Federal Employee Social Security: FERS, CSRS, and the WEP/GPO Repeal

"Do federal employees get Social Security?" is one of the most common questions federal workers have about retirement — and the short answer has two parts: yes if you're under FERS, no (from your federal service) if you're under CSRS. The longer answer requires understanding your retirement system, outside employment history, and a major 2025 law change that raised Social Security benefits for hundreds of thousands of current and former federal workers.

FERS and Social Security: You Pay, You Receive

If you were hired into the federal government on or after January 1, 1987 — or were automatically converted to FERS during the 1987 open season — you are under the Federal Employees Retirement System. FERS employees pay full Social Security (OASDI) taxes on every paycheck: 6.2% of covered wages up to the taxable maximum, matched by your agency.²

This means your entire federal career is building Social Security credits alongside your FERS pension and TSP. At retirement you have three income sources: the FERS annuity, Social Security, and your TSP. Coordinating all three — especially the timing of Social Security claiming relative to the FERS supplement — is where the real planning work lies.

There is no WEP or GPO concern for FERS employees. Your pension comes from a Social Security-covered employer, so none of the old offset rules applied to you even before the 2025 repeal.

CSRS and Social Security: It Depends on Outside Employment

Employees under the Civil Service Retirement System (generally hired before 1984 who remained on CSRS) do not pay Social Security taxes on their federal wages. Your CSRS pension accumulates at a higher multiplier (up to 2.0% per year of service) partly because it's designed to replace Social Security entirely.³

However, many CSRS employees also worked private-sector or part-time jobs during their careers where they did pay Social Security taxes. If you earned at least 40 Social Security credits from non-federal employment, you are eligible for a Social Security benefit from that work.

Before January 2025, that SS benefit was reduced by the Windfall Elimination Provision. Post-repeal, you receive the full benefit your covered earnings history supports — with no WEP reduction.

CSRS Offset: The Hybrid Case

CSRS Offset is a specific category for employees who had a break in service and were rehired between January 1, 1984 and December 31, 1986 (or who had prior CSRS service and returned after 1983). These employees pay both CSRS contributions and Social Security taxes during their CSRS Offset years.³

The mechanics at retirement:

• Your CSRS pension is calculated using the standard CSRS formula — typically higher than FERS for the same salary and years.
• You are eligible for Social Security based on your covered employment (federal CSRS Offset years plus any other SS-covered work).
• When you become eligible for Social Security, your CSRS pension is reduced ("offset") by the portion of your SS benefit attributable to CSRS Offset service. You collect both, but the offset keeps the combined amount from doubling up.

Unlike FERS employees, CSRS Offset employees do not receive the 1% automatic agency TSP contribution or the matching contributions (those are exclusively FERS benefits). You can still contribute to TSP up to the IRS annual limit ($24,500 in 2026, or $32,500 at age 50+), but without agency match.

The WEP/GPO Repeal: What Changed and Who Benefits

The Social Security Fairness Act was signed into law on January 5, 2025, eliminating two provisions that had penalized federal retirees with non-covered pension income:¹

Windfall Elimination Provision (WEP) — Repealed

WEP previously reduced Social Security benefits for workers who had a pension from non-Social Security-covered employment (like CSRS) and also earned SS benefits from other jobs. The reduction could be as large as half of the non-covered pension, which made the rule extraordinarily punishing for career switchers and retirees with mixed employment histories. WEP is now gone.

Government Pension Offset (GPO) — Repealed

GPO previously reduced spousal and survivor Social Security benefits by two-thirds of the government pension amount. For many CSRS retirees' spouses, this eliminated their Social Security spousal benefit entirely. GPO is now gone.

Who benefits most from the repeal

• CSRS retirees with SS-covered outside employment — receive the full SS benefit their covered earnings support, without any WEP reduction.
• Surviving spouses of CSRS retirees — now receive full survivor or spousal SS benefits that GPO had previously reduced or eliminated.
• CSRS Offset employees with additional outside SS employment — any WEP that applied to non-federal SS earnings is eliminated.
• FERS employees — were generally not subject to WEP or GPO; this repeal does not change their Social Security picture.

SSA is processing retroactive adjustments for affected individuals back to January 2024. If you were subject to WEP or GPO and have not received updated benefit statements or back pay, contact the Social Security Administration directly.¹

The FERS Supplement and Social Security: A Critical Interaction

Many FERS employees who retire before 62 receive the FERS Special Retirement Supplement — a bridge payment that approximates the Social Security benefit you've earned through your federal service. The supplement closes the income gap between early retirement and age 62, when Social Security eligibility begins.

Two things to know about how the supplement interacts with Social Security:

The supplement stops at 62 — regardless of when you claim SS

The FERS supplement terminates on your 62nd birthday by law.⁴ This is automatic — it does not depend on whether you claim Social Security at 62 or wait until 70. The supplement is not extended if you delay SS. You cannot receive both the supplement and Social Security at the same time.

This is the most common misunderstanding federal employees have: "The supplement stops at 62, so I need to claim SS at 62." That's wrong. The supplement stops at 62 regardless of what you do with Social Security. The question of when to claim SS is separate.

The earnings test applies to the supplement (not to TSP withdrawals)

While you're receiving the FERS supplement, earned income over $24,480 in 2026 reduces the supplement by $1 for every $2 over the limit — the same threshold as the Social Security earnings test below FRA.⁴ Importantly, TSP withdrawals, pension income, and investment returns do not count as earned income for this test. Only wages and net self-employment income count.

When to Claim Social Security as a FERS Retiree

For employees born in 1960 or later, Full Retirement Age (FRA) is 67. You can claim as early as 62 at a permanently reduced rate, or delay up to 70 for a permanently increased rate:²

Benefit percentages per SSA for FRA=67. Benefits shown in 2026 dollars; actual SS benefits are indexed for inflation via COLA.

The FERS-specific case for delaying Social Security

Many financial planners advise delaying Social Security for healthy retirees because the 8% per year delayed credit (from FRA to 70) is hard to beat. For FERS retirees specifically, the case for delay is often stronger:

• You already have stable pension income. Your FERS annuity covers a base level of income without SS. Unlike private-sector workers who may have no income at 62–67, you have a pension floor.
• TSP can bridge the SS delay gap. Drawing from TSP between 62 and 70 — instead of claiming SS early — effectively "purchases" a higher SS benefit for life. If your TSP earns 5% but the SS delay earns 8%, the delay wins mathematically for most life expectancies.
• Survivor protection. A higher SS benefit at 70 provides better protection for a lower-earning spouse. SS is the only inflation-adjusted income stream for your survivor that doesn't require a separate election cost (unlike SBP). The spousal survivor benefit is 50% to 100% of your benefit depending on circumstances — delaying grows that floor permanently.
• RMD management. Drawing TSP earlier (in exchange for delayed SS) reduces your TSP balance before Required Minimum Distributions begin at age 73 or 75, which can reduce forced taxable income and IRMAA exposure in your 70s and beyond.

When claiming at 62 makes sense for FERS retirees

• You have a health condition that significantly reduces life expectancy (the break-even age for delay vs. early claim is typically around age 79–81).
• You have no other income source and genuinely need the SS cash flow to meet expenses.
• Your TSP is your primary tax-deferred asset and you want to preserve it for Roth conversion opportunities or bequest purposes.

Social Security Taxability and Your FERS Pension

Up to 85% of your Social Security benefit is subject to federal income tax depending on your "provisional income" — a calculation that combines adjusted gross income, tax-exempt interest, and half of your Social Security benefit.⁵

These thresholds have not been indexed for inflation since 1983. A FERS retiree with a $60,000 pension, $20,000 TSP withdrawal, and $30,000 SS benefit has provisional income of $85,000 — well above the 85% threshold.⁵

The practical implication: most FERS retirees with a full pension will have 85% of their Social Security benefit taxable at the federal level. State taxation varies — most states exempt some or all Social Security from state income tax even when federal taxes apply.

IRMAA: How TSP Withdrawals Can Raise Your Medicare Premiums

IRMAA (Income-Related Monthly Adjustment Amount) surcharges apply when your Modified Adjusted Gross Income (MAGI) exceeds certain thresholds in the year two years before a given Medicare premium year. For 2026, the first IRMAA tier kicks in at $109,000 for single filers and $218,000 for married filing jointly.⁶ Crossing that threshold adds approximately $70/month per person to Part B premiums.

For FERS retirees, the danger zone is the combination of FERS pension + TSP withdrawals + Social Security + any Roth conversion income. TSP distributions are fully taxable (for traditional TSP) and count in full toward MAGI. This means a Roth conversion in the year before Medicare enrollment can trigger IRMAA surcharges two years later — a trap covered in depth in the FEHB in Retirement guide.

Social Security Claiming Age Calculator

Enter your estimated Social Security benefit at your Full Retirement Age (FRA). The calculator shows what you'd receive at 62, 67, and 70, and when break-even occurs between claiming strategies.

Putting It Together: FERS Retirement Income Coordination

For most FERS retirees, the optimal Social Security strategy fits into a broader income coordination plan. A few common patterns:

• Retire at 55, delay SS to 67 or 70. Use FERS supplement (55–62) and TSP distributions (62–67/70) to bridge. Maximizes lifetime SS income and survivor protection.
• Retire at 62, claim SS immediately. Simple, provides income floor, works if health or cash-flow constraints require it. Leaves significant lifetime SS income on the table if you're healthy.
• Roth conversion window (55–62 or 62–67). Use the low-income years before SS and/or RMDs to convert traditional TSP to Roth IRA — filling the 22% or 24% bracket without triggering IRMAA. SS taxability and Roth conversions interact: more SS + more conversions can push you to 40.7% effective marginal rate on the conversion dollar (22% bracket + 85% SS taxation at 22%). Coordinate carefully.

The 3-legged stool — FERS pension, TSP, Social Security — is powerful precisely because each leg has different tax treatment, inflation adjustment, and survivor properties. Getting the interaction right is where a fee-only advisor who specializes in federal retirement earns their fee.

1. SSA.gov — Social Security Fairness Act (WEP/GPO Repeal), effective January 2025
2. SSA Publication 05-10024 — Retirement Benefits (FRA table, delayed credits, early claiming reductions)
3. OPM — Civil Service Retirement System (CSRS) and CSRS Offset overview
4. OPM — FERS Special Retirement Supplement: eligibility, earnings test, and termination at age 62
5. IRS Publication 915 — Social Security and Equivalent Railroad Retirement Benefits (provisional income thresholds)
6. Medicare.gov — Part B costs and IRMAA surcharge tiers for 2026

Values verified against SSA.gov, OPM, and Medicare.gov as of May 2026. IRMAA thresholds: $109,000 single / $218,000 MFJ for 2026 per CMS. SS provisional income thresholds per IRC §86 (unchanged since 1983).