At 56 With $940,000 Saved and a Stable Federal Job, the Math Tilts Toward Working Six More Years Than Most Calculators Suggest

A 56-year-old GS-13 federal employee covered by FERS, with 28 years of service and $940,000 in the Thrift Savings Plan, can run the numbers through most retirement calculators and receive a favorable result. Using a straightforward approach, a 4% withdrawal rate on the TSP balance would generate approximately $37,600 annually, while a projected FERS pension of about $35,000 would bring total gross retirement income to roughly $72,600 per year. However, standard retirement calculators are often designed for private-sector workers and may overlook several federal retirement provisions that can affect lifetime income by tens of thousands of dollars.

Questions like this appear regularly on federal employee retirement forums. In one recent discussion, a federal worker asked whether it was worthwhile to remain employed long enough to qualify for the higher FERS pension multiplier available at age 62. Another commenter highlighted the key issue, noting that employees retiring before age 62 generally receive a 1.0% pension multiplier, while those retiring at age 62 or later with sufficient service qualify for a 1.1% multiplier. Understanding how that difference affects long-term retirement income is often central to the decision of whether to retire now or continue working for a few more years.

The Snapshot

• Age and tenure: 56 years old, 28 years of FERS service, GS-13
• Assets: $940,000 TSP balance, FEHB-enrolled, eligible for FERS Supplement at 62
• Core tension: Retiring now triggers a permanently smaller pension and forfeits compounding on a six-figure deferred-tax base
• What’s at stake: Roughly $16,000 a year in pension income for life, plus a $500,000-plus swing in the TSP

Where the calculators go wrong

The pension formula is the headline issue. FERS pays 1.0% per year of service times the high-3 average salary if you retire before 62, and 1.1% per year if you retire at 62 or later with at least 20 years of service. That 10 basis points is decisive. Working six more years pushes service from 28 to 34 and flips the multiplier, so the annual pension moves from roughly $35,000 to roughly $51,000, a $16,000 raise that is COLA-adjusted for life.

FERS COLAs track CPI, and current inflation supports realistic assumptions. The Consumer Price Index hit 332.4 in April 2026, with Core PCE running at 129.63 in April 2026, still above the Fed’s 2% target. A 2% to 3% annual COLA on that bigger base compounds meaningfully across a 30-year retirement.

The second lever is health insurance. To keep the federal premium subsidy in retirement, an employee must have five consecutive years of FEHB enrollment immediately before retirement, and the subsidy itself is worth $8,000 to $10,000 a year. Walking away early without verifying that five-year window can vaporize the entire 4% withdrawal advantage.

The third lever is compounding. At a 7% blended growth assumption, $940,000 grows to roughly $1.41 million in six years, and continued $24,500 annual deferrals push the balance above $1.5 million. The current 10-year Treasury near 4.5% and a 3.75% upper-bound fed funds rate validate that the 7% TSP assumption already embeds a sensible equity risk premium.

Three paths, ranked honestly

1. Work to 62 (best for most people in this seat). Locks in the 1.1% multiplier, secures the FERS Supplement bridge until Social Security, preserves the FEHB subsidy, and converts $940,000 into $1.5 million-plus. The 2026 TSP catch-up of $8,000 on top of the $24,500 base turns these final years into the highest-leverage savings window of a career.
2. MRA+10 retirement now. Eligible at 56, but the pension is permanently stuck at the 1.0% multiplier and the FERS Supplement is forfeited. The 4% rule on $940,000 sounds workable until a sequence-of-returns shock hits in years one through five. With the national savings rate already compressed to 3.7% in Q1 2026, there is no household buffer to absorb a bad market.
3. Split the difference at 60. Captures two more years of high-3 salary growth but still misses the 1.1% multiplier. Acceptable only if health, caregiving, or job conditions force the issue.

Do these three things first

Pull a current FEHB enrollment history from your agency benefits office and confirm the five-year continuous window is unbroken. One administrative gap is the single most common way federal retirees accidentally lose the subsidy.

Max the TSP catch-up immediately. At 56, the $32,500 combined limit in 2026 is available, and the super catch-up of $35,750 unlocks at ages 60 to 63. These six years are the last chance to use it.

Model the FERS Supplement against delayed Social Security. Claiming the Supplement at 62 while letting Social Security grow until 70 is usually the higher-lifetime-income path, and it is a calculation worth running with a fee-only fiduciary specifically because the OPM Supplement earnings test and Social Security delayed retirement credits interact in ways generic calculators do not model.