FERS Phased Retirement: How It Works, Who Qualifies, and Whether It Makes Sense

Most federal employees face a binary choice: keep working full-time or retire. OPM's phased retirement program creates a third path — half-time work, half pension, and full benefits continuity. Here's the honest breakdown of what it delivers and what it costs you.

Part 1: Eligibility

To elect phased retirement you must already be eligible for an immediate retirement under FERS. The three qualifying combinations are:²

• MRA + 30 years: Reached your Minimum Retirement Age (55–57 depending on year of birth) with at least 30 years of creditable service. This is the most common path for career federal employees.
• Age 60 + 20 years: At least 60 years old with at least 20 years of creditable service.
• Age 62 + 5 years: At least 62 years old with at least 5 years of creditable service.

Additionally, you must have been employed full-time immediately before the phased retirement election. Part-time employees, employees in intermittent schedules, and employees in Senior Executive Service positions with SES-specific restrictions should confirm eligibility directly with their HR office.¹

Part 2: How the pay and annuity split works

During phased retirement, OPM calculates what your annuity would be if you retired fully on that date — including your high-3, years of creditable service, any sick leave credit, and survivor annuity election. You then receive exactly half of that annuity, paid as a retirement annuity. Your agency pays you the other half of your salary for the half-time work you continue to perform.

The result: your total gross income during phased retirement is roughly the same as your income from your salary alone, but the source has shifted — half comes from your agency payroll, half from OPM retirement payments.

Worked example — GS-14 step 7, Washington DC locality

Suppose a GS-14 employee in the DC locality has:

• High-3 average: $148,000
• Years of creditable service: 31 years
• Age at phased retirement election: 57 (MRA for someone born 1970+)
• Survivor election: 50% survivor (10% reduction)

Full annuity if retired today (before survivor reduction):
$148,000 × 1.0% × 31 = $45,880/year

With 50% survivor reduction (10%): $45,880 × 0.90 = $41,292/year

During phased retirement:

• Phased annuity (50% of $41,292): $20,646/year ($1,720/month)
• Part-time pay (50% of ~$148,000 full salary): ~$74,000/year
• Total gross income: ~$94,646/year

Compare to full-time employment at ~$148,000/year — the drop is meaningful (~$53K less). Phased retirement makes the most financial sense when the flexibility or reduced stress is worth more to you than that difference, or when phased work prolongs the period of high-3 accrual and service credit.

Part 3: The mentoring requirement

Federal law requires that phased retirees dedicate 20% of their part-time schedule to mentoring other employees.¹ On a standard 20-hour-per-week arrangement, that's 4 hours per week of structured mentoring activity.

OPM defines mentoring broadly — it can include formal coaching, documentation of institutional knowledge, training newer employees in procedures, or other knowledge-transfer activities. Your agency may have more specific definitions. This requirement exists because Congress designed phased retirement explicitly as a knowledge-transfer mechanism, not purely as an early-retirement benefit.

In practice, many employees find the mentoring obligation natural and welcome — it formalizes what often happened informally anyway. But if your position doesn't lend itself to mentoring (highly specialized individual-contributor technical roles, for example), this can be an awkward fit.

Part 4: What happens to FEHB, FEGLI, and TSP

FEHB (Federal Employees Health Benefits)

You remain an active employee during phased retirement, so your FEHB coverage continues under the same terms as when you were full-time. Your premium share is calculated on your part-time pay schedule, which may slightly increase your biweekly FEHB premium cost since government cost-sharing adjusts for part-time employees.

The five-year continuous enrollment requirement for carrying FEHB into full retirement continues to accumulate during phased retirement.³ If you were already eligible (5 years of continuous FEHB enrollment before phased retirement), you remain eligible for FEHB in full retirement.

FEGLI (Federal Employees' Group Life Insurance)

FEGLI continues during phased retirement as active-employee coverage. Coverage amounts are based on your part-time salary (since your "annual basic pay" during phased retirement reflects the part-time rate). If you had Basic and optional coverage before phased retirement, review whether coverage amounts change when your official salary drops to 50%.

TSP

You can continue to contribute to your TSP during phased retirement. The agency matching contribution — up to 5% of your part-time pay — continues. This is a meaningful benefit: you are still accruing TSP assets and maintaining agency match during a period when many retirees would have stopped contributions entirely.

One tradeoff: your contribution amount as a percentage of a lower part-time salary is lower in absolute dollars unless you increase your contribution rate. Many employees in phased retirement max out the elective deferral limit ($24,500 in 2026, or $33,500 with catch-up at ages 50–59/64+, or $36,250 at ages 60–63 super-catch-up)⁴ to make the most of continued tax-advantaged growth.

No FERS supplement during phased retirement

The FERS supplement is only available to employees who have fully separated from federal service and are between their MRA and age 62. During phased retirement you are still an active employee — you are not eligible for the FERS supplement.² This is a material consideration if you planned to use the supplement as income before Social Security eligibility.

Part 5: The final retirement annuity calculation

When you elect full retirement after a phased retirement period, OPM calculates what is sometimes called a "composite annuity." The formula combines two components:¹

1. Phased annuity component: 50% of the annuity you were receiving during phased retirement, adjusted for any cost-of-living increases that occurred.
2. Annuity earned during phased retirement: 50% of the annuity calculated as if you had worked full-time throughout the entire period — both before and during phased retirement — at your full-time salary rate.

The net effect: your final annuity is roughly equivalent to what you would have received had you stayed employed full-time for the same calendar period. The additional service credit earned during phased retirement (counted at full-time equivalence for the formula) offsets the lower actual hours worked. In the GS-14 example above, working 3 additional years in phased retirement would be treated similarly to 3 additional years of full-time service for annuity calculation purposes.

Part 6: Phased retirement vs. the alternatives

Note: part-time employment before retirement affects the high-3 if pay drops during those years and they fall within the three-year high-3 window. Phased retirement avoids this trap by design — the composite annuity formula treats phased service at the full-time salary equivalent.

Part 7: Who benefits most from phased retirement

Phased retirement tends to make the most sense for employees who:

• Have a meaningful income need but want reduced hours. If you need the income stream of federal employment but are burning out on full-time work, the 50/50 split provides most of the income at half the schedule.
• Are at the edge of a service milestone. If you're at 29 years of service and considering retirement, staying in phased retirement for one more year pushes you to 30+ years and locks in the MRA+30 full annuity formula (1.0% multiplier, no reduction). Alternatively, if you're close to the 20-year / age 60 threshold, phased retirement may let you bridge to it without the MRA+10 penalty.
• Want to keep FEHB as primary through Medicare eligibility. As a still-active employee, your FEHB remains active coverage. Some federal employees near 65 prefer to work (even part-time) to delay Medicare enrollment decisions. This overlaps with the FEHB-Medicare coordination question — see our FEHB and Medicare guide.
• Have TSP assets they want to keep growing tax-deferred. Continued TSP contributions and agency match during phased retirement extend the compounding window without requiring full-time employment.
• Have an institutional knowledge role that fits the mentoring requirement. Supervisors, program managers, senior specialists, and long-tenure employees with deep institutional knowledge are the natural fit for the mentoring mandate.

Phased retirement is generally not the right choice if:

• You need the FERS supplement income immediately (not available until full separation).
• Your agency is unlikely to approve it (high-operational-tempo units, agencies with active RIF/VERA programs that need full headcount departures).
• Your position can't realistically be performed half-time (clinical roles, law enforcement, certain supervisory positions).
• The income drop from full salary to half-pay-plus-annuity creates cash-flow problems (especially relevant if you have significant housing costs or college expenses).

Part 8: The transition to full retirement

There is no mandatory time limit on phased retirement — you can remain in that status as long as your agency continues to approve it. When you are ready to fully retire, you submit the standard SF-3107 retirement application. OPM then calculates the composite annuity as described in Part 5 and issues your full retirement annuity.

At full retirement, the standard rules apply: survivor annuity elections finalize (you made the election when entering phased retirement, but you can adjust at the full-retirement paperwork stage — confirm with your HR office), FEHB transitions to retiree coverage, and FERS supplement eligibility is evaluated based on your age and service at the time of full retirement.

One timing consideration: if you entered phased retirement just before age 62 (for example, at 60 with 20+ years), and you fully retire after reaching 62, you may qualify for the 1.1% annuity multiplier instead of 1.0% — which increases your annuity by 10%. The composite annuity formula takes this into account for the service accrued during phased retirement. This can be a meaningful gain worth planning around.

Getting the numbers right for your specific situation

Phased retirement math gets complicated quickly when you factor in survivor annuity elections, FEHB premium adjustments, TSP contribution optimization, and the composite annuity formula applied to your actual salary history. The numbers above are directional — your specific high-3, service history, locality pay, and sick leave balance all affect the outcome.

A fee-only advisor who specializes in federal benefits can model the full scenario — phased vs. full retirement vs. staying full-time — using your actual OPM Service Computation Date and salary history. The calculation differences can run $5,000–$15,000 per year in annuity income depending on the path chosen.