You already know the rule. To count your active-duty years toward a federal pension, a military retiree usually has to waive the military pension they already earned. We covered exactly how that works in our guide on how a military buyback works for retirees.

This article is the next question. Should you actually do it? You are sitting in HR. The buyback paperwork is in front of you. Someone says you can fold your 20 years into FERS. It sounds like free money. It is not always a good trade, and for a lot of retirees it is a bad one.

By the end of this, you will be able to run the tradeoff on your own numbers. You will know which of three buckets you fall into. And you will know the one comparison that decides the whole thing. No guessing. This is a permanent choice, so it is worth getting right the first time.

What Are You Actually Trading When You Waive?

Strip away the jargon and the choice is simple. You are trading one lifetime check for a bigger version of a different lifetime check.

Keep your military pension, and you draw two separate streams in retirement. Your military retired pay, plus a FERS pension built only on your federal years. Waive it, and you give up the military check. In return, your bought-back active-duty years get folded into FERS, which makes that one pension larger.

So the real question is never "do I want more FERS credit." Of course more credit sounds good. The question is whether the FERS boost from those years is worth more than the military pension you would surrender to get it. That is a dollars-for-dollars fight, and you can measure it.

How Do You Run the Break-Even Math on Your Own Numbers?

You do not need a spreadsheet full of formulas. You need two numbers, side by side. What the military pension pays you per year, and what those same years are worth inside FERS.

Start with the FERS side. Each year of credited service adds 1% of your high-3 federal salary to your yearly FERS pension. That rises to 1.1% per year if you retire at age 62 or older with at least 20 years of service. Those percentages come straight from the OPM annuity computation rules. So the FERS value of buying back your active-duty time is easy to figure.

Try it with round, illustrative numbers. Say you served 20 years on active duty. Your high-3 federal salary is $90,000. Fold those 20 years into FERS at 1% each, and you add 20% of $90,000. That is $18,000 more per year in FERS pension, for life.

Now the military side. Say your 20-year active-duty retirement pays about $30,000 a year. That is the check you would give up to gain the $18,000 FERS boost. In this example, you would surrender $30,000 a year to add $18,000 a year. You would be down $12,000 every year for the rest of your life.

Two things make the real math a little softer than my clean example. Your military pension gets a yearly cost-of-living raise, so it grows over time. And the two figures sit on different base salaries. Your military pension is built on your military base pay. Your FERS pension is built on your high-3 federal salary, which is usually higher. So plug in your own numbers, not mine. But the shape of the answer rarely changes.

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Why It Almost Never Works for a 20-Year Active Retiree

There is a deeper reason the math breaks the same way for most active-duty retirees. It comes down to the multipliers.

A 20-year active-duty pension replaces a big slice of your base pay for life. That is roughly 40% to 50% of your base pay average. It depends on whether you fall under the legacy High-3 system or the newer Blended Retirement System. Now compare that to what those same 20 years buy inside FERS. At 1% per year, 20 years adds 20% of your high-3. Even at the 1.1% rate, it is 22%.

So the years you served are worth about twice as much as a military pension than as FERS credit. That is the core reason waiving is usually a losing move for an active retiree. You are converting years priced at 2% or 2.5% each down to 1% each. The base salaries differ, so it is not a perfect head-to-head. But the gap is wide enough that it holds up in most real cases.

The edge cases exist, and they are real. If your high-3 federal salary is very high, and you plan to work a long federal career on top of it, the FERS side can climb. A senior executive who works 15 more federal years is running different numbers than someone who takes a GS-9 for five years before retiring again. But even then, you are still walking away from a guaranteed lifetime military check. That is a heavy thing to give up on a hunch. Model it with your agency benefits officer, do not eyeball it.

When Does Waiving Actually Win?

There is one clean case where waiving makes sense, and it is not really about the trade at all. It is about not having a pension to protect.

If you served but got out before 20 years, no military pension is coming. There is nothing to waive. In that spot, buying back your active-duty time is one of the best returns in the federal benefits system. You pay a small deposit, and those years count toward FERS for the rest of your life. If that is you, our guide on getting a federal job years after separation walks through how early service folds into a federal career.

The trickier "should I waive" case is a medical retiree. Some medically retired veterans draw a small military pension. If that pension is modest, and you have a long federal career ahead, the FERS credit on your bought-back years can outrun the small check you would waive. This is exactly the spot where you run the two numbers from the section above and let the gap decide. There is no rule of thumb here. There is only your math.

What About the Reserve and Combat-Disability Exceptions?

Two groups of retirees never have to make this trade at all. For them, "should I waive" is the wrong question, because they keep both the pension and the FERS credit.

According to OPM's rules on military retired pay, you do not have to waive in two cases. One is a service-connected disability incurred in combat with an enemy of the United States. The other is a disability caused by an instrumentality of war during a period of war. The other exception is retired pay under Chapter 1223 of Title 10, which is the reserve, or non-regular, retirement that Guard and Reserve members earn.

If you are in either group, buying back your active-duty time is a straight win. You keep the pension you earned, and you add the years to FERS on top of it. No trade, no downside. The only real question left is timing your deposit before interest builds. A Guard or Reserve retiree who skips the buyback is leaving guaranteed money on the table. The retiree buyback guide linked above covers the full mechanics of that deposit, including the 3% cost and the interest clock.

How Do You Get the Real Numbers Before You Decide?

My example used round numbers. Your decision should not. Here is how to pull the figures that actually apply to you, in order.

First, get your yearly military pension amount. You already know it. It is on your retiree account statement. Second, get an estimate of your FERS pension both ways, with and without the buyback years. Your agency benefits officer can run this, and it is their job to do it. Ask for both paths in writing.

Third, if you want to model it yourself first, OPM publishes a free tool. The Federal Ballpark Estimator lets you test how added years change your FERS pension. It is a rough estimate, not an official figure, but it is a good gut check before you sit down with HR.

One more step matters if you decide to waive. You have to send a waiver letter to the Retired Pay Operations Center at least 90 days before your planned federal retirement. That timing is easy to miss. Start it early so it does not derail your retirement date.

It also helps to see the full picture of what you take home when a military pension and a federal salary stack. Our breakdown on military retirement pay plus a civilian salary and the dual-compensation rules for federal jobs after retirement both feed into this call.

Does Buying Back Time Do Anything Besides Raise My Pension?

Yes, and it can tip a close call. The annuity boost is the headline, but credited years pull double duty.

Once you pay for your military time, those years also count toward FERS retirement eligibility. They help you reach the years-of-service thresholds that let you retire sooner. If you are two years short of an unreduced federal retirement, five bought-back years can close that gap and change your whole timeline.

Those years also feed the 20-year test that unlocks the higher 1.1% rate at age 62. If your federal service alone would leave you just under 20 years, the bought-back time can push you over the line. That bumps your entire FERS pension from 1% to 1.1% per year, not just the years you bought.

For an exception-group retiree who keeps both checks, this is pure upside. For a waive-group retiree, it is a factor to weigh, not a reason to jump. Faster eligibility is nice. It still does not outrun the value of a full military pension in most cases. Fold it into the same two-number comparison and see if it moves your gap.

What to Do Next

Sort yourself into a bucket first. That settles most of the decision on its own.

If you are a reserve or combat-disability retiree, you do not waive anything. Buy back the time and take both checks. If you are a veteran with no military pension, buy back the time. It is a clear win. If you are a standard active-duty retiree, run the two numbers. In most cases you will keep the pension and let FERS build on your federal years alone.

I am a Navy Diver veteran, and I have watched a lot of retirees wrestle with this exact call. The ones who get burned are the ones who treat the buyback as automatic free money. It is not. It is a trade, and for a 20-year retiree it is often a bad one. The number on the paper decides it, not the sales pitch from whoever is handing you the form.

None of this matters until you actually land the federal job. That is the hard part, and a strong federal resume is what gets you in the door. BMR's Federal Resume Builder turns your service record into a two-page federal resume built the way the selecting official actually reads it. Built by veterans who have sat on the hiring side of the desk. Get hired first. Then let the benefits office run your buyback numbers.