When to Claim Social Security: The Break-Even Math

Here is the thing that made me sit up when I first worked it out on a napkin. Social Security is not a pot of money you draw down. It is an annuity whose size you set, once, on the month you file, and then never get to change. File at 62 and you take a permanent 30% pay cut. Wait until 70 and you take a permanent 24% raise.^[1,3] The check at 70 is 77% bigger than the check at 62, forever, and it is the same person with the same work history.

Most of the writing about this decision is vibes. Take it early because you might die. Wait because you might live. Both are true and neither is useful. The good news is that the crossover point between those two strategies is not an opinion. It is four lines of arithmetic on numbers the Social Security Administration publishes, and you can do it in the time it takes to finish a coffee.

The bad news, and this is the part I want you to leave with, is that once you compute it you discover the break-even lands almost exactly on your life expectancy. Which means the math is a coin flip, and the decision has to be made on something else.

First, the two numbers the whole thing runs on

Two terms, and then we can move. Your primary insurance amount (PIA) is the monthly benefit you would get if you filed at exactly your full retirement age. It comes out of your 35 highest indexed earning years, and nothing about the claiming decision changes it. Your full retirement age (FRA) is set by the year you were born, and it is not 65 anymore for anybody still working.

The Social Security Administration's own table is short. Born 1943 to 1954, your FRA is 66. Born 1955 through 1959, it steps up two months a year. Born 1960 or later, it is 67.^[1] That last row covers everyone under 66 today, so unless you are already collecting, 67 is your number.

Everything else is an adjustment applied to the PIA based on how many months early or late you file. Which is the part nobody shows you.

The formula, which is weirder than you think

The reduction for filing early is not linear. The Office of the Chief Actuary states it precisely: the percentage reduction is 5/9 of 1% per month for the first 36 months before your full retirement age, and 5/12 of 1% for each additional month.^[2]

Run that for someone born in 1960 or later, filing at 62. That is 60 months early. The first 36 months cost 36 times 5/9 of 1%, which is 20%. The remaining 24 months cost 24 times 5/12 of 1%, which is 10%. Total: exactly 30%.^[1] The kink at 36 months means the first three years of waiting are worth more per month than the last two, at 0.556% against 0.417%. If you are going to claim early anyway, the months closest to your FRA are the cheapest ones to give up.

Going the other way is simpler. Delayed retirement credits accrue at 2/3 of 1% per month, which is 8% a year, for everyone born in 1943 or later.^[3] They start the month after your FRA and they stop dead at 70. Not reduced after 70. Zero. Delaying past your 70th birthday buys you nothing at all, and people do it every year.

The break-even, worked out

Take a $2,000 PIA and an FRA of 67, because that is the modern default. Three options: $1,400 at 62, $2,000 at 67, $2,480 at 70.

Start with 62 against 67. By the time the age-67 filer gets their first check, the age-62 filer has banked 60 checks of $1,400, which is $84,000. That is the head start. From 67 on, the later filer gains $600 every month. Divide: $84,000 divided by $600 is 140 months, or 11 years and 8 months. Add that to 67 and the crossover lands a few months short of your 79th birthday.

Now 67 against 70. The head start is 36 checks of $2,000, so $72,000. The monthly gap is $480. That is 150 months, or 12 and a half years, putting the crossover at about age 82 and a half.

And the one most people actually care about, 62 against 70. Head start is 96 checks of $1,400, so $134,400. The gap is $1,080 a month. That is 124 months, which is 10 years and 4 months past 70, so roughly age 80 and 4 months.

Inflation quietly moves the finish line

Here is the part the napkin version misses. Social Security applies a cost-of-living adjustment to everyone from age 62 onward, whether or not you have filed. The 2026 COLA was 2.8%.^[5] Since that percentage lands on a bigger base for the delayer, the dollar gap between the two streams widens every single year.

I re-ran the same three comparisons month by month with a 2.8% annual adjustment applied to both streams. The 62-versus-70 crossover moves from about 80 years 4 months to about 78 years 3 months. The 62-versus-67 crossover moves from just under 79 to about 76 and a half. Roughly two years earlier across the board.

The honest counterweight: if you take the early checks and actually earn a real return on them, that pushes the crossover back out. At a 2% real return the 62-versus-70 break-even goes to about 82 years 8 months, and at 4% real it goes to about 86 and a half. So the fair summary is that the crossover sits somewhere between 78 and 86 depending on assumptions you cannot verify in advance. Anyone quoting you a single break-even age to the month is selling something.

Three things that move the decision more than the break-even does

This is where I think most of the internet gets the emphasis wrong. The crossover date is the headline, and it is the least decision-relevant number in the whole analysis. These three are worth more.

1. The earnings test, if you are still working

Claiming at 62 while holding a job is the single most common expensive mistake here. In 2026, if you are under full retirement age for the entire year, Social Security deducts $1 from your benefits for every $2 you earn above $24,480.^[4] In the year you reach FRA the limit jumps to $65,160 and the deduction eases to $1 for every $3, counting only what you earn before the month you hit FRA. After that month, no limit at all, however much you make.

The nuance people miss: the withheld money is not confiscated. At full retirement age Social Security recalculates your benefit to credit the months that were withheld.^[4] So the earnings test is closer to a forced deferral than a penalty. It still means that filing at 62 while earning $80,000 mostly generates paperwork and a smaller permanent base.

2. The survivor benefit, which makes this a joint decision

This is the one that changed how I think about the whole question. A surviving spouse at their own full retirement age receives 100% of what the deceased worker was receiving or was entitled to.^[8] Read that again with a married couple in mind. The higher earner is not picking a benefit for themselves. They are setting a floor under whichever of the two of them lives longer, which is usually a stretch of ten or fifteen years at the end when one income has already stopped.

And there is a rule underneath it with teeth. Under the 1972 amendments, the widow's benefit is limited to the greater of what the deceased worker would be receiving if alive, or 82.5% of the primary insurance amount, so the maximum haircut is 17.5%.^[9] The SSA's own research put a number on how often that bites: where the deceased was a retired worker, widows have their benefits reduced by this limit 59.3% of the time, with a median reduction of 17.5%, the full amount allowed by law.^[9] Delayed retirement credits run the other direction and pass through to the survivor.

3. Taxes, because up to 85% of the check is taxable

Social Security uses a measure it calls combined income: your adjusted gross income, plus nontaxable interest, plus half your benefits. File as an individual with combined income between $25,000 and $34,000 and up to 50% of your benefits become taxable; above $34,000 it is up to 85%. For a joint return the bands are $32,000 to $44,000 and above $44,000.^[6,7]

The detail that matters: those thresholds are written into statute in nominal dollars and have never been indexed to inflation. They are the same numbers today that they were when Congress wrote them, while every COLA pushes more retirees over them. So a bigger delayed benefit is partly taxable in a way that arithmetic ignores, which argues mildly for claiming earlier. A large traditional 401(k) that starts throwing off required distributions argues instead for using the years between 62 and 70 to do Roth conversions while your taxable income is low, which argues for delaying. It cuts both ways and it depends entirely on the rest of your balance sheet.

So what would I actually do

Start with the number that reframes all of it. On the Social Security actuaries' period life table, a 62-year-old man has 20.3 years of life expectancy left and a 62-year-old woman has 23.1, which puts them at 82.3 and 85.1 respectively.^[10] Both of those sit at or above every break-even we computed. Half of people will beat them.

That is the reframe. Delaying is not an investment with a payback period. It is insurance, and the thing it insures against is the expensive outcome, which is living a long time. Nobody is financially ruined by dying at 74 having claimed at 70. Plenty of people are strained at 92 having locked in 70% of their PIA thirty years earlier. Insurance is priced against the tail, not the median, and this is the cheapest inflation-adjusted longevity annuity available to an American, because the alternative is buying one from an insurer at retail.

The behavior is shifting, slowly. In the mid-1990s more than half of new male retired-worker awards started at 62. That share is now down around a quarter, and the average claiming age has climbed from roughly 63.5 to about 65.^[11] People are figuring it out. Just not fast.

None of this is advice, and your situation has variables I cannot see: health, whether you have a pension, whether you have a spouse with a much smaller earnings record, whether you actually enjoy your job. But the order of operations is defensible. If you are married and the higher earner, delay unless you have a real reason not to, because you are buying a floor for two lives. If you are single with a family history that says 75, claim early and enjoy it. And if you are still working at 62, the earnings test probably decides it for you.

Then go do the rest of the plan, because Social Security is one leg of it. Work out your safe withdrawal rate on the portfolio side with the benefit already subtracted from what you need, understand how inflation erodes the parts of your income that are not indexed, and remember that the years between 62 and 70 are the ones where compounding is still doing work for you if you can leave the account alone.

Go pull your actual PIA from your my Social Security account and run the four lines yourself. Ten minutes. It is the highest-value arithmetic in your entire retirement plan and almost nobody does it.