This Hidden Rule Lets Civilian DoD Employees Count Military Time Toward Retirement

Key Takeaways

• Civilian Department of Defense (DoD) employees can buy back prior active-duty military service time to enhance their federal retirement benefits under FERS or CSRS.

• You must take action before retirement—delays or missed deadlines can permanently reduce your pension.

What the Military Buyback Program Is—and Why It Matters Now

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If you’re a civilian DoD employee with prior active-duty military service, you might qualify to count that time toward your federal retirement. This opportunity comes through a little-known benefit called the military service credit deposit—often called the “military buyback” program. In 2025, the rules remain unchanged, but far too many employees miss out simply because they don’t know the option exists or how to act on it.

Buying back your military time allows you to increase your years of creditable service under the Federal Employees Retirement System (FERS) or Civil Service Retirement System (CSRS). That means you can retire earlier or receive a larger pension—sometimes significantly larger.

Eligibility Basics: Who Can Use This Rule

To be eligible to buy back military time, you must:

• Be employed in a covered civilian federal position.

• Have completed honorable active-duty military service.

• Not already be using that military service to qualify for a military pension (with certain exceptions).

Reserve service and National Guard time typically do not count unless it involved active-duty orders.

You Must Make a Deposit

Buying back military time is not automatic. You need to make a service credit deposit to your agency’s payroll office. This deposit equals 3% of your military basic pay earned during your time in service—plus accrued interest, if you delay.

For CSRS employees, the rate is 7%, and the rules vary more. But since the majority of current federal workers are under FERS, the 3% figure is the most common benchmark.

How Much Time Can Be Credited?

You can buy back any amount of active-duty service performed before joining the federal civilian workforce, as long as it was:

• Honorable

• Not already credited toward a military retirement

There’s no upper limit on the amount of time you can buy back. Whether you served two years or twenty, that time can potentially count toward both your FERS pension calculation and your eligibility for retirement.

Why the Deadline Matters So Much

Timing is everything. If you wait until after retirement to consider a military buyback, you’re out of luck. In 2025, this rule is still strictly enforced.

Here’s what you must know:

• Your deposit must be paid in full before your retirement date.

• The longer you wait, the more interest you’ll owe on the deposit.

• Once you retire, the option disappears forever.

If you plan to retire in 2026 or beyond, now is the time to calculate your buyback amount and get the process started. Delays can cost you thousands over the course of your retirement.

The Impact on Your Retirement Eligibility

Buying back military time can help you meet the eligibility requirements for:

• Voluntary retirement (usually age 60 with 20 years or age 62 with 5 years)

• Early retirement under MRA+10 (Minimum Retirement Age with at least 10 years of service)

• Immediate annuity for special category jobs like law enforcement or air traffic control, where early retirement rules apply

For example, if you served four years of active-duty service and buy back that time, it gets added to your civilian service. If you otherwise had 16 years as a federal employee, your total would rise to 20—unlocking new retirement options.

The Impact on Your Annuity Calculation

Under FERS, your pension is calculated using this formula:

• 1% of your high-3 average salary × years of creditable service

• 1.1% if you retire at age 62 or later with at least 20 years

So, if your high-3 salary average is $90,000 and you have 20 years (thanks to a 5-year buyback), you’d receive:

• 90,000 × 1% × 20 = $18,000 annually

If you didn’t buy back that time and only had 15 years:

• 90,000 × 1% × 15 = $13,500 annually

That’s a $4,500 yearly difference, every year, for the rest of your life.

How to Start the Military Buyback Process

It’s a multi-step process, and it takes time—so don’t wait. Here’s how to begin:

1. Request your military records. Use Standard Form 180 (SF-180) to request your DD-214 and earnings statement.

2. Estimate your deposit. Your HR office or an online estimator tool can help.

3. Submit your application. This usually involves SF-3108 (for FERS) or SF-2803 (for CSRS).

4. Pay the deposit. You can pay in a lump sum or through payroll deduction, but the full amount must be paid before retirement.

5. Obtain a confirmation. Once the payment is complete, get written confirmation that your service credit was approved.

What About Retired Military Members?

If you’re receiving a military pension based on your service, you generally cannot buy that time back for civilian retirement purposes. But there are limited exceptions:

• If you’re receiving VA disability compensation but not military retired pay, you may still be eligible.

• If you waive your military pension (a rare but possible choice), you can use that time toward FERS.

Most people do not waive their military retirement unless the FERS benefit would be significantly more valuable.

Interest Accrual: Why Waiting Costs You More

Interest starts accruing after 3 years of federal civilian service. So if you joined DoD in 2020, you’d begin accruing interest in 2023. That interest is compounded annually at variable rates set by the Treasury.

In 2025, some employees are paying thousands in interest simply because they waited too long to begin the buyback process.

Special Considerations for CSRS Employees

Although most civilian employees today are under FERS, a few are still covered by CSRS. The buyback rules differ slightly:

• CSRS deposit rate is 7% of military base pay.

• Failure to pay may result in a reduced annuity, not complete loss of credit.

• Interest accrues sooner and compounds annually.

If you’re under CSRS, talk to your HR or a licensed professional right away—your strategy could differ.

Important Forms and Agencies

You’ll work with multiple offices during the buyback process. These are the key players:

• HR Office – Initiates paperwork, provides guidance, submits forms

• Military Finance Center – Supplies earnings statements

• Payroll Office – Processes deposits and deductions

• OPM – Final authority on service credit at retirement

Start early so each office has time to complete its part before your retirement date.

Get This Right Before It’s Too Late

Your military time has value—but only if you take the steps to buy it back while you’re still employed. In 2025, the process is clearer than ever, yet thousands still miss the opportunity.

By boosting your service years, you can enhance your annuity, retire earlier, and lock in benefits you already earned through your military service. Every delay increases interest and risks.

Speak to a Professional Who Understands This

To make the most of the military buyback rule, get in touch with a licensed professional listed on this website. They can walk you through timelines, paperwork, and help you avoid irreversible mistakes.