How Emptying a $900,000 401(k) Before 70 Buys a Retiree a $4,700-a-Month Social Security Check for Life
Draining a seven-figure retirement account on purpose sounds reckless, but for some retirees it unlocks a Social Security benefit so much larger that the math flips everything conventional wisdom says about preserving savings.
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A hypothetical 62-year-old retires with $900,000 in a traditional 401(k). His Social Security estimate, assuming he stops working at 62, shows a full retirement age (FRA) benefit of $3,790 a month. His plan is to leave Social Security untouched until 70 and live on the 401(k) until then, even if that drains it.
The 401(k) works as a bridge. It covers eight years of spending so the Social Security benefit can keep growing, and Social Security is the only income source here that rises with inflation and lasts as long as he does.
Waiting Until 70 Adds $2,047 to Every Monthly Check
With a FRA of 67, claiming at 62 pays 70% of the full benefit. Waiting until 70 pays 124%, before any cost-of-living adjustments (COLAs). That works out to $2,653 at 62 versus about $4,700 at 70.
The gap is $2,047 a month, or $24,564 a year. Every future COLA is applied to the bigger base. The 2026 adjustment was 2.8%, so the dollar value of waiting grows a little more each year.
How $900,000 Covers Eight Years
Suppose he withdraws $132,600 at the start of each year and the account earns a steady, hypothetical 5%. Those eight withdrawals have a present value of about $899,873, so the account runs out right on schedule at 70. Because the balance is gone, required minimum distributions (RMDs) at 75 never happen.
A $20,000 Annual Tax Bill on the Withdrawals
Every dollar comes out as ordinary income. A single filer deducts the $16,100 standard deduction. That still leaves him above the line where the 24% bracket begins, at $105,700 of taxable income.
At 62, federal tax comes to roughly $20,558, about 16% of the withdrawal. That leaves around $112,042 to spend. Over eight years at 2026 tax rates, he’d pay roughly $162,000 to the IRS, factoring in the extra standard deduction at 65, plus any state tax.
Health Coverage Before Medicare and the Two-Year Lookback
From 62 to 64, he may need marketplace coverage. Starting in 2026, anyone with household income above 400% of the federal poverty line loses the premium tax credit entirely. A six-figure withdrawal puts a single filer far past that line, so he pays full price.
At 65, Medicare’s two-year lookback kicks in. Using 2026 figures, a single filer with modified adjusted gross income (MAGI) above $109,000 pays $284 a month for Part B instead of $203, plus a Part D surcharge. Together that adds about $1,148 a year. Covering part of the spending from cash in the years that count can keep his income under the line, but changes the 401(k) withdrawal schedule.
Break-Even Lands Near Age 80
If he claimed at 62, he would collect $254,688 before turning 70. At $2,047 a month extra, it takes about 10.4 years to make that up, which puts the break-even point around 80. On Social Security checks alone, every year he lives past that comes out ahead, and the bigger check also protects him if he lives into his 90s.
A steady 5% return is an assumption, and a bear market in the first three years cuts the runway. The trustees project the combined Social Security trust funds will run dry in 2034, the same year he turns 70. At that point, 83% of scheduled benefits would still be payable.
After 70, his income is mostly Social Security. For single filers, benefits start becoming taxable above $25,000 of combined income. Above $34,000, as much as 85% can be taxed. With no 401(k) or RMDs adding income, he avoids most of the tax cascade that hits retired people with large accounts. His spending drops from about $112,000 to $56,400 a year in Social Security unless other assets fill the gap.
Three Checks Before You Drain the Account
- Pull your Social Security statement and multiply your full retirement age benefit by 1.24. If the age-70 figure doesn’t cover your basic expenses on its own, a full drawdown leaves you with no backup.
- Map your income from 63 through 69 against the income-related monthly adjustment amount (IRMAA) threshold ($109,000 single; $218,000 joint in 2026). Fund anything above it from cash or taxable accounts.
- Write out a budget for age 70 and beyond. The strategy works only if a Roth IRA, taxable account, pension or home equity can cover what Social Security doesn’t. If not, keep part of the 401(k) invested and lower the annual withdrawal.
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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.
