Updated August 2, 2026. Quick answer: two federal employees can leave on the same day, at the same age, with the same service, and start an annuity on the same future date — and one of them will have federal health insurance for life while the other never can again. The difference is whether the separation was a postponed MRA+10 retirement or a deferred one. Nothing about it is intuitive, and it cannot be undone afterwards.
The two doors
| Postponed | Deferred | |
|---|---|---|
| Who can use it | You were already eligible for an MRA+10 annuity on the day you separated | You separated before being eligible for any immediate annuity, with 5+ years of creditable service |
| FEHB | Terminates at separation, but can be reinstated when the annuity begins | Gone permanently |
| FEGLI | May be reinstated based on the coverage held at separation | Not reinstated |
| Age reduction | Reduced or avoided entirely by waiting | None if it starts at 62; MRA+10 reduction applies if taken earlier |
| FERS supplement | No | No |
The sentence that costs the most money in federal retirement
OPM says it in seventeen words, in a handbook chapter almost nobody reads before they resign:
“You cannot reinstate your FEHB coverage if you receive a deferred annuity in the future.”
CSRS/FERS Handbook Chapter 45, Section I. Health Benefits, para A.3
Set against the postponed route, where OPM is equally direct: “The annuitant may reenroll in the FEHB program if he or she met the usual requirements for continuing coverage into retirement at separation.”
Both routes terminate your coverage on the day you walk out — that part is the same, and it is why people assume the routes are the same. They are not. Only one of them lets you back in.
What decides which one you are in
Eligibility at the moment of separation. That is the whole test. If you have reached your MRA and have at least 10 years when you leave, you are eligible for an MRA+10 annuity, and choosing not to start it immediately is a postponement. If you leave before that point — at 50 with 12 years, say, or at 45 with 20 — there is nothing to postpone, and whatever you claim later is a deferred annuity.
So the lever is not paperwork filed later. It is the date you separate. Someone eight months short of their MRA who resigns is choosing, permanently, the door without health insurance behind it — and will usually not find that out for a decade.
Deferred retirement is not a punishment; it is what the law gives you for leaving early, and OPM sets the terms plainly: age 62 with at least 5 years of creditable service, or the MRA with at least 10. But it is a pension and nothing else.
The other condition, which catches people who did everything else right
Reinstating FEHB after a postponed retirement only works if you would have qualified to carry it into retirement at separation in the first place — which means the five-year rule had to be satisfied on the day you left. Postponing does not pause that clock or let you finish it later.
If you are within a few years of the line
The arithmetic of waiting is usually smaller than the health-insurance question, but it is not nothing: what the annuity comes to at each age, including the five-twelfths-of-a-percent-a-month reduction. And note what neither door gives you: the FERS supplement is paid to neither deferred nor MRA+10 retirees, which quietly makes leaving early more expensive than the annuity reduction alone suggests.
Deferred eligibility and the FEHB statement from the OPM CSRS and FERS Handbook, Chapter 45; the postponement rules and the FEHB/FEGLI reinstatement from Chapter 42. Read August 2026. This is eligibility-class material with permanent consequences — confirm your own case with OPM or your agency benefits officer before you separate. General information, not advice.
Military service changes two of these rules: prior active service can be bought into a FERS annuity for 3% of the pay you earned then — usually requiring you to waive military retired pay, though reserve retirees are excepted — and at 65 TRICARE requires Medicare Part B or it ends.