Methodology and formula for claiming-age factors.
For birth years 1943 through 1954, full retirement age is 66. It rises by two months for each birth year from 1955 through 1959, then reaches 67 for people born in 1960 or later. That cohort difference matters when comparing the same claiming age.
Benefits before full retirement age are reduced by months.
The estimate applies the standard retirement reduction of 5/9 of 1% for each of the first 36 months before full retirement age and 5/12 of 1% for each additional earlier month. This is why an FRA-67 worker claiming at 62 receives about 70% of PIA.
Delayed credits depend on months after full retirement age.
For the supported 1943-and-later cohorts, delayed retirement credits are 8% per year, or 2/3 of 1% per month, through age 70. A person born in 1956 has a full retirement age of 66 years 4 months, so claiming at 70 is about 129.3% of PIA rather than 124%.
Use your SSA record for the decision.
This estimator does not calculate PIA from earnings, decide eligibility, model spousal or survivor benefits, apply work deductions, taxation, COLAs, Medicare premiums, disability rules, or the exact effective month of a claim. Month-of-birth details can change the exact factor; use SSA tools and your current record before filing.
Verify the rules with the Social Security Administration.
FigureNest uses these official pages to explain the claiming-age adjustment. Rules and individual records can change, so verify your decision with SSA before filing.
Social Security Administration — Full retirement age (opens in a new tab)
Social Security Administration — Delayed retirement credits (opens in a new tab)
Social Security Benefit Estimator questions.
Why does birth year matter?
Full retirement age is not 67 for every cohort. It is 66 for 1943–1954, increases gradually for 1955–1959, and is 67 for 1960 and later.
Can I claim at 70 and get more than 124%?
Yes for some cohorts. For example, SSA shows about 129.3% of the full-retirement benefit at age 70 for someone born in 1956 because that person’s full retirement age is 66 years 4 months.
Does this replace an SSA estimate?
No. Use it to understand the claiming-age adjustment to a PIA you already have, then verify the filing decision with your Social Security record and official SSA tools.
Why does the calculator accept only whole claiming ages?
The estimator is intentionally a planning comparison at whole ages from 62 through 70. Social Security adjustments are actually month-sensitive, so a filing decision between birthdays can produce a different factor. Use your SSA record for the exact effective month.
What should I enter for PIA?
Enter the monthly primary insurance amount from your Social Security record, not your current salary or an expected take-home amount. The calculator applies the claiming-age factor to that PIA; it does not rebuild PIA from your earnings history.
What if I was born on January 1?
SSA generally treats a person born on January 1 as attaining an age on the preceding day, which can make the previous birth year relevant to full retirement age. Verify this edge case with SSA rather than relying on the birth-year-only estimate here.