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How a 401(k) Balance Over $800,000 Will Quietly Cost a Retired Couple $4,600 a Year in Taxes on Social Security

The IRS formula can tax up to 85% of benefits, and one retired couple’s $45,000 withdrawal adds about $4,600 in federal taxes.

Summary
A retired couple with a healthy 401(k) and Social Security income planned for a modest tax bill, but a little-known IRS formula quietly transformed their straightforward retirement math into something far more expensive than their tax bracket suggested.

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24/7 Wall St. broke the news in Lakewood, United States on Monday, September 28, 2026.
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