Social Security Claim Age Optimizer: 62, FRA, or 70?

Why the claim-age decision is bigger than most people think

Per SSA program data, claiming at 62 versus 70 changes your monthly check by ~76% for someone born after 1960 (factor 0.70 at 62 vs 1.24 at 70 on the same PIA). Compounded over a 20-30 year retirement, that translates into a six-figure swing in lifetime payout for a middle-of-the-road benefit. Yet roughly a third of SSA retirees still claim at 62 — the earliest age — and only ~6% delay all the way to 70 (Center for Retirement Research at Boston College, 2023 analysis).

The right answer depends almost entirely on three inputs you control: how long you expect to live, how much you trust future SSA payments versus money in your pocket today (your real discount rate), and whether you have other income sources that can bridge a gap from 62 to 70. This tool lets you wiggle all three and see the breakeven shift in real time.

How the math works

SSA applies two adjustments to your Primary Insurance Amount (PIA) depending on when you claim relative to your Full Retirement Age (FRA):

1. Early claim reduction: 5/9 of 1% per month for the first 36 months early (= 6.67%/year), then 5/12 of 1% per month beyond that (= 5%/year). FRA 67, claim at 62 → factor 0.70 (−30%).
2. Delayed Retirement Credits (DRC): 2/3 of 1% per month past FRA, capped at age 70 (= 8%/year). FRA 67, claim at 70 → factor 1.24 (+24%). No additional credits past 70.
3. Lifetime present value = monthly benefit × present-value-annuity factor over your expected remaining months, discounted at your chosen real rate.
4. The "best" claim age is whichever of 62, FRA, or 70 maximizes this present value under your assumptions.

Source: SSA early/late retirement factors, SSA Period Life Table, and Center for Retirement Research at Boston College 2023 claim-age behavior data.

What this tool doesn't model (yet): spousal benefits (50% of higher earner's PIA at FRA, reduced for earlier claim), survivor benefits (100% of deceased spouse's benefit, claimable from 60), the earnings test ($1 withheld per $2 earned above ~$22,320 in 2024 if claiming before FRA), federal taxation of benefits (up to 85% taxable depending on provisional income), Medicare Part B premium increases at higher incomes (IRMAA), Government Pension Offset (GPO) and Windfall Elimination Provision (WEP) for federal/state pensioners, divorced-spouse benefits, and changes to SSA's full COLA assumption.

Math runs locally. Inputs never leave your browser. Source on github.

When the tool's "best" answer will mislead you

• You're the higher earner in a married couple. Your decision sets the floor on your spouse's survivor benefit. If you die first and your spouse lives 10+ years past you, delaying your claim to 70 buys her/him a much larger lifetime check — even if your own breakeven analysis favors claiming earlier. Run this tool with longevity = spouse's expected age, not yours.
• You plan to keep working between 62 and FRA. The SSA earnings test withholds $1 of benefits for every $2 earned above ~$22,320 (2024 limit, before FRA). The withheld amount is added back as a benefit boost at FRA, but the cashflow disruption is real. If you'd just be having SSA claw back most of the check anyway, claim later instead.
• You have a known health condition. The tool uses a single longevity assumption. SSA actuarial averages don't apply if you have a serious cardiac, oncology, or neurodegenerative diagnosis. Drop the longevity number to match your honest estimate — claiming at 62 often wins under realistic numbers in this case.
• You'd otherwise burn down a tax-advantaged account to bridge to 70. Delaying SSA means drawing more from 401(k) / IRA accounts in your 60s. That can push you into higher tax brackets, trigger Medicare IRMAA surcharges, and forfeit the tax-deferred growth. The pure PV comparison misses these second-order tax costs.

What to actually do with this number

1. Pull your real PIA from my Social Security — don't guess. Re-run the tool with that exact number.
2. Set longevity honestly. SSA's period life table is the baseline; adjust up if you have long-lived parents, down for known health conditions. A 62-year-old female with no chronic conditions has a meaningfully different expected lifespan than the average.
3. Try discount rates of 1%, 3%, and 5% (all real). If 70 wins at all three, delaying is robust. If it only wins at the lowest rate, the decision is sensitive — pair it with a fiduciary planner conversation.
4. If married, run the tool twice: once with your longevity, once with your spouse's. The higher earner should typically optimize for the survivor scenario, not their own breakeven.
5. Decide before age 62 if possible. Once you claim, you have 12 months to withdraw the application (and pay back what you received). After 12 months it's locked in, with only one limited "voluntary suspension" option available at FRA.