions based on specific types of military disability retirement or reservist pay.
What Is the Military Buyback Process?
Understanding military service deposit
The military buyback process involves making a service deposit to have your military time credited toward your federal retirement. This payment is calculated as a percentage of your military base pay earned during your service. Deposits are typically interest-free if made within a set window early in your civilian career; otherwise, interest is charged.
Required documents and forms
To initiate the buyback process, you’ll need to:
- Obtain your DD Form 214 (to prove service and nature of discharge)
- Request a military earnings statement from your branch or DFAS
- Complete the appropriate service deposit application (often Standard Form 3108 for FERS or Standard Form 2803 for CSRS)
- Submit these to your agency’s human resources office
The process may take several months, especially for earnings verification.
Effect on final retirement annuity
Once your deposit is paid and your service is credited, your military years are added to your total federal service for retirement calculation purposes. This typically results in a higher annuity. While making a deposit enhances your benefits, the timing and cost of the deposit can impact your decision.
Key Differences: FERS vs. CSRS vs. Buyback
Comparison of eligibility and credit
- FERS and CSRS: Both programs allow credit for active duty military time that isn’t being used toward military retired pay (with limited exceptions), pending deposit requirements.
- Buyback: The buyback process is the vehicle for making prior military time count in your final pension calculation under either system.
Pension calculation impacts
Bringing military service into your federal retirement through a buyback can increase the number of years in your pension formula. Since FERS and CSRS use different multipliers and eligibility ages, the increase in monthly annuity will differ between the systems. For many, it can move you to earlier eligibility or boost the final pension.
Long-term benefit considerations
Consider both the current cost of making a deposit and the potential long-term benefit increase. Factors like your covered retirement system, anticipated length of civilian service, and whether you’re receiving (or plan to receive) military retired pay should all play a role.
How Does Military Buyback Affect Social Security?
Social Security and federal service credit
Military service often earns Social Security credits as well as time toward your federal retirement. Under FERS, both federal and military service can count toward Social Security eligibility and benefit calculation. For CSRS, a deposit is required for post-1956 service to avoid potential reductions in your CSRS annuity at age 62 if also eligible for Social Security.
Interactions with military retirement pay
Receiving military retired pay, in most cases, doesn’t prevent you from receiving Social Security. But if you want military service to count toward your federal pension, you usually must waive the retired pay (with specific exceptions noted previously). This decision has distinct effects on both your federal annuity and Social Security.
Should You Combine Military and Federal Service?
Potential advantages of service credit
Combining your military and civilian federal service can increase your total years of creditable service. This may make you eligible for retirement earlier and can boost your monthly pension amount. Making a deposit for your military service time is often the only way to achieve this combination under either FERS or CSRS.
Factors to consider before making a deposit
Some factors to weigh include:
- Your retirement system and the specific rules in effect
- Whether you’re eligible for or already receiving military retired pay
- The cost and timing of the deposit, including interest if applicable
- How the added service affects your overall annuity and benefit eligibility
Can Military Disability Benefits Be Included?
What federal rules allow
Military disability retirement is treated differently from standard military retired pay. Generally, if your retired pay is awarded based on a service-connected disability (and not for years of service), certain credit toward federal retirement may be possible. Each case needs to be checked against federal rules and your actual benefit awards.
Difference between disability and eligible credit
Military disability pay does not automatically translate to service credit for federal retirement. Eligibility depends on the specific source and type of pay. It’s vital to distinguish between disability pay and regular military service that qualifies for buyback and deposit credit.
