Social Security Benefits Stop Rising at 70, Prompting Immediate Filing

Q: Why might claiming retroactive Social Security at 70 secretly permanently shrink your ongoing monthly checks?

Yes. Taking retroactive Social Security at 70 can permanently lower your future monthly benefit because Social Security treats you as if you had claimed earlier. That matters because delayed retirement credits stop at 70 but build up for each month you wait after full retirement age, adding about two-thirds of 1% per month, or 8% a year. If you ask for, say, six months of retroactive benefits at 70, the Social Security Administration effectively moves your filing date back six months. You get a lump sum for those months, but you give up the six months of delayed credits tied to them. The result is a permanently smaller monthly check for the rest of your life. A full six-month retroactive claim typically cuts the ongoing benefit by about 4% compared with simply starting at 70 with no retroactivity. That reduction can also flow through to related benefits, including survivor benefits tied to your record. Whether the lump sum is worth it depends largely on life expectancy and cash needs. Some people with serious health concerns may prefer the immediate money. But for someone likely to live many years, the higher ongoing monthly benefit often wins over time. Retroactive payments can also raise taxable income in the year received and may affect Medicare premium surcharges depending on total income. That is why advisers often say: file by 70, but be careful about electing retroactive benefits unless you have run the numbers.

3 articles · Updated · The Motley Fool · Aug 25

Age 70 is the cutoff for delayed retirement credits, so people who have not yet claimed Social Security should file immediately rather than wait longer.
Benefits rise 8% a year after full retirement age—67 for people born in 1960 or later—but that increase ends at 70, eliminating any payoff from further delay.
Up to 6 months of retroactive benefits are generally available for people who turned 70 recently, limiting losses if they missed their filing date by a few months.
Working is not a reason to keep waiting at 70: the Earnings Test no longer applies after full retirement age, though higher combined income can trigger taxes on benefits and Medicare premium surcharges.