FERS employees pay into Social Security their entire careers. Deciding when to claim — at 62, at your full retirement age, or as late as 70 — can mean a difference of 76% in your monthly benefit. Here's the framework for making that call.
Unlike CSRS employees who were exempt from Social Security, FERS employees pay into Social Security their entire federal careers and are entitled to a full benefit. That means one of the most valuable retirement decisions you'll make is when to start collecting it.
Age 62 — the earliest option. You can claim Social Security as early as 62, but your benefit is permanently reduced compared to what you'd receive at your full retirement age. The reduction is roughly 6.7% per year for the first three years early, then 5% per year after that.
Full Retirement Age (FRA) — your baseline. Your FRA is determined by your birth year:
| Birth Year | Full Retirement Age |
|---|---|
| 1943–1954 | 66 |
| 1955 | 66 and 2 months |
| 1956 | 66 and 4 months |
| 1957 | 66 and 6 months |
| 1958 | 66 and 8 months |
| 1959 | 66 and 10 months |
| 1960 or later | 67 |
Most of today's federal workforce — anyone born in 1960 or later — has an FRA of 67.
Age 70 — maximum benefit. Delaying past your FRA earns you an 8% annual increase (called delayed retirement credits) up until age 70, after which there's no additional benefit to waiting. Claiming at 70 instead of 62 increases your monthly benefit by approximately 76% to 77% depending on your birth year.
Here's where the federal employee's situation differs from a typical private-sector worker: if you retire before 62 under a full (unreduced) FERS retirement, you receive the FERS Supplement — a monthly payment that approximates your Social Security benefit for your FERS-covered years.
This supplement continues until you turn 62. It isn't reduced by delaying Social Security — you receive it regardless of when you plan to claim. That means:
This is a meaningful structural advantage for FERS retirees over private-sector workers who must decide between drawing down savings or claiming early.
For years, the Windfall Elimination Provision (WEP) and Government Pension Offset (GPO) reduced Social Security benefits for federal employees with government pensions. Both were fully repealed by the Social Security Fairness Act, signed in January 2025.
This changes the calculation significantly. FERS employees can now expect their full, unreduced Social Security benefit with no offset for their FERS pension. If you've been running retirement projections that included WEP or GPO reductions, update them — your benefit is likely higher than you thought.
Breakeven age: Claiming later means a higher monthly check but fewer years of payments. The breakeven point — where total cumulative benefits from a later start date surpass cumulative benefits from an earlier start — is typically around age 78–82. If you expect to live past that age, delaying is mathematically advantageous. If you have significant health concerns, claiming earlier may make more sense.
Other income sources: If your FERS pension, FERS Supplement, and TSP withdrawals already cover your spending, delaying Social Security costs you nothing in lifestyle terms. The delay simply means a higher guaranteed income floor later.
Spousal benefits: A surviving spouse receives the higher of their own benefit or the deceased spouse's benefit. If you're the higher earner in your household, delaying your Social Security maximizes the survivor benefit for your spouse — potentially the most important consideration in the entire claiming decision.
Medicare: Social Security and Medicare Part A enrollment are coordinated. Delaying Social Security does not delay Medicare eligibility (that's still age 65), but enrolling in Medicare Part B while not receiving Social Security requires proactive sign-up to avoid late enrollment penalties.
Taxes in retirement: Social Security benefits may be partially taxable (up to 85%) if your combined income — adjusted gross income plus half of Social Security — exceeds the threshold ($34,000 single, $44,000 married). Larger Social Security benefits may push more of your retirement income into taxable territory.
An employee who retires at 57 (MRA+30) with a $2,000/month FERS pension and a $900/month FERS Supplement has $2,900/month in retirement income until age 62. At 62, the supplement stops. The decision:
For most federal employees with a pension, supplement, and TSP balance, delaying Social Security to at least FRA — or ideally 70 — is the highest-return "investment" available.
High-3 Retirement Planner's Social Security timing tool (available in Pro) shows your estimated benefit at 62, FRA, and 70, overlaid with your pension and FERS Supplement income, so you can see exactly how each claiming age affects your monthly income at every stage of retirement.
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