She thought she had built a secure retirement. Social Security covered the basics, a small pension from her old employer added about $1,600 a month, and the IRS had no real claim on her benefits. Then her tax preparer flagged something on the worksheet: up to 85% of her Social Security was now taxable. Nothing had changed about her lifestyle. The pension had nudged her over a line she did not know existed.
This scenario shows up often in retirement forums. A single retiree in her late sixties asks why a modest pension created a tax bill on benefits she always heard were tax-free. The answer is almost always the same, and it has nothing to do with her spending habits.
The line that has not moved since 1984
The IRS uses a number called provisional income to decide how much of your Social Security gets taxed. It is roughly adjusted gross income (AGI), plus any tax-exempt interest, plus half of your annual Social Security benefits.
For a single filer, once that number crosses $25,000, up to 50% of benefits become taxable. Cross $34,000, and up to 85% become taxable. For married couples filing jointly, the thresholds are $32,000 and $44,000. These dollar figures have been frozen since 1984 and never indexed for inflation, which is why a pension that would have looked generous in the 1980s now lands a middle-income retiree at the top tier.
Run the math for our 68-year-old. A $1,600 monthly pension is $19,200 a year. Add half of a $24,000 annual Social Security benefit, and provisional income lands above $31,000, well past the first threshold and within sight of the second. Even a small certificate of deposit or part-time work can push her past $34,000 and into the 85% zone.
As Suze Orman put it on her July 27, 2025 podcast episode about the Big Beautiful Bill, “even if you’re just making a little bit from a pension, a CD or part-time work,” those frozen thresholds can make up to 85% of Social Security taxable.
One clarification: 85% is the share of the benefit pulled into taxable income, not the tax rate. The taxable portion is then taxed at her ordinary bracket, often 12% federal. So on a $24,000 benefit, roughly $20,400 becomes taxable, and the actual federal tax owed might land near $2,450. Real money, but not the catastrophe the 85% headline suggests.
What the 2025 tax law did and did not change
The 2025 Big Beautiful Bill added a temporary senior deduction that softens the overall tax bill for many retirees over 65. It left the $25,000 and $32,000 provisional-income thresholds untouched. Those are still the numbers Congress wrote into law in 1984. So while her total tax may shrink because of the larger deduction, the mechanics that pulled her benefits into taxable income are unchanged.
A pension arrives every month, every year, for life. The tax effect repeats every year, becoming the new baseline for as long as the pension continues.
Where the room to maneuver actually is
Pensions cannot be turned off, and Social Security, once claimed, is locked in. The useful levers sit elsewhere:
- Roth withdrawals do not count toward provisional income. Qualified Roth distributions are invisible to the formula, so spending from a Roth instead of a traditional IRA keeps the threshold math friendlier.
- Taxable-account principal is mostly invisible too. Selling shares held for years generates capital gains on the appreciation, not on the full withdrawal, so a $10,000 sale might add only a few thousand to adjusted gross income.
- Timing matters more than size. Bunching a large traditional IRA withdrawal into one year, then living off Roth or cash the next, can keep alternate years below the 85% line.
What to take from this
For a retiree already collecting both a pension and Social Security, some benefit taxation is now close to unavoidable. The honest goal is managing the bite, not eliminating it. The mistake hardest to undo is assuming benefits will stay tax-free and getting surprised by an underpayment penalty in April. The detail that matters more than people expect is the source of the spending, because the same $5,000 of spending can show up very differently on the provisional-income worksheet depending on its source.
A short conversation with a tax preparer who actually runs the worksheet can be worth more than a year of guessing.
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