Social Security Timing

How the timing math works

Social Security assigns you a “full retirement age”: 67 for anyone born in 1960 or later. File before it and your monthly benefit is permanently reduced; file after and it’s permanently increased, growing about 8% for each year you wait, until the increases stop at 70.

The spread is bigger than most people realize. For illustration: someone whose benefit at 67 would be $2,000 a month gets roughly $1,400 by starting at 62, and roughly $2,480 by waiting until 70. Same person, same work history, and the age-70 check is about 77% larger than the age-62 check. Forever, with inflation adjustments on top.

Why “break-even” thinking misleads people

The internet’s favorite approach is the break-even calculation: figure out how long you’d have to live for waiting to pay off, then treat the decision like a bet on your own lifespan. It feels rigorous. It usually asks the wrong question.

Social Security isn’t a lump sum you’re trying to maximize. It’s insurance against outliving your money. It’s the only income most retirees have that’s guaranteed for life, adjusted for inflation, and immune to market crashes. A bigger check is most valuable in precisely the scenario you should worry about: living to 95 after a couple of bad market decades. The break-even table has nothing to say about that, and nothing to say about your health, your spouse, or what you’ll live on while waiting.

The decision is bigger for couples

For married couples, timing isn’t one decision. It’s two, and they interact. When one spouse dies, the survivor keeps the larger of the two checks and loses the smaller one. That means the higher earner’s filing age sets the survivor’s income for what could be decades.

A common shape (not a rule): the higher earner waits as long as practical (their delay buys bigger protection for whoever lives longest) while the lower earner has more flexibility to start earlier for cash flow. Divorced? If the marriage lasted 10 years, you may have benefit options based on an ex-spouse’s record too. These interactions are where an afternoon decision quietly costs six figures.

What actually determines your best age

There’s no universally right answer: there’s a right answer for a specific situation, driven by a handful of knowable things: your health and family longevity, whether you’re married and the gap between your benefits, whether you’ll keep working (working before full retirement age while collecting can temporarily reduce your check), and (the piece most people miss) what the rest of the plan looks like. Waiting until 70 only works if there’s a bridge to live on in the meantime, and building that bridge from IRA withdrawals can double as a Roth-conversion window (see that guide, these decisions are teammates).

Filing is also hard to undo: you get one short do-over window in the first 12 months, and after that the decision is essentially permanent. Worth more than an afternoon.

Want a rough number to start from? Try the Social Security Timing calculator.