Social Security Claiming Age: Method

Social Security Claiming Age: How It Works

What it does

A U.S. Social Security retirement benefit can be claimed at any month from age 62 to age 70. The earlier it starts, the smaller the monthly amount for life. The page shows the monthly benefit at each claiming age, the age at which a later claim has paid as much in total as an earlier one (the break-even age), and the total and present value of each choice up to an age you enter. It describes the rules and the arithmetic. It does not say when to claim.

The method

Symbols. B_F is the monthly benefit at full retirement age, which the Social Security Administration calls the primary insurance amount; c the yearly cost-of-living increase; d the yearly discount rate; k the number of months since the 62nd birthday. Rates are used as decimals: 2.5 % is 0.025.

Full retirement age (20 CFR 404.409) depends on the year of birth: 65 for 1937 and earlier; 65 and 2, 4, 6, 8, 10 months for 1938 to 1942; 66 for 1943 to 1954; 66 and 2, 4, 6, 8, 10 months for 1955 to 1959; 67 for 1960 and later. A person born on 1 January counts with the year before.

Claiming early (20 CFR 404.410). For m months before full retirement age the benefit is reduced by R percent:

R = (5/9) × min(m, 36) + (5/12) × max(m − 36, 0),   benefit = B_F (1 − R / 100)

Claiming late (20 CFR 404.313). For m months after full retirement age, counted only up to age 70, a delayed retirement credit of C percent is added. The credit is 2/3 of 1 % a month for people born in 1943 or later (8 % a year); the regulation gives smaller credits for earlier years of birth and the page uses them.

C = (2/3) × m,   benefit = B_F (1 + C / 100)

Cost-of-living increases. From age 62 the benefit is raised by each cost-of-living increase whether or not it has been claimed (20 CFR 404.212). The page applies one increase of c on each birthday after 62, so the payment for month k is the benefit above times (1 + c)^y, y being the whole years since 62.

Break-even age. For two claiming ages the page adds each stream of payments month by month and reports the first age at which the later claim's total is at least the earlier one's. With no cost-of-living increase and no discounting this has a closed form: an earlier benefit B_A paid g months before the later benefit B_B starts is caught up n = B_A g / (B_B − B_A) months after the later claim.

Present value. A payment t = k / 12 years after age 62 is divided by (1 + d)^t. The present value of a choice is the sum of its discounted payments up to the entered age; the discounted break-even age compares these sums in place of the plain totals.

Benefit from earnings (Advanced) (20 CFR 404.212; Federal Register, 3 November 2025). With average indexed monthly earnings E and the bend points b₁ and b₂ of the year the person turns 62:

B_F = 0.90 × min(E, b₁) + 0.32 × (min(E, b₂) − b₁) + 0.15 × (E − b₂), each bracket counted only when positive, rounded down to the next 10 cents.

The bend points change every year, so they are inputs. The defaults, 1,286 and 7,749, are those for people who turn 62 in 2026.

Spouse and survivor (Advanced). A spouse's benefit on the worker's record is at most one half of B_F (20 CFR 404.333) and is not raised by the worker's delayed credits (404.313). The spouse's own benefit is paid first and the worker's record pays the difference between the half and the spouse's own full benefit (404.407, 404.411). Claimed m months before the spouse's full retirement age, that difference is reduced by (25/36) × min(m, 36) + (5/12) × max(m − 36, 0) percent (404.410). After a death the survivor keeps the larger benefit. A widow or widower at full retirement age is paid what the worker was receiving with delayed credits, or, when the worker claimed early, the larger of the reduced amount and 82.5 % of B_F (404.338).

What it assumes

The benefit at full retirement age is known and does not change with further work. The same cost-of-living increase every year, applied on the birthday; the real increase is set each year from price data and takes effect in December. Claims on a birthday (the table) or at full retirement age. Payments counted in the month they are due. One discount rate for all years. Benefits stop at the entered age. Amounts are not rounded as the Administration rounds them. No income tax on benefits, no Medicare premiums, no earnings test (benefits claimed before full retirement age are held back while earnings from work exceed a yearly exempt amount, 20 CFR 404.415), no limit on family benefits. In the two-person comparison the survivor has reached the full retirement age for widow's and widower's benefits and both people have claimed.

When it misleads

Nobody knows the age to compare to. The break-even age is a fact of the rules; whether a person lives past it is not. The Social Security Administration publishes period life tables with the average remaining years of life at each age, but an average says little about one person, and half of any group lives longer than its median.

A break-even age treats the benefit as an investment. A benefit that lasts for life and rises with prices also works as insurance against living a long time. A total or a present value up to a fixed age does not count that.

The discount rate decides a great deal. A high rate favours early payments and a low one later payments. There is no single correct rate; the table changes order as it moves.

Two people are not one. For a couple the larger benefit is paid until the second death, so a single-person break-even age understates how long the larger earner's benefit may be paid. The Advanced table shows the amounts; it does not add up two lifetimes.

The law can change, and special cases are left out. Disability, children's benefits, divorced spouses, work after claiming and pensions from work not covered by Social Security all follow rules this page does not model.

Worked example

The default case: 2,000 a month at full retirement age, born in 1964, cost-of-living increase 2.5 %, discount rate 4 %, compared to age 85.

Full retirement age for 1964 is 67. Age 62 is 60 months early: R = 36 × 5/9 + 24 × 5/12 = 20 + 10 = 30 %, so the benefit at 62 is 2,000 × 0.70 = 1,400. Age 70 is 36 months late: C = 36 × 2/3 = 24 %, so the benefit at 70 is 2,000 × 1.24 = 2,480.

Break-even, 62 against 67, no increases: by 67 the early claim has paid 1,400 × 60 = 84,000; the later claim gains 600 a month, so it catches up after 84,000 / 600 = 140 months, at age 78 years 8 months. With 2.5 % increases the month-by-month sums cross at 76 years 9 months; discounted at 4 %, at 80 years 4 months. For 67 against 70 the three ages are 82 years 6 months, 80 years 7 months and 84 years 2 months.

To age 85 the claim at 62 pays 276 months, 513,818 in total with a present value at 62 of 324,989; the claim at 67 pays 216 months, 607,874 and 349,751; the claim at 70 pays 180 months, 650,206 and 353,312.

An illustration of general rules, not tax, legal or benefits advice. A calculator for education and analysis, not investment advice.