FERS Retirement Planning: The Federal Employee's Complete Guide

FERS is different from every other pension. There is no lump-sum option for your basic annuity — you must take it as a monthly benefit. But that doesn't mean the decisions are simple. The survivor election is permanent and irreversible. The FERS Supplement ends at 62 no matter what. Your TSP rollover decision unfolds on a different track entirely. Federal employees who work with a fee-only specialist before submitting their retirement paperwork consistently make better decisions than those who don't.

The three-part FERS benefit

FERS replaced CSRS for employees hired after 1983. It has three separate components that need to be planned together:

• FERS Basic Annuity — your traditional pension, calculated from your high-3 salary and years of service. Paid monthly for life. COLA-adjusted (with a "diet" formula explained below).
• Thrift Savings Plan (TSP) — your defined contribution account. You control investments; at retirement you decide whether to keep it in TSP, roll it to an IRA, or take distributions. This is the piece that resembles a 401(k) rollover decision.
• Social Security — you earn SS credits under FERS (unlike CSRS). If you retire before 62, a bridge payment covers the gap: the FERS Supplement.

FERS retirement eligibility: when can you start?

Three immediate, unreduced paths — plus a reduced option if you need to retire earlier:

Minimum Retirement Age (MRA) by birth year

Your MRA is set by the year you were born — it does not change.¹

How your FERS annuity is calculated

The basic formula uses your high-3 average salary — the highest average basic pay over any 3 consecutive years (usually the last 3).²

Standard formula (most retirees):

Annual annuity = 1% × high-3 salary × years of creditable service

Premium formula (age 62+ with 20+ years):

Annual annuity = 1.1% × high-3 salary × years of creditable service

Unused sick leave is credited as service time at retirement. An employee with 6 months of unused sick leave receives the equivalent of 6 additional months toward their annuity calculation.

The FERS Supplement: Social Security before age 62

If you retire before age 62 via the MRA+30 or age-60+20 path, you receive the FERS Supplement (formally: the Retiree Annuity Supplement) until you turn 62. It approximates the Social Security benefit you earned through federal service.³

How it's calculated:

FERS Supplement ≈ (FERS years ÷ 40) × estimated SS benefit at age 62

Earnings test applies: The FERS Supplement is subject to a Social Security-style earnings test. If you take post-retirement employment and earn above the annual threshold (adjusted each year by SSA; roughly $23,000–$24,000 in recent years — verify current year at SSA.gov), your supplement is reduced $1 for every $2 earned above the limit. Plan your post-retirement work accordingly if you retire before 62.

Survivor benefit election: the permanent decision

At retirement, you choose how much survivor coverage to provide your spouse. This choice is largely irrevocable after the election window closes.⁴

If your spouse predeceases you, the reduction stops and your full annuity is restored.

Use the J&S Election Calculator to model the break-even for your specific situation.

TSP at retirement: keep, rollover, or annuity?

Your TSP is separate from the FERS annuity — it's your 401(k)-style account, and at retirement you have real choices:

• Keep it in TSP. TSP has among the lowest expense ratios of any retirement plan (0.042% in 2025). No need to move it unless you have a reason. Beneficiary rules and distribution options are more limited than an IRA.
• Roll to a traditional IRA. More investment options. Easier Roth conversion planning. Better stretch options for beneficiaries. Worth considering if your TSP balance is large and your estate/tax planning needs are complex.
• TSP life annuity. TSP offers a MetLife-backed annuity purchase option. Less flexible than taking withdrawals from TSP or an IRA — generally not recommended unless you want a third guaranteed income stream beyond FERS annuity + SS.

In 2026, the TSP elective deferral limit is $24,500, plus a $8,000 catch-up if you're 50 or older, or $11,250 if you're ages 60–63 (SECURE 2.0 super catch-up).⁵ If you're still working, maximize contributions in your final years — the tax-deferred compounding effect on a $300K TSP is meaningful.

FERS COLA: how inflation protection works

FERS annuities have a "diet COLA" — inflation-adjusted, but not fully indexed to CPI the way CSRS is.⁶

In 2026, FERS retirees received a 2.0% COLA (CPI was between 2–3%). CSRS retirees received the full CPI increase. Over a 25-year retirement, this difference compounds significantly — one reason FERS retirees with large annuities sometimes benefit from modeling whether a partial annuity + invested rollover (via TSP) provides better long-run inflation protection than the full annuity alone.

COLA applies only to the FERS basic annuity, not the FERS Supplement. The Supplement is fixed from day one and does not receive annual increases.

FERS vs. CSRS: if you're in the gray zone

Employees hired between January 1, 1984 and December 31, 1986 may be under CSRS Offset — a hybrid formula. If you're unsure which system governs your annuity, check your SF-50 "Retirement Plan" code. CSRS Offset employees have notably different survivor election math and cannot roll over CSRS voluntary contributions as easily as TSP balances. Get the right guidance for your specific system before making any election.

Where a specialist makes the difference

The decisions that move the needle most for FERS retirees:

• Survivor election modeling. The 10% vs. 5% vs. 0% tradeoff based on actuarial life expectancies, other income, and whether term life insurance can substitute for the survivor benefit at lower cost.
• Retirement date optimization. Retiring in January vs. December affects the COLA adjustment timing. Retiring after 30+ years vs. 29 years 11 months changes your formula multiplier if age 62+ is involved.
• TSP Roth conversion strategy. A large traditional TSP rolled to an IRA becomes a Roth conversion ladder opportunity — particularly if your income drops at retirement before RMDs or SS begins. Planning this in years 59½–72 can eliminate hundreds of thousands of dollars in lifetime RMD tax exposure.
• Social Security timing. Federal employees often have sizable SS benefits. Claiming at 62 vs. 67 vs. 70 interacts with your FERS annuity, the ending of the Supplement at 62, TSP distribution timing, and spousal SS strategies.
• FEHB and Medicare coordination. Keeping FEHB in retirement while enrolling in Medicare Part A (no premium) and optionally Part B ($174.70/month base in 2026) can reduce out-of-pocket costs — or not, depending on your plan.

Sources

1. OPM — FERS Eligibility. MRA table by birth year; retirement eligibility paths (MRA+30, 60+20, 62+5, MRA+10 reduced).
2. OPM — FERS Computation. 1% and 1.1% annuity formulas; high-3 average pay definition; unused sick leave credit. Values verified April 2026.
3. OPM — FERS Annuity Supplement Survey FAQ. Supplement formula, earnings test, annual survey process.
4. OPM — Survivor Benefits. Full 50% survivor = 10% annuity reduction; partial 25% = 5% reduction. Spousal consent required to elect no coverage.
5. IRS — 401(k)/TSP Contribution Limits 2026. $24,500 deferral; $8,000 catch-up age 50+; $11,250 super catch-up ages 60–63 per SECURE 2.0 § 109.
6. Government Executive — Federal Retirees Face New COLAs, Premiums and Earnings Limits in 2026. FERS COLA 2.0% for 2026; FERS diet-COLA formula vs. CSRS full-CPI adjustment.

FERS retirement elections (survivor benefit, retirement date) are largely irrevocable. Values verified as of April 2026 against OPM, IRS, and Government Executive publications. Consult a fee-only advisor before submitting retirement paperwork.