Social Security Calculator

See how claiming Social Security early or late changes your monthly benefit compared to your Full Retirement Age amount.

⏱ Updated: 17 Sep 2026

Calculator

Free Social Security calculator: see how claiming before or after your Full Retirement Age changes your monthly benefit.

Adjusted Monthly Benefit
$
% of FRA Benefit
%
Adjusted Annual Benefit
$

Enter your Full Retirement Age benefit and a claiming age to see how early or delayed claiming adjusts your monthly Social Security benefit.

How to Use the Social Security Calculator

Three fields feed the adjustment: your FRA benefit amount, your actual Full Retirement Age (66 or 67 for most people claiming today), and the age you're testing as a claiming date, clamped between 62 and 70. Move the claiming age up or down and the adjusted benefit recalculates against however many months separate it from FRA — nothing else in the calculation changes.

That first number has to come from you, not this tool. The Social Security Administration calculates your FRA benefit from your full lifetime earnings history — thirty-five years of indexed wages run through a formula this calculator has no way to replicate responsibly. Pull the actual figure from your Social Security statement, available through a mySocialSecurity account at ssa.gov, and treat everything below as answering one narrower question: given that number, how does timing change it?

Early Claiming Costs More Than It Looks Like It Should

Claim before FRA and the reduction isn't a flat percentage per year — it's steeper for the first 36 months early, then eases off:

First 36 months early:   reduce by 5/9 of 1% per month
Each month beyond that:  reduce by 5/12 of 1% per month
Each month delayed past FRA (up to age 70): increase by 2/3 of 1% per month

Claim exactly three years before FRA and you've given up 20% (36 × 5/9%). Claim a fourth year early and that additional year costs proportionally less — 5/12% per month instead of 5/9% — but it still adds up. Delay instead, and each month past FRA adds 2/3 of 1%, which compounds to 8% for every full year you wait, up until 70; delaying beyond 70 earns nothing further, which is why the claiming age here caps there.

These reduction and credit rates are long-standing SSA policy, not annual IRS adjustments — they haven't changed in decades and aren't expected to, unlike the dollar figures elsewhere in Social Security's rules.

There's no universally "right" claiming age — it's a bet on your own life expectancy and cash-flow needs, not just an arithmetic exercise. Someone in poor health with no other income has a real reason to take the smaller check at 62; someone healthy with other savings to lean on in the meantime has just as strong a reason to wait for the larger one at 70.