Social Security Spousal Benefit Calculator
The Social Security spousal benefit lets you claim up to 50% of your spouse's primary insurance amount (PIA), the benefit they would receive at their own full retirement age (FRA). If you claim before your own FRA, the Social Security Administration reduces the amount using a fixed monthly formula: 25/36 of one percent per month for the first 36 early months, then 5/12 of one percent per month beyond that. Enter the worker's PIA and how many months before your FRA you plan to claim to estimate your spousal benefit.
SSA spousal reduction formula
Full spousal benefit = spousal% x worker PIA For the first 36 early months: reduction = 25/36 of 1% per month For each month beyond 36: reduction = 5/12 of 1% per month Reduced benefit = full benefit x (1 - total reduction)
At FRA (0 early months) there is no reduction. The spousal benefit does not increase past FRA.
Worked example
Worker PIA 2,400, claiming 36 months early. Full spousal = 50% x 2,400 = 1,200. Reduction = 36 x (25/36 of 1%) = 25%. Reduced benefit = 1,200 x 0.75 = 900.00.
Spousal benefit: frequently asked questions
How much is the Social Security spousal benefit?
At full retirement age (FRA), the spousal benefit is up to 50% of the worker's primary insurance amount (PIA), which is the benefit the worker would get at their own FRA. If you claim the spousal benefit before your own FRA, the Social Security Administration reduces it using a set monthly reduction formula.
How does the early-claiming reduction work?
For the spousal benefit, the SSA reduces the 50% amount by 25/36 of one percent for each of the first 36 months before your FRA, then by 5/12 of one percent for each additional month. At FRA there is no reduction. Unlike a worker's own benefit, the spousal benefit does not earn delayed retirement credits past FRA, so claiming after FRA does not increase it.
What is the primary insurance amount (PIA)?
The PIA is the monthly benefit a worker is entitled to at their full retirement age, based on their lifetime earnings. The spousal benefit is calculated as a percentage of the worker's PIA, not of the amount the worker actually receives. Get the worker's PIA from their Social Security statement at ssa.gov/myaccount.
Can I get both my own benefit and a spousal benefit?
You receive the higher of the two, not both stacked in full. If your own retirement benefit is less than the spousal amount, the SSA effectively tops you up to the spousal level. If your own benefit is higher, you receive your own benefit instead. This calculator estimates the spousal amount on its own so you can compare.
Official sources
- Social Security Administration: Benefits For Your Spouse.
- Social Security Administration: Benefits for Spouses.
Reviewed by the CalculatorHub team, edited by James Graham, 19 June 2026. See our methodology.