Beyond Twenty

After twenty, every additional year adds to the multiplier and usually to the High-3 as well. It also costs a year of a civilian career that would have its own salary, its own retirement plan, and its own compounding.

The honest comparison is not “pension at twenty versus pension at twenty-four.” It is “pension at twenty plus four years of civilian earnings and savings” against “pension at twenty-four.” Which wins depends on your civilian earning potential, and for many people the answer is not the one the culture assumes.

What a year is worth, precisely

An additional creditable year adds 2.5 percent of the High-3 under the legacy system and 2.0 percent under the Blended Retirement System. On a High-3 of $8,000 a month — an illustration, not a claim about your pay — that is $200 or $160 a month, for life, inflation-adjusted, for each year served past twenty. Four more years under the legacy multiplier moves a 50 percent pension to 60 percent. The multiplier is capped at 100 percent of the High-3, which under the legacy rate is reached at forty years of creditable service and under the Blended Retirement System is not reached within any realistic career.

The second term moves too, and less predictably. The High-3 responds to a promotion only after thirty-six months at the higher rate, so a grade pinned two years before a retirement date lifts two-thirds of the average and no more. This is what makes the “one more year” question genuinely hard: the year that completes a thirty-six-month window is worth substantially more than the year before it or the year after it, and the shape of that curve is specific to your own promotion dates. Recalculate after every pay raise and every promotion, and write the result down with the date, so that the decision is made against a current number rather than a remembered one.

The other side of the ledger

The civilian side is harder to estimate and is therefore usually left out, which is precisely why the comparison so reliably favours staying. A civilian salary is not the whole of it. An employer retirement contribution, equity or profit sharing where it exists, and the compounding on everything saved in those years all belong in the same column — and so does the fact that starting a second career at forty-two rather than forty-six changes the seniority you reach before you stop working altogether.

Against that, the years past twenty carry advantages that do not appear on a pay statement. Credentials are markedly cheaper to earn while serving than afterward, and to many civilian employers the credential is worth more than the military experience beneath it. The Thrift Savings Plan is still open, and the senior years are when there is finally room to use it: for calendar year 2026 the elective deferral limit is $24,500, with an additional $8,000 of catch-up contributions available from the year you turn 50 and $11,250 for participants aged 60 through 63. New for 2026, catch-up contributions must be made as Roth if your prior-year FICA wages exceeded $150,000. Four more years of maximum contributions is a large number in its own right and belongs in the stay-or-go arithmetic rather than being treated as separate from it.

Run both columns as monthly figures, net of tax and net of any survivor premium, because that is the only form in which they are comparable. An accredited or fee-only financial planner will build the two projections alongside each other; ask them explicitly to model the civilian path with its own retirement savings included, since a comparison that omits that is the standard way this decision gets made badly.

The choice is not entirely yours

Two mechanisms can settle the question before you do.

High year tenure sets a mandatory separation date for your grade, and it can arrive before the date you planned to leave. The rules differ by service, by grade and by component, and they move with force management needs, which means any figure quoted on a forum is worth nothing. Ask your servicing personnel section for your own date in writing and check it against your intended retirement date. It is free and it takes one request.

Service obligations run the other way. A school, a course, an assignment or a permanent change of station accepted after twenty years attaches its own commitment, and those commitments do not always run concurrently — they can stack, and they can push a retirement date out by years. The obligation is documented at the moment you accept, which is the only convenient moment to read it. Ask for it in writing before the acceptance, not after, and ask specifically which existing obligations it runs alongside and which it runs after.

Two irreversible items that live in these years

The years past twenty are the last stretch in which the service treatment record is still being written. A disability claim is decided on evidence, and a contemporaneous entry made when an injury happened is worth more than any account assembled later. Long-career members frequently have the most service-connected conditions and the thinnest documentation, because the culture rewards not going to sick call. Report symptoms to a military provider when they occur and keep your own copies. An accredited Veterans Service Organization representative will review the file at no charge, and what to document and how it is likely to be rated is a question for them and for your provider rather than something to guess at.

The second is the interaction between military retired pay and a federal civilian annuity, which catches people who take a government job after retiring. Federal civilian service under FERS can count military service toward the civilian annuity, but generally only where the employee makes a deposit and waives military retired pay, and once the federal annuity begins that waiver is normally permanent. For a twenty-year retiree the retired pay being given up is usually large enough to make the trade a bad one; for someone with a few years of military service and no retired pay at all, the deposit is often clearly worth it. The details turn on the type of retired pay and on your own service history. Put the question to the agency human resources office and to a benefits specialist, ask for the answer in writing, and ask what the waiver would mean if you later changed your mind.

Leave is money until the fiscal year ends

Leave accrues at 2.5 days a month and carries over at up to 60 days into the new fiscal year. Anything above that cap is lost — not paid, not restored. Senior members are the ones most exposed to this, because the assignments that generate the most unused leave are the same assignments that make taking it hardest. Special leave accrual exists for specific operational circumstances and is approved case by case, never automatically. Check the balance on the Leave and Earnings Statement monthly and schedule against the cap rather than discovering it in September.