You put in 20 years. You retired. Now a military pension hits your bank account every month. Then you land a federal job, and someone in HR says the word "buyback." They tell you that you can buy back your active-duty time and count it toward your federal pension too.

Sounds like a no-brainer. More credited years means a bigger federal annuity. But there is a catch that most people never hear until it is too late. For a lot of retirees, buying back your time means giving up the military pension you already earned.

By the end of this article, you will know exactly how a military buyback works when you already draw a pension. You will know the one rule that decides whether it is worth it, and the two exceptions that change the whole math. No guessing. This is a decision you want to get right the first time.

What Is a Military Buyback, in Plain Terms?

A military buyback is a payment you make to get your active-duty time counted toward your federal civilian retirement. The official name is a military service credit deposit. Most people just call it a buyback or a military deposit.

Here is the basic idea. When you take a federal job, you fall under the Federal Employees Retirement System, or FERS. Your FERS pension is based on your years of federal service and your high-3 average salary. Your active-duty years do not count toward that pension on their own. You have to pay for them.

Under FERS, the deposit is 3% of the military basic pay you earned during your active-duty service, plus interest. This is spelled out by the Office of Personnel Management. Pay that deposit, and your active-duty years get added to your FERS service. That can raise your annual pension and help you reach retirement eligibility sooner.

One thing to know up front. Under FERS, if you do not pay the deposit, your military time simply does not count toward your civilian pension at all. It is a straight pay-or-it-does-not-count system. There is no partial credit.

Do I Lose My Military Pension If I Buy Back My Time?

This is the question that matters most for a retiree. And the honest answer is: usually, yes.

The rule from OPM is direct. To get credit for your post-1956 military service under FERS, you must waive your military retired pay. You cannot count the same years for both a military pension and a federal pension. The government does not let you get paid twice for the same service.

So a standard 20-year active-duty retiree faces a real trade. Keep the military pension you already earned, or waive it to fold those years into your FERS pension. For most people in this spot, that is a bad deal. Your military pension is almost always worth far more than the extra FERS credit those years would buy.

Think about it in real numbers. A 20-year active-duty retirement can pay tens of thousands of dollars a year for the rest of your life. Adding those same 20 years bumps your FERS multiplier. But it rarely comes close to matching a full military pension. Waiving the pension to buy back the time would leave most retirees worse off.

The Two Exceptions That Change Everything

There are two cases where you do not have to waive your military retired pay. This is the part that decides whether a buyback is smart or foolish. According to OPM's rules on military retired pay, the waiver is not required if your retired pay was awarded:

• For a service-connected disability incurred in combat with an enemy of the United States. Or one caused by an instrumentality of war during a period of war.
• Under Chapter 1223 of Title 10, which is the reserve retirement provision. This is the non-regular retirement that Guard and Reserve members earn, usually paid starting around age 60.

If you fall into either group, you keep your military pension and you get FERS credit for buying back the time. That is the best-case scenario. You are getting paid for those years twice, and it is completely legal.

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When Does a Buyback Actually Make Sense for a Retiree?

Not everyone should walk away from a buyback. There are a few situations where it is a strong move, and some where it is the obvious call.

The Reserve and Guard case is the one worth stopping on. Say you did 22 good years in the Reserve. Your reserve pension is set to start around age 60, based on your points. Now you are working a federal job under FERS. Buy back your active-duty and active-duty-for-training time, and you get FERS credit for it. You still collect that reserve pension later. That is real money you leave on the table if you skip it.

The same logic applies if you served a few years, got out, and never hit 20. You have no military pension to protect. Paying a small 3% deposit to add those years to your federal pension is one of the better returns you will find in federal benefits. If you want the fuller picture on rolling early service into a federal career, our guide on getting a federal job years after separation covers how those years fit together.

A Reserve Retiree Example: Two Checks, One Deposit

Numbers make this clearer. Under FERS, each year of credited service adds 1% of your high-3 salary to your yearly pension. That climbs to 1.1% per year if you retire at age 62 or older with at least 20 years of service. So credited years pay you back for the rest of your life.

Say a Guard retiree buys back 5 years of active-duty time. The deposit is 3% of the basic pay from those 5 years. On junior-enlisted pay, that can land in the low thousands of dollars. In return, those 5 years get added to the FERS formula every year you draw the pension. And because reserve retirement falls under Chapter 1223, the reserve pension still starts at age 60 no matter what.

That is two pensions built off one small deposit. For a reserve or Guard retiree, skipping the buyback is usually leaving guaranteed money on the table.

When Is a Buyback Not Worth It?

For a regular 20-year active-duty retiree who is already collecting a pension, the buyback usually does not pay off. The reason is simple. You would have to waive a pension worth tens of thousands a year to gain a much smaller boost to your FERS annuity.

Run the two paths side by side before you decide. Path one: keep your military pension and earn a FERS pension on your federal years only. Path two: waive your military pension, buy back the time, and earn a single larger FERS pension. In almost every case, path one puts more total money in your pocket over a lifetime.

There are edge cases. If your high-3 federal salary is very high and you plan to work federal service for many years, the FERS multiplier on the combined time can grow. But you are still walking away from a guaranteed lifetime military check. That is a heavy price. This is the kind of call you should model with your agency benefits officer, not eyeball.

How Much Does the Buyback Cost and When Do I Pay?

The FERS deposit is 3% of the basic pay you earned on active duty. Note that this is basic pay only. It does not include your allowances like BAH or BAS, and it does not include special or incentive pays. So the deposit is often smaller than people expect.

Interest is where timing matters. Your deposit does not build interest right away. There is a grace period after you are first hired under FERS. OPM sets an interest accrual date for your account. After that date, interest compounds each year on the unpaid balance. The exact rate changes annually and is set by OPM. Because interest keeps climbing the longer you wait, paying earlier in your federal career costs you less.

The hard deadline is this: you must pay the deposit in full before you separate from federal service. If you retire from your federal job without completing the deposit, you lose the chance to get that credit. You pay the deposit to your employing agency while you are still working, not to OPM after you leave.

How Do I Actually Start the Buyback?

The process has a clear order. You do not have to figure the numbers out yourself. Your agency and your branch of service do the heavy math. Your job is to start the paperwork and then make the call.

The election paperwork is the OPM Form 1515, Military Service Deposit Election. Your HR office handles the filing, but it helps to know the form by name so you can ask for it directly. Keep copies of everything. Deposit records have a way of getting lost between an agency and OPM years down the road.

What to Do Next

Start with the one question that settles most of this. Do you draw a military pension, and if so, is it a regular active-duty retirement or a reserve or combat-disability retirement? A reserve or combat-disability retiree usually buys back with no downside. A regular active-duty retiree usually should not touch it. A veteran with no pension almost always should.

I have been hired into six different federal career fields since the Navy. Environmental Management. Supply. Logistics. Property Management. Engineering. Contracting. The buyback question came up more than once, and the answer was never the same twice. Your service history drives the whole decision, so do not copy someone else's call.

None of this matters until you land the federal job in the first place. That is the hard part, and it is the part a strong federal resume solves. BMR's Federal Resume Builder turns your service record into a two-page federal resume built the way the selecting official reads it. Built by veterans who have sat on the hiring side of the desk. Once you are in the door, the benefits office can run your buyback numbers. If you are weighing a federal career as a retiree, our guide on federal jobs after military retirement and the dual-comp rules is a good next read.