Here’s a question I’ve been asked a hundred different ways over the years: “I’m in the 12% bracket. So why did pulling $10,000 out of my IRA cost me more than $2,000 in tax?”

The answer is a feature of the tax code that financial planners call the Social Security tax torpedo. It’s been sitting there since 1984. It hits more retirees every single year. And almost nobody sees it coming until they open their tax return.

I’ve been a CPA since 1981, so I watched this thing get built. Let me show you exactly how it works, with real 2026 numbers, and then how to steer around it.

How Social Security gets taxed

Most people assume Social Security is either taxed or it isn’t. It’s neither. The IRS runs a formula.

Take your other income — IRA withdrawals, pension, interest, wages — add any tax-free municipal bond interest, then add half your Social Security benefits. The IRS calls that your combined income.

If that number is under $25,000 for a single filer or $32,000 for a couple, none of your benefits are taxed. Above that, up to 50% of your benefits become taxable. Cross $34,000 as a single filer or $44,000 as a married filer, and up to 85% of your benefits are taxable.

Here’s the part that should make you angry. Congress set those thresholds in 1983 and 1993 and deliberately didn’t index them to inflation. In 1984, fewer than 10% of beneficiaries owed any tax on their benefits, according to the Social Security Administration’s own research.

Today, the Congressional Budget Office says slightly more than half of beneficiaries pay tax on their benefits. Not because they got richer. Because a dollar today buys roughly a third of what it did in 1984, and the line never moved.

Where the torpedo hits

The damage happens in the zone where each new dollar of income also drags Social Security into the taxable pile.

Once you’re past the $34,000 combined-income line, every additional dollar you withdraw from an IRA makes 85 cents of your Social Security taxable too. So the IRS taxes $1.85 for every $1 you took out.

In the 12% bracket, that works out to a real marginal rate of 22.2%. In the 22% bracket, it’s a punishing 40.7%.

That’s the torpedo. Your bracket says 12%. Your bill says otherwise.

The $10,000 withdrawal, step by step

Let’s make it concrete. Meet a single retiree, 67 years old, collecting $2,000 a month in Social Security — $24,000 a year, right around the 2026 average retired-worker benefit. She’s also taking $30,000 a year from her traditional IRA.

Her combined income is $30,000 plus half of $24,000, or $42,000. That’s over the $34,000 line; so running her numbers through the IRS worksheet, $11,300 of her Social Security is taxable. Her adjusted gross income is $41,300.

For 2026 she gets a $16,100 standard deduction, plus $2,050 for being over 65, plus the new $6,000 senior deduction. That’s $24,150 off the top. Taxable income: $17,150. Federal tax: $1,810.

Now her roof needs work, and she pulls an extra $10,000 from the IRA.

Her combined income jumps to $52,000. Taxable Social Security jumps to $19,800 — an extra $8,500 of benefits pulled into the taxable column. Her adjusted gross income is now $59,800, and her taxable income is $35,650. Federal tax: $4,030.

The $10,000 withdrawal cost her $2,220 in federal tax. That’s 22.2%, nearly double the 12% bracket she thought she was in. She never left the 12% bracket. The torpedo did the rest.

A married couple, both 67, with $40,000 in Social Security and $40,000 in IRA withdrawals gets hit the same way. Add $10,000 and their tax goes from $1,210 to $3,176 — almost 20 cents on every extra dollar, from a couple who started the year in the 10% bracket.

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Didn’t they just end taxes on Social Security?

No. What passed in 2025 was a temporary $6,000 deduction for people 65 and older, available through 2028 and phased out for higher incomes. It’s real money, and it’s in the example above. But it doesn’t touch the torpedo.

Here’s why. The senior deduction reduces your taxable income at the end of the calculation. The $25,000 and $34,000 thresholds are applied at the beginning, to your combined income.

The deduction can shrink your bill, but it can’t stop your benefits from being dragged into taxable income in the first place. Same formula, same 1984 thresholds.

Bills to repeal the tax outright or index the thresholds have been introduced for years. None has gone anywhere, and with the CBO counting roughly $120 billion a year in revenue from this tax, don’t hold your breath.

How to steer around it

You can’t change the formula. You can change what feeds into it. We’ve covered ways to avoid paying taxes on Social Security; here’s how they apply to the torpedo specifically.

Get money into a Roth before you claim. Qualified Roth IRA withdrawals aren’t included in adjusted gross income, which means they never touch your combined income.

If you have a few low-income years between retiring and claiming Social Security, converting traditional IRA money to a Roth then — and paying tax at your real bracket — can defuse the torpedo for the rest of your life.

Drain the IRA first, and delay the benefit. Every year you wait to claim past full retirement age adds 8% to your benefit until 70.

If you live on IRA withdrawals in those years, those withdrawals aren’t competing with Social Security for room under the thresholds. Then the bigger check arrives when your IRA is smaller.

Give from the IRA, not your checking account. If you’re 70½ or older, a qualified charitable distribution sends money straight from your IRA to a charity. It counts toward your required minimum distribution, but it never lands in your income. The 2026 limit is $111,000.

Watch the timing of big withdrawals. Our retiree with the roof could split that $10,000 across December and January. Two smaller withdrawals in two tax years might keep both under the worst part of the curve. Run the numbers before you hit the button, not after.

Check your state. Eight states still tax Social Security benefits in 2026, though most exempt lower and middle incomes.

The bottom line

The tax torpedo isn’t a loophole and it isn’t a mistake. It’s a threshold Congress set when a $25,000 income made you comfortable, then let inflation do the dirty work for four decades.

You can’t fix Washington. But you can control which account you pull from, when you pull, and where the money goes. Get those three things right and a $10,000 withdrawal costs you what your bracket says it should — not nearly double.