Buying Back Military Time: A 2026 Federal Guide
You've just started a federal job, opened your benefits portal, and discovered that your military years may be useful again. You have a DD-214 somewhere, but you don't know what your service is worth, how much the deposit will cost, or whether waiting a few years will materially change the decision.
Buying back military time can turn qualifying military service into credit toward a federal retirement under FERS or CSRS. The opportunity is valuable, but the paperwork, interest rules, military retirement issues, and separation deadlines matter. The right decision starts with the actual mechanics, not a generic instruction to “do it early.”
What Buying Back Military Time Actually Means
Suppose you served eight years on active duty and have just accepted a federal position covered by FERS. Buying back that military time means making a required deposit so those qualifying years can be credited toward your federal civilian retirement. The governing rules are described in OPM's service credit guidance.
The deposit can affect two separate parts of retirement planning:
- Eligibility credit: The military years can help you reach a federal retirement service threshold sooner.
- Annuity credit: The bought-back years can be included in the service used to calculate your federal annuity.
Those outcomes are related, but they aren't the same. A person may already qualify for a particular retirement option without the military credit, yet still benefit because the additional service increases the annuity calculation. Another employee may value the credit primarily because it brings a retirement date closer.
The deposit is the mechanism
For FERS employees with post-1956 military service, OPM states that the standard deposit is 3% of military basic pay. If the deposit isn't paid, the military service generally won't count in the FERS annuity computation. Service from 1999 and 2000 had temporary rates of 3.25% and 3.4%, respectively, before the standard rate returned to 3% for service from January 1, 2001 onward. Those historical rules are summarized in OPM's FERS service credit material.
That means the government isn't “adding” your active-duty years just because you're a veteran. You're purchasing credit under a rules-based deposit system. Your agency's benefits office uses military earnings information to determine the amount owed.
Don't confuse military pay with VA compensation
Military retired pay creates a separate issue from VA disability compensation. If you're already receiving a military retirement based on career service, using those same years for civilian retirement may involve a waiver of military retired pay. That decision requires a direct comparison of the benefit you'd give up with the civilian annuity increase you'd receive.
The fact that someone receives VA disability compensation doesn't, by itself, answer the buyback question. Treat the military pension, VA compensation, and FERS annuity as separate benefit streams, then test whether the same service years can legally support each one.
Practical rule: Don't authorize a waiver or send a final payment until you know exactly which military benefit is affected and which years the deposit will credit.
Calculating Your Military Service Deposit Cost
For a FERS employee, the basic calculation is straightforward:
Total military basic pay × applicable deposit rate = base deposit.
The rate applies to military basic pay, not a general estimate of your total compensation. Your official earnings record is what matters, so don't rely on rank-based guesses when you're making a retirement decision.
A worker whose cumulative military basic pay was $180,000 would have a base FERS deposit of $5,400, because the standard FERS rate is 3%. A CSRS employee with the same basic-pay history would have a base deposit of $12,600, using the standard 7% CSRS rate. CSRS had temporary rates of 7.25% in 1999 and 7.4% in 2000, then returned to 7% from January 1, 2001 onward, according to OPM's 2026 deposit guidance.
FERS and CSRS at a glance
| Factor | FERS | CSRS |
|---|---|---|
| Standard deposit rate | 3% of military basic pay | 7% of military basic pay |
| 1999 temporary rate | 3.25% | 7.25% |
| 2000 temporary rate | 3.4% | 7.4% |
| Standard rate from January 1, 2001 onward | 3% | 7% |
| Interest treatment | Interest applies after the applicable early service window | Rules differ, confirm with HR |
| If unpaid | Military service generally won't count toward the FERS annuity computation | Credit can be affected under CSRS rules |
For a deeper look at how the service credit interacts with the rest of a FERS retirement calculation, use this FERS retirement calculator guide.
Interest changes the decision
The base deposit is only the starting point. For FERS, OPM explains that interest accrues on an unpaid deposit after the early civilian-service period. The 2026 Treasury interest rate is 4.25%, and the unpaid balance can grow through annual compounding, as described in OPM's 2026 Benefits Administration Letter.
Using the required planning example, a $5,400 base deposit can grow to approximately:
- $7,200 after five years
- $9,600 after ten years
- $12,800 after fifteen years
These figures illustrate the economic direction of delay. They aren't a substitute for the official calculation because the applicable interest treatment and payment history must be confirmed by your agency.
The important distinction is that waiting doesn't create more retirement credit. It can make you pay more for the same credited military service. That's why a newly hired employee should request the estimate immediately, even if paying the full amount requires additional planning.
Gathering Required Documents and Completing Forms
A missing DD-214 or incomplete earnings record can delay the deposit calculation for months. Build your file before asking HR to process the request. That approach gives you a faster cost estimate and shows how much delay could add to the final bill.
Assemble the service records
Gather these records:
- DD-214: The Certificate of Release or Discharge from Active Duty identifies the military service that may qualify.
- Military earnings statement: DFAS uses military pay records to establish the basic pay used for the deposit calculation.
- Retirement system application: FERS employees use SF-3108, while CSRS employees use SF-2803.
- Service computation information: Your civilian personnel records help HR place the proposed credit within your federal service history.
Missing the DD-214? Request it through the National Personnel Records Center. If military earnings documentation is unavailable, contact DFAS and request the pay information needed for a service deposit calculation.
Ask your agency's HR or benefits office to handle the civilian-service review. Do not send a completed package directly to OPM unless your agency gives you that instruction.
Follow the agency process
Submit the applicable form and supporting records to your agency HR office. HR reviews the file, coordinates the earnings calculation, determines the deposit amount, and provides payment instructions. The balance may include interest if the early payment window has passed, which makes prompt submission part of the financial decision, not just an administrative task.
Processing can take two to four months because several administrative steps may be required. If HR does not respond, follow up in writing. Ask whether the request is logged, whether a document is missing, and which office or employee owns the next action.
Reviewing the SF-50 guide for federal employees can help you identify the civilian personnel records HR may use to verify your service history.
Keep proof of every step
Maintain a permanent personal file containing:
- Your DD-214 and related military records.
- The submitted application and earnings documentation.
- HR's deposit calculation.
- Payment confirmations and receipts.
- Written confirmation that the deposit is complete.
After payment, ask HR to confirm that the deposit is recorded as paid in full and that the service credit appears in your retirement record. A payroll deduction or cleared check does not, by itself, prove that the retirement record is complete.
The video below provides another visual explanation of the paperwork process:
The Timing Decision and Interest Cost Reality
Current guidance from OPM frames the deposit window narrowly, but the interest impact extends well beyond the first year. The right question is not whether to act early. Compare the cost of paying now with the cost of waiting, then test both against the retirement income the credit could produce.
For FERS, OPM's 2026 interest rate is 4.25%, as noted above, and interest accrues on an unpaid military deposit after the applicable early civilian-service period. Each additional period of unpaid balance raises the final cost above the original percentage-based deposit. Waiting can therefore reduce the value of the credit even when your eventual retirement calculation remains the same.
Use break-even, not instinct
Start with this calculation:
Final deposit cost ÷ additional annual annuity = approximate years to recover the deposit.
The deposit estimate is only half the analysis. The additional annuity depends on your credited military service, future high-three salary, retirement timing, and the formula that applies to you. Salary growth can increase the value of the credited years. Leaving federal service sooner can reduce the practical payoff.
A large deposit may still be reasonable if it creates a meaningful lifelong annuity increase. A smaller deposit may still be a poor choice if you expect to leave federal service before qualifying for a retirement benefit that uses the military credit.
An eight-year federal employee
At eight years into federal service, waiting has a measurable cost, but it is not automatically too late. Request the official deposit calculation, then compare today's balance with the projected annuity increase and the time you expect to remain in federal service.
Ask four direct questions:
- Will the credit change your retirement eligibility date? If so, its value includes the option to leave earlier, not only a larger annuity.
- Will you remain long enough to receive the additional benefit? A short federal career can weaken the break-even case.
- Can you pay without damaging essential reserves? A retirement credit should not create a serious cash-flow problem.
- Does a military retired-pay waiver apply? Compare the complete benefit packages, including any military income you would give up, rather than viewing the FERS increase alone.
Build two written projections, one with the deposit and one without it. Show how each changes if retirement occurs later, salary rises, or federal employment ends earlier than expected. Include the growing interest balance in the waiting scenario.
Waiting is rational only when the alternative use of your money is stronger than the retirement credit you are giving up. “I'll deal with it later” is not an analysis.
Military service can also affect broader retirement planning after disciplinary proceedings or a court-martial. If that applies to you, review protect retirement after court-martial before treating the deposit as your only retirement concern.
Weighing the Pros and Cons for Your Situation
The best decision depends on your service history, federal career plans, retirement system, and access to a military pension. Buying back military time is often attractive for a veteran who expects a long civilian federal career and has no military longevity pension to protect. It's less compelling when the deposit is large, federal service may end soon, or the military retirement waiver would sacrifice a valuable income stream.
Scenario one, a new hire with four years
A new federal employee with four years of military service, no military longevity pension, and a clear intention to build a federal career is usually the strongest candidate. The deposit is based on the applicable military basic pay, and completing the process during the early window avoids the interest problem described above.
The benefit can have two layers. The service may help the employee meet retirement eligibility sooner, and it can increase the annuity calculation. If the employee expects decades of federal service, the credit has more time to influence the final retirement plan.
Recommendation: Request the earnings estimate immediately, complete the application, and prioritize paying the deposit before interest applies.
Scenario two, a mid-career employee twelve years in
An employee twelve years into federal service needs actual numbers. The opportunity may still be valuable, but the deposit may now include substantial interest, and the employee has fewer years to make a deliberate choice before separation or retirement.
A comparison table helps. Put the official deposit cost beside the expected annuity increase, then test retirement at several plausible dates. Include the value of earlier eligibility if the military credit changes when you can leave.
Recommendation: Don't reject the buyback because the cost is higher, and don't approve it because a general rule says veterans should buy back. Calculate the break-even period and verify that you'll remain eligible to use the credit.
For a structured way to compare alternatives, you can explain comparative analysis method before applying it to your retirement scenarios.
Scenario three, leaving federal service in five years
Someone planning to leave federal service in five years should be cautious. If the employee won't remain in federal employment long enough to use the service credit in the intended retirement benefit, the deposit may not deliver the expected value.
That doesn't mean the answer is always no. The employee should verify whether the planned separation preserves a future federal annuity and whether the military credit will be available under that benefit. The practical question is not “Will the years count?” It's “Will those years produce a benefit I can collect under my expected career path?”
Recommendation: Delay payment only while obtaining a formal analysis. If the projected federal benefit is weak or uncertain, keeping the money available may be the better choice.
Use a side-by-side pension estimate, such as this guide on calculating pension benefits, and document the assumptions behind every result.
Special Cases and Edge Scenarios
Some employees make the wrong decision because they treat buying back military time as a simple transaction. It isn't. Disability retirement, military retired pay, separation, and payment timing can change the outcome.
Disability retirement requires separate modeling
Buying back military time can increase a regular federal retirement annuity, but the credit can operate differently when an employee retires on federal disability and the annuity is later recomputed at age 62. A buyback decision should therefore be tested against both a regular-retirement scenario and a disability-retirement scenario.
The issue is especially important if you're considering disability retirement, postponing separation, or expecting a later change in retirement status. Review the interaction before paying, rather than assuming the credit will affect every future benefit in the same way. A discussion of this issue appears in the federal disability retirement FAQ.
Military retired pay can change the trade-off
If you receive military retired pay, determine whether the service deposit requires a waiver of that pay. The answer can be materially different for someone with an active-duty longevity retirement than for someone with qualifying Reserve or National Guard retirement circumstances.
Don't compare the deposit only with the projected FERS increase. Compare the full income streams, survivor considerations, and the effect of any waiver before committing.
Separation is the hard deadline
DFAS states that the military service credit process must be completed before separation, and DFAS military service deposit guidance emphasizes starting well before retirement. Processing can take months, so beginning the paperwork near your final separation date creates avoidable risk.
Payment may be made as a lump sum or through an approved installment arrangement, subject to agency instructions. The deposit itself isn't a routine tax deduction from your current income, so ask a qualified tax professional how the payment affects your overall retirement tax basis and future annuity taxation.
Federal Benefits Sherpa offers personalized federal benefit reviews, retirement planning, and gap analysis to help employees evaluate military service deposits alongside their pension, TSP, healthcare, and Social Security decisions. Visit Federal Benefits Sherpa to request a benefit review and turn your service records into a clear buyback decision.
