Federal Employee Phased Retirement: How It Works, Who Qualifies, and What It Pays

OPM's phased retirement program lets eligible FERS employees drop to a 50% work schedule and immediately begin collecting 50% of the pension they would have received if they'd retired fully — all while continuing to build service credit, keep FEHB, and contribute to TSP. For the right employee in the right situation, it's a powerful bridge between full-time federal employment and full retirement.

This guide covers eligibility, the income math, TSP strategy during phased employment, and the composite annuity calculation that determines your final pension.

Legal Background

Congress authorized phased retirement under Section 100121 of the Moving Ahead for Progress in the 21st Century Act (MAP-21, Public Law 112-141), signed July 6, 2012.¹ OPM published implementing regulations (5 CFR Part 848) effective November 6, 2014.² The statute is codified at 5 U.S.C. § 8412a (FERS) and § 8336a (CSRS).

Who Is Eligible

To enter phased retirement you must meet both conditions:²

1. Eligible for an immediate, unreduced FERS retirement — meaning you have already reached one of these combinations:
   • MRA (ages 55–57 by birth year) + 30 years of service
   • Age 60 + 20 years of service
   The 62+5 combination also satisfies this, though few 62-year-olds elect phased over full retirement.
2. Employed on a full-time basis for the 3 consecutive years immediately preceding the phased retirement election.

You are not eligible if you are in a special retirement category: law enforcement officers, firefighters, air traffic controllers, nuclear materials couriers, or Capitol Police. Those special category employees have mandatory retirement ages and cannot convert to phased retirement.²

Disability annuitants and reemployed annuitants are also excluded.

Your Minimum Retirement Age (MRA)

How Phased Retirement Works

Under OPM's current rules, phased retirement means one thing operationally: a 50% work schedule.³ The underlying statute allows schedules ranging from 20% to 80% of full-time, but OPM has authorized only the 50% option. Expect this to stay unless OPM amends 5 CFR Part 848.

During phased retirement you receive both a salary (for the 50% you work) and a phased retirement annuity (described below). Combined, they typically replace 75–90% of your prior full-time pay before taxes — more than most retirees draw from a FERS pension alone.

The Mentoring Requirement

At least 20% of your working hours must be spent in documented mentoring or knowledge transfer activities.² For a standard 20-hour part-time schedule, that's 4 hours per week. Agencies can waive this in genuine emergencies (military activation, documented agency need), but it is the norm. USPS employees are exempt from the mentoring requirement.

How Long Can Phased Retirement Last?

There is no federally mandated maximum duration.³ Each agency sets its own time limits by mutual agreement — common ranges are 1 to 3 years, depending on agency policy. Extensions are possible if both you and your agency agree. When phased retirement ends, you move directly to full retirement with OPM processing your composite annuity.

Agency Approval

Phased retirement requires a written mutual agreement between you and an authorized agency official.² Your supervisor may or may not be the approving official — agencies designate this internally. The process:

1. Confirm your agency offers phased retirement (not all do)
2. Submit a written request to the authorized official
3. Receive written approval
4. File an application with OPM

Agencies can deny requests without explanation. A position that is difficult to staff half-time, or a mission-critical role, is likely to be denied even if you're personally eligible.

Your Income During Phased Retirement

Two income streams run simultaneously:

1. Salary (50% of Full-Time Pay)

You receive 50% of your regular basic pay — the same salary your position would have if you worked full-time, divided by two. Step increases and locality adjustments continue to apply to your position's full-time salary, affecting your phased pay proportionally.

2. Phased Retirement Annuity

OPM calculates what your full FERS pension would have been if you'd retired on the date phased retirement begins — using your High-3 average salary and years of creditable service at that moment — then pays you 50% of that amount:⁴

Phased Annuity = (Multiplier × High-3 × Years of Service) ÷ 2

The multiplier is 1% unless you are at least age 62 with 20+ years of service, in which case it is 1.1%.

Example: A GS-14 employee, born 1967 (MRA = 56 yr 6 mo), retiring phased at age 57 with 30 years and a $135,000 High-3:

• Full annuity would have been: 1% × $135,000 × 30 = $40,500/year
• Phased retirement annuity: $40,500 ÷ 2 = $20,250/year ($1,688/month)
• Salary (50% of $135K): $67,500/year ($5,625/month)
• Gross combined income: $87,750/year — 65% of prior $135K salary

The FERS Supplement During Phased Retirement

You may receive the FERS Annuity Supplement (the bridge payment to Social Security) if you are under 62 and enter phased retirement from an MRA+30 or 60+20 retirement eligibility — but there is an important trap.⁵

The supplement is subject to an annual earnings test: in 2026, you lose $1 of supplement for every $2 of earned income over $24,480.⁵ Your 50% salary during phased retirement counts as earned income. Most phased retirees earn well above $24,480 in part-time salary, so the supplement is either heavily reduced or wiped out entirely.

Example: Same GS-14 with $67,500 part-time salary. Earnings test reduction: ($67,500 − $24,480) ÷ 2 = $21,510 reduction. If supplement would have been, say, $18,000/year, it is completely eliminated. Plan your income as if the supplement does not exist during phased retirement unless your part-time salary is very low.

FERS COLA During Phased Retirement

FERS COLA does not apply until age 62 (standard FERS rule). If you enter phased retirement before 62, your phased annuity is locked until you hit 62, then COLAs begin applying. After full retirement, the FERS COLA formula applies to your composite annuity.⁶

TSP During Phased Retirement

Your TSP participation continues, with two changes from your full-time status:

• Your salary base for contributions is your reduced 50% pay. Contribution limits ($24,500 elective deferral; $8,000 catch-up at 50+; $11,250 super catch-up at 60–63 for 2026) still apply — but hitting them requires deferring a higher percentage of your reduced paycheck.⁷
• Agency matching is calculated on the reduced basic pay. The government still matches up to 4% of your basic pay (1% automatic + dollar-for-dollar on first 3% + 50 cents on next 2%), but the dollar amount of matching is half what it was before. To maximize the match, you still need to contribute at least 5% of your part-time salary.⁸

You may also want to consider the TSP in-plan Roth conversion (launched January 28, 2026): you can now convert traditional TSP balances directly within the plan, up to 26 times per year. Phased retirement's moderate income year is potentially useful for this — see our TSP Roth Conversion guide.

FEHB and FEGLI During Phased Retirement

Your FEHB health coverage continues as an active employee — not retiree coverage — during phased retirement, provided you were enrolled for the 5 years immediately before phased retirement (or the entire period since your first opportunity to enroll).⁹ The government premium contribution continues at the active-employee rate.

FEHB premiums are deducted from the annuity portion of your income (not the salary portion). FEGLI coverage also continues during phased employment under the same premiums and coverage levels as before.

When you move from phased retirement to full retirement, FEHB transitions from active to retiree coverage, and premiums are deducted from your full retirement annuity.

Social Security Credits During Phased Retirement

You continue paying FICA taxes on your basic pay during phased retirement, which earns you Social Security credits and — if your phased retirement salary meaningfully increases your covered earnings history — may modestly improve your eventual Social Security benefit.¹⁰

The earnings test that limits Social Security benefits before Full Retirement Age (FRA) is separate from the FERS supplement earnings test. If you are under FRA and collecting Social Security early, your combined phased retirement salary and other income would be subject to that SSA earnings test.

Your Composite Annuity at Full Retirement

When phased retirement ends and you fully retire, OPM calculates a composite annuity under 5 CFR § 848.502:²

1. Component 1 (Phased Retirement Annuity): The 50% annuity you were already receiving, adjusted for any FERS COLAs since phased retirement began (COLAs only apply from age 62 forward).
2. Component 2 (Phased Service Credit): OPM calculates what your annuity would have been if you had worked full-time throughout the phased period (using your full-time rate of pay for the position, not your actual reduced earnings) — then multiplies that by 50% (the working percentage). This credits you for the additional service accrued during phased retirement, computed at your full position rate.

Composite Annuity ≈ Phased Annuity + (Additional Service Years × Full-Time Multiplier × Full-Time High-3 × 50%)

The practical effect: you receive more annuity at full retirement than you'd expect from simply adding "2 years of part-time service." The additional component is calculated at the full position salary, not your reduced pay. This is one of the more favorable design features of phased retirement.

Continuing the example above (GS-14 phased at 57, $135K salary, 30 years, 2-year phased period):

• Component 1 (phased annuity): $20,250/year (no COLA before 62)
• Additional service: 2 years at full rate → 1% × $135,000 × 2 years × 50% = $1,350/year
• Composite annuity at 59: ~$21,600/year ($1,800/month)
• If held to age 62 (62+32 years): 1.1% × $135K × 32 × 50% = $23,760 + Component 1 adjustment — significantly higher with the enhanced multiplier

Phased Retirement Income Calculator

Estimate your income during phased retirement and your composite annuity after fully retiring.

Phased Retirement vs. Alternatives

When Phased Retirement Makes Sense

Strong candidates for phased retirement:

• You need to reduce physical or travel demands but aren't ready to fully step back — and your agency can accommodate half-time
• Your combined income (50% salary + 50% annuity) comfortably covers expenses — typically true for GS-13+ employees with low-debt situations
• You want to bridge to a specific date (Social Security FRA, age 62 for the 1.1% multiplier, or a spouse's retirement date)
• You have knowledge that genuinely benefits from a structured handoff — mentoring isn't just a requirement, it's a meaningful contribution and can ease the psychological transition to retirement
• Your agency actively supports phased retirement — if your supervisor or agency HR is unfamiliar with it or skeptical, the approval process is an uphill battle

Poor candidates:

• Employees in roles that simply cannot function at 50% (leadership positions, positions requiring continuous presence, high-security clearance roles where part-time access is complex)
• Employees whose combined income still falls short of expenses — in that case, working full-time or fully retiring and drawing TSP may generate more cash flow
• Employees within 2–3 years of age 62 who would benefit significantly from the 1.1% multiplier — staying full-time to hit that threshold is often the better math

What a Specialist Can Model for You

The phased retirement calculation sounds clean but the personal optimization involves a lot of moving parts: your specific FEHB plan and whether it's better active or retiree, your TSP allocation and whether the Roth conversion window is worth using, the supplement earnings test interaction, the optimal duration to capture the 1.1% multiplier at 62, and whether your agency will actually approve the request for your role. A federal retirement specialist can run the full scenario — phased vs. full vs. delayed — with your actual numbers.

Sources

1. Public Law 112-141 (MAP-21) § 100121 — authorized federal phased retirement, signed July 6, 2012.
2. 5 CFR Part 848 (eCFR) — OPM phased retirement implementing regulations, effective November 6, 2014. Covers eligibility (Subpart B), mentoring (Subpart D), and composite annuity (Subpart E, § 848.502).
3. OPM — Phased Retirement FAQ — confirms 50%-only schedule under current OPM policy, agency discretion, and duration rules.
4. 5 U.S.C. § 8412a — FERS phased retirement statute; annuity is "50 percent of the annuity computed under section 8415."
5. OPM — FERS Annuity Supplement — earnings test for 2026 at $24,480 (annual Social Security Administration adjustment).
6. OPM — FERS COLA determination — FERS COLA not paid before age 62 (standard FERS rule, 5 U.S.C. § 8462); 2026 COLA was 2.0%.
7. TSP — Contribution Types and Limits — 2026 elective deferral $24,500; catch-up at 50+ $8,000; super catch-up at 60–63 $11,250 (SECURE 2.0 §109). // 2026 per IRS Rev. Proc. 2025-32
8. TSP — Agency Automatic and Matching Contributions — 1% automatic + matching formula; matching applies to basic pay only, not phased annuity income.
9. OPM — FEHB Handbook — 5-year enrollment requirement to continue FEHB into retirement; active employee premium structure during phased employment.
10. SSA — Social Security for Federal Government Employees — FERS employees pay FICA taxes and earn credits on all basic pay, including phased retirement salary.

All values verified as of May 2026. FERS earnings test threshold is the 2026 Social Security Administration adjustment ($24,480). TSP contribution limits are 2026 per IRS Rev. Proc. 2025-32.

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