Filed at 62 without doing the math
The situation. A healthy 62-year-old machinist retired the day he qualified and filed for Social Security immediately. His full retirement age benefit would have been $2,400/month. Filing at 62 locked him in at $1,680.
The mistake. He treated 'I qualify' as 'I should.' He never ran the numbers against his 401(k), his wife's benefit, or his life expectancy.
The outcome. At 78 — well within a normal lifespan — he had already left more than $86,000 on the table compared to filing at 67. And because his check is the higher of the two, his wife's survivor benefit is permanently smaller.
The date you can file is not the date you should file. Every year you delay between 62 and 70 is roughly a 7–8% raise for life, and that raise is inflation-adjusted.