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The benefit starts from a progressive formula on average indexed monthly earnings: 90% of the first bend point, 32% of the next band and 15% above it. Claiming before full retirement age reduces it permanently, while delaying adds roughly 8% a year.
Benefit formula
PIA = 90%×first band + 32%×second band + 15%×remainder, then adjust for claiming age
Figures are estimates for planning only. Market returns are not guaranteed, and rates, limits and tax rules change. This is not financial or tax advice — speak to a qualified adviser before acting.
It deliberately replaces a larger share of income for lower earners.
Delaying raises the monthly amount for life, so it pays off if you live beyond roughly your early eighties.