AI Stocks Lose $1 Trillion in a Day. At 68, She Will Take $15,000 in Back Social Security Payments and Give Up a Bigger Monthly Check
When a trillion dollars evaporates from tech stocks in a single day, a retiree sitting on unclaimed Social Security faces a choice that sounds simple but carries consequences that stretch decades into the future.
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In a punishing end to October, an AI-driven technology selloff wiped out roughly $1 trillion in stock value in a single day. Picture a 68-year-old who has been living off her brokerage account so her Social Security could keep growing. A drop like that leads to a fair question: why sell shares at a low point when the government owes her money?
She’s past full retirement age (FRA) but has yet to claim. If she applies now, Social Security lets her request up to six months of retroactive benefits. Suppose those payments would be $2,500 a month, compared with roughly $2,600 if she starts collecting now. Taking the back pay gives her $15,000 in one lump sum, before any deductions.
The tradeoff comes down to one question: Is $15,000 in cash today worth giving up a bigger Social Security check for the rest of her life?
What That $15,000 Really Costs Her Every Month
For every month she waited past FRA, she earned a delayed retirement credit of two-thirds of 1%, or 8% a year. Taking six months of back pay moves her official start date six months earlier, costing her six months of those credits. That’s four percentage points of her full retirement benefit, leaving her with a smaller monthly check for life.
In this example, the difference is roughly $100 a month, and it lasts for the rest of her life.
At that rate, it takes about 12.5 years for the larger monthly checks to make up the $15,000 she passed up. That puts her break-even point in her early 80s. If she lives beyond that, skipping the lump sum could pay off.
The gap also grows over time. Cost-of-living adjustments are a percentage of your check, so a larger benefit gets a larger raise. The 3.6% adjustment set for 2027 will apply to whichever check she locks in, which makes that $100 difference a little bigger every year.
How the Back Pay Fits With a Shaken Portfolio
The best argument for taking the lump sum is timing. Selling stocks after a sharp drop locks in their lower market value, whether or not the shares have fallen below what she originally paid. If $15,000 covers several months of expenses she would otherwise fund by selling investments, her portfolio has more time to recover. For some retirees, that breathing room is worth a smaller monthly check.
Taxes can shrink the benefit, though. If she applies in November and receives the $15,000 before year-end, the lump sum counts toward her 2026 Social Security benefits for tax purposes. Depending on her other income, part of it may be taxable.
For single filers, up to half of benefits become taxable once “provisional income” passes $25,000, and up to 85% becomes taxable above $34,000. Provisional income is about your other income plus half of your Social Security. Those thresholds don’t rise with inflation. If she also sold stock or took withdrawals from her individual retirement account this year, the back pay is added on top.
Her net deposit may also be less because of Medicare. The standard Part B premium is $202.90 a month in 2026 and generally comes out of Social Security once benefits start. If she’s married and the higher earner, taking the lump sum could also mean a smaller survivor benefit for her spouse.
Two Questions That Settle Most of the Decision
- Does she have another way to cover the next six months? If cash or a maturing CD can pay her bills without selling beaten-down stocks, keeping the bigger monthly check may be worth more over a long retirement. The back pay becomes more appealing if the alternative is selling shares after a steep decline.
- How long does she expect to live? Her own health and how long her parents lived tell her more than any market headline. The selloff may pass in months. The smaller check stays with her, and possibly her spouse, for decades. Since this choice is very hard to reverse once payments start, it’s worth treating as permanent.
The right answer depends on details like whether she’s married, what else she’s earning this year and how much cash she has on hand. Before she checks the retroactive box, she can ask Social Security for both numbers side by side: her monthly benefit with the back pay and without it.
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Gerelyn Terzo is the author of dividend investing handbook "Dividend Investing Strategies: How to Have Your Cake & Eat It Too." A veteran financial journalist, she covers agri-finance for outlets like Global AgInvesting and the broader stock market and personal finance for 24/7 Wall Street. She began at CNBC and later helped launch Fox Business in New York. Gerelyn currently resides in Woodland Park, Colorado and dabbles in nature photography as a hobby.
