FERS Retirement Income Planning: Annuity, TSP, and Social Security (2026)

Federal employees retire with a three-source income structure — FERS basic annuity, TSP, and Social Security — that interacts in ways generic retirement guides never address. The FERS Supplement provides a temporary income bridge that terminates sharply at age 62, creating a planning cliff most federal retirees don't see coming. The TSP offers institutional pricing and unique distribution options, but rolling it to an IRA has tradeoffs that matter. And FEHB continuation in retirement is one of the most undervalued benefits in the federal workforce. This guide covers all of it.

The FERS three-legged structure

FERS replaced the older Civil Service Retirement System (CSRS) for federal employees hired after January 1, 1984. Unlike CSRS — which provided a large pension but no Social Security — FERS was designed from the start as three coordinated components:

The FERS Supplement (discussed below) is sometimes called a fourth leg — it bridges the income gap between retirement and age 62 when Social Security becomes available.

FERS basic annuity: the calculation

The FERS pension formula is straightforward and employer-funded. Your basic annuity is:¹

The High-3 average salary is the average of your three highest consecutive years of basic pay — typically your final three years. It does not include overtime, bonuses, or certain allowances.

Sick leave credit: Accumulated unused sick leave is converted to additional service credit at retirement. One year equals 2,087 hours. A federal employee who retires with 2,087 hours of unused sick leave adds a full year to their service computation — increasing the pension by 1% to 1.1% of the high-3 average.

Worked pension examples

FERS COLA: Unlike CSRS pensions, which receive full annual cost-of-living adjustments, FERS annuities receive a reduced COLA in years when CPI exceeds 2%. In 2026, the FERS COLA was 2.0% (CPI was 2.8%, so FERS gets CPI minus 1%).² Over a 25-year retirement, this 0.8%/year COLA shortfall compounds — a real purchasing power gap to plan for.

FERS Minimum Retirement Age (MRA)

Your ability to retire with an immediate annuity depends on your age and years of service. FERS established a Minimum Retirement Age (MRA) that varies by birth year:¹

MRA+10 early-out: If you have at least 10 but fewer than 30 years of service at your MRA, you can retire with an immediate annuity — but it's reduced 5% for each year you are under age 62. At MRA+10 with 15 years of service and age 57, a 5-year gap to 62 means a 25% permanent reduction. This is the FERS "early-out" penalty, and it's significant enough to model carefully.

The FERS Supplement: the income bridge and the age-62 cliff

The FERS Supplement is paid to FERS retirees who retire before age 62 under an immediate annuity with at least one year of service. It approximates the Social Security benefit attributable to the employee's FERS-covered service, and fills the income gap until SS becomes available at 62.¹

Supplement formula: Estimated SS benefit at age 62 × (years of FERS service ÷ 40)

Example: An employee with 30 years of FERS service whose SSA estimate shows a $2,200/month benefit at 62 would receive: $2,200 × (30/40) = $1,650/month supplement, or about $19,800/year.

Earnings test: The FERS Supplement is subject to the same earnings test as Social Security. For 2026, the exempt amount is $24,480/year.³ If you earn more than that — from wages or self-employment, but not from investments or annuity income — the supplement is reduced by $1 for every $2 of excess earnings. Consulting or part-time work in the years before 62 can eliminate the supplement entirely.

Strategies to manage the age-62 cliff

• TSP bridge withdrawal: Increase TSP distributions from age 62 onward to replace the supplement income. Size the increase to match the supplement (typically $15,000–$25,000/year for most retirees) while monitoring IRMAA thresholds.
• Roth conversion runway: The supplement years (MRA to 62) are often ideal for Roth conversions — lower bracket, no SS income yet (no provisional income cascade). Use this window to reduce the future TSP balance before RMDs start.
• Delay SS to 70: Claim Social Security at 70 rather than 62. The supplement bridge covers ages MRA–62, TSP covers ages 62–70, and Social Security arrives maximized. This is usually optimal if you're in good health and have adequate TSP balance.
• Pre-fund with taxable or Roth contributions: In the final working years, maximize contributions to Roth TSP or a taxable brokerage account to build a tax-efficient bridge for ages 62–70.

TSP at retirement: distribution strategy

The Thrift Savings Plan is a uniquely advantaged retirement account. Its institutional C, S, I, F, and G funds carry expense ratios as low as 0.048% (2025 figures) — far below what most IRA fund options cost. At retirement, you face a series of TSP distribution decisions that are difficult or impossible to reverse.

TSP distribution options

TSP rollover to IRA: the tradeoff

Rolling your TSP to an IRA is the default assumption for most retirement planning advice — but for FERS retirees specifically, staying in the TSP has real advantages:

• Expense ratios: TSP core funds (C, S, I, G, F) cost 0.048% or less. The cheapest equivalent at Vanguard/Fidelity is typically 0.03–0.04% — roughly comparable, but TSP's G Fund (government securities, no credit risk, guaranteed not to lose principal) has no IRA equivalent.
• Creditor protection: TSP assets are protected from creditors under ERISA. IRA protection varies by state.
• RMD management: If you have other IRAs, you cannot aggregate TSP RMDs with IRA RMDs — TSP has its own RMD that must be taken separately. Rolling TSP to an IRA simplifies RMD aggregation across all accounts.
• Roth conversion access: The TSP does not allow in-plan Roth conversions. To convert traditional TSP to Roth, you must roll to a traditional IRA first, then convert to Roth IRA — an extra step but fully doable.

Traditional TSP vs. Roth TSP at retirement

Since 2012, the TSP has offered a Roth option with after-tax contributions. At retirement:

• Traditional TSP: Withdrawals are ordinary income — fully taxable. Subject to RMDs starting at age 73 (born 1951–1959) or 75 (born 1960+) under SECURE 2.0.⁴
• Roth TSP: Tax-free qualified distributions (5-year holding period met + age 59½). No lifetime RMDs since January 2024 under SECURE 2.0 § 325.⁴ If rolled to Roth IRA, the 5-year clock carries over.

The FERS pension creates a guaranteed income floor, which means most FERS retirees have less need to annuitize TSP assets for floor income. That frees the TSP to serve as a tax-diversification tool: drawing from traditional TSP to fill low brackets, while letting Roth TSP compound tax-free for legacy or late-retirement flexibility.

TSP contribution limits 2026

For FERS employees still working and maximizing TSP contributions before retirement:⁵

• Elective deferral limit: $24,500
• Catch-up limit (age 50–59 or 64+): $8,000
• Super catch-up limit (ages 60–63, per SECURE 2.0 § 109): $11,250 — an additional $3,250 versus the standard catch-up

Social Security integration

Unlike CSRS employees — who did not pay Social Security taxes and received no SS benefit — FERS employees contribute full FICA taxes on all wages. This means every FERS employee earns a full, unreduced Social Security benefit based on their entire earnings history.

WEP and GPO are repealed. The Social Security Fairness Act (Pub. L. 118-243, January 2025) repealed both the Windfall Elimination Provision and the Government Pension Offset permanently.⁶ FERS employees are unaffected by WEP/GPO because they pay full SS taxes — but federal employees who also spent years in state or local government jobs (which didn't pay SS taxes) previously had their SS benefit reduced by WEP. That reduction is now eliminated.

SS claiming with the FERS Supplement bridge: Because the supplement covers ages MRA–62, most FERS retirees have the ability to delay Social Security well past 62 — and gain the 8%/year delayed credit from their Full Retirement Age to age 70. For a federal employee with an FRA benefit of $2,400/month:

• Claim at 62: ~$1,680/month (30% reduction, FRA = 67)
• Claim at FRA 67: $2,400/month
• Delay to 70: $2,976/month (8%/year × 3 years = 24% increase over FRA)

The lifetime break-even between FRA and 70 is typically age 82–83 for a single filer. For couples, delaying the higher earner's benefit to 70 maximizes the survivor benefit — the surviving spouse receives the higher of the two SS checks for the rest of their life.

FEHB: the undervalued benefit

Federal Employee Health Benefits (FEHB) continuation in retirement is one of the most valuable financial benefits in the federal workforce — and one of the least discussed in retirement income planning.

To carry FEHB into retirement, you must have been continuously enrolled in FEHB for the five years immediately before retirement (or since your first opportunity to enroll if fewer than five years of service).¹ If you qualify, you pay the same premium share in retirement as you did as an active employee — approximately 28–30% of the total premium for most plans.

Compare: A FERS retiree at age 62 with FEHB coverage pays perhaps $5,000–$8,000/year for a self-plus-one plan. The same 62-year-old purchasing a benchmark Silver plan on the ACA marketplace in 2026 — without employer subsidy, since enhanced ACA credits expired — pays approximately $15,914/year.⁷ The FEHB advantage can represent $8,000–$12,000/year in after-tax cost savings through age 65.

FEHB and Medicare at 65

At 65, FERS retirees face a FEHB-Medicare coordination decision:

• FEHB only: Decline Medicare Part B (save the $185/month 2026 Part B premium). FEHB remains primary. Works if your FEHB plan has good cost-sharing.
• FEHB + Medicare Part A/B: Medicare becomes primary; FEHB wraps around and covers most of what Medicare doesn't. Effectively near-zero out-of-pocket for most services. Costs the Part B premium but eliminates nearly all cost-sharing.
• Suspend FEHB, Medicare only: Rarely optimal — you can re-enroll in FEHB at any future open season, but losing FEHB permanently is irreversible.

Worked example: Linda, age 60, federal program analyst

Linda (born 1966, MRA = 57) spent 30 years as a GS-14 federal program analyst. She retires at 60 under the 60+20 rule — early enough to trigger the FERS Supplement, but not subject to the MRA+10 early-out penalty (she has 30 years of service).

• High-3 average salary: $98,000
• TSP balance: $640,000 (75% traditional, 25% Roth)
• SS estimated benefit at FRA (67): $2,600/month
• SS if delayed to 70: $3,224/month (+24% over FRA)
• FEHB plan: BCBS Self Plus One, enrolled 12+ years

Phase 1: Ages 60–62 (supplement active)

FERS annuity: 1% × $98,000 × 30 = $29,400/year ($2,450/month)
FERS Supplement: $2,600 × (30/40) = $1,950/month = $23,400/year
Total guaranteed income: $52,800/year before TSP

If Linda's spending target is $80,000/year, she needs only $27,200 from her TSP in Phase 1 — about 4.3% of the $640,000 balance. She uses this window to do Roth conversions at the 12% bracket margin, shifting traditional TSP dollars to a rollover IRA and then to Roth IRA before age 62 when income rises.

Phase 2: Ages 62–70 (supplement gone, SS not yet claimed)

At 62 the $23,400 supplement terminates. Linda increases TSP distributions to $50,000/year to maintain her spending target with the pension ($29,400 + $50,600 ≈ $80,000). TSP withdrawal is now $50,000 vs. $27,200 — a $22,800 increase that stays within the 22% bracket and below the single-filer IRMAA Tier 1 threshold of $109,000, so Medicare premiums remain at base Part B rate.⁸

She continues Roth conversions in this phase only at the margin — the additional $50,000 TSP draw leaves less headroom, but she targets the 12%–22% bracket boundary each year.

Phase 3: Age 70+ (SS starts)

Linda's SS at 70: $3,224/month = $38,688/year.
Total guaranteed income at 70: $29,400 (FERS) + $38,688 (SS) = $68,088/year — just $11,912 short of her $80,000 target from guaranteed sources. She needs far less from TSP, reducing sequence risk and RMD pressure.

TSP balance at 70 (after 10 years of distributions and growth): roughly $550,000 in the traditional account. RMD at age 73 using a 26.5 IRS ULT divisor: ~$20,755/year. Combined with her pension + SS, total income at 73 is roughly $89,000 — entirely within the IRMAA Tier 1 threshold for single filers. Her prior Roth conversions have reduced the traditional TSP enough to keep RMDs manageable.

Where a specialist makes the difference

FERS retirement income involves several decisions that interact in ways a spreadsheet can't fully capture:

• Survivor annuity election: Choosing the level of survivor benefit for a spouse is irreversible at retirement. The tradeoff: reducing your monthly pension (typically 10–25% reduction) vs. protecting your spouse's income for decades.
• TSP rollover timing and order: When to roll TSP to an IRA, and in what order (traditional vs. Roth TSP), determines your Roth conversion flexibility, RMD timeline, and IRMAA exposure for years afterward.
• FERS cliff coordination: Sizing the TSP distribution increase at 62 to replace the supplement — while staying inside IRMAA and bracket boundaries — requires modeling your full income picture across all sources.
• FEHB vs. Medicare Part B tradeoff: The right answer depends on your specific plan, health status, spouse coverage, and whether you value zero cost-sharing over the Part B premium savings.