Many retirees make a dangerous assumption about their tax bills. They think that because they've left the workforce, they'll pay less in taxes. That's often wrong.
The problem comes from overlooking how multiple income sources interact in retirement. When you withdraw from a traditional 401(k) or IRA, that money counts as ordinary income. Social Security benefits can be partially taxable depending on your combined income. Investment accounts generate capital gains and dividends. Rental properties produce taxable income. These sources stack on top of each other.
Here's what catches people off guard: the tax brackets don't disappear in retirement. If you're married filing jointly, you still face graduated rates. But your income from Social Security, 401(k) withdrawals, and investment earnings can push you into higher brackets faster than you expect. A couple pulling $50,000 from a 401(k), receiving $40,000 in Social Security, and earning $20,000 in investment income faces taxation on all three sources simultaneously.
The IRS uses a formula called "combined income" to determine how much of your Social Security becomes taxable. This calculation includes half your Social Security benefits plus all other income. If your combined income exceeds $25,000 (single) or $32,000 (married filing jointly), you'll owe federal tax on 50 to 85 percent of your benefits.
State taxes complicate matters further. Some states tax 401(k) withdrawals while others don't. A retiree moving from a low-tax state to a high-tax state faces unexpected liability.
The solution requires planning ahead. Work with a tax professional to map out your retirement income streams before you retire. Consider strategies like Roth conversions while in lower-income years, timing your 401(k) withdrawals, and positioning taxable accounts strategically.
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