Most of the FEHB-into-retirement conversation focuses on the five-year rule. That focus is correct — the five-year rule is the rule that gets broken most often. But there is a second requirement that gets far less attention and disqualifies a different group of federal employees in roughly the same way. It is called the immediate annuity requirement, and it exists to make sure that retirees who carry FEHB are actually receiving an annuity from the federal government when they do so.

The rule is short, the consequences of misunderstanding it are long, and the federal employees most often caught by it are the ones who made the earliest possible decision to leave federal service.

What an immediate annuity is.

An immediate annuity, in the FEHB-into-retirement context, means an annuity that begins paying benefits within 30 days of your retirement date. For most federal employees who retire under FERS or CSRS at or after their minimum retirement age, the annuity begins automatically the day after you separate — or the first of the following month, depending on your agency’s payroll cycle. That is an immediate annuity. It satisfies the requirement.

Most federal employees never have to think about this requirement because their retirement, by default, produces an immediate annuity. They file their paperwork, their agency processes it, and the annuity begins. FEHB eligibility for retirement follows.

What a deferred annuity is.

A deferred annuity is an annuity that you have earned the right to receive but that you have chosen — or been required — to postpone. The classic case is a federal employee who leaves federal service before reaching minimum retirement age (MRA) under FERS and chooses to leave their contributions in the retirement system. The contributions stay in the fund, the service credit is preserved, but no annuity is paid out until the employee reaches age 62 (or later, if they continue to defer).

Deferred annuities are perfectly legitimate retirement outcomes. Many federal employees take a deferred annuity because they are moving to a different career, going back to school, taking care of family, or simply leaving on terms that don’t include immediate retirement. A deferred annuity preserves all of your earned benefits for the future.

Why a deferred annuity disqualifies FEHB.

The OPM regulations are explicit: FEHB may be carried into retirement only when the retiree is receiving an immediate annuity. A deferred annuity does not qualify, even when the federal employee has met the five-year FEHB coverage rule, even when the deferred annuity will eventually pay benefits, and even when the federal employee has 20 or 30 years of service. The eligibility for FEHB-in-retirement is keyed to the moment of retirement, and at that moment, no annuity is being paid.

The reasoning, again, is adverse selection. OPM does not want federal employees to maintain FEHB enrollment for years between their separation and the start of their deferred annuity — paying the lower active-employee share of premiums — and then transition into retiree status years later. So the regulation draws the line at the point of immediate annuity.

The workaround: enroll in FEHB during the deferred period.

Federal employees who take deferred annuities canenroll in FEHB under the temporary continuation of coverage (TCC) provisions — for up to 18 months after separation, paying the full premium (employee plus government shares, with no government contribution) plus a 2% administrative fee. After 18 months, FEHB ends. It does not resume when the deferred annuity begins paying, unless the employee returns to federal service and rebuilds the five-year clock.

The trap for early leavers.

The most common case I see is a federal employee in their late 40s or early 50s who is leaving for a different career. They have 10 to 15 years of federal service. They are eligible for a deferred FERS annuity at age 62. They have FEHB now and assume that the deferred annuity will eventually include FEHB coverage. It will not. The deferred annuity will pay benefits at 62, but FEHB ends 18 months after separation, full stop.

When this becomes a problem, it usually becomes a problem unexpectedly — between the ages of 50 and 60, when private insurance is most expensive and most relevant. The federal employee suddenly discovers that the FEHB they had for years is gone, and the only way to get it back is to return to federal service for five continuous years. That is not a small commitment.

What to do before deciding to leave.

If you are considering leaving federal service before MRA and you want to preserve some version of FEHB into the future, get clear on what you are giving up. The TCC period is real but temporary. The deferred annuity is real but does not include FEHB. The only path that preserves FEHB into retirement is the path that ends with an immediate annuity — either by retiring at or after MRA, or by returning to federal service long enough to retire on an immediate basis later.