Social Security is taxed based on your combined income: your other income plus tax-exempt interest plus half of your benefit. Below $25,000 for singles or $32,000 for couples, none of it is taxed. Above those levels, up to 50% and then up to 85% becomes taxable. No one is taxed on more than 85% of their benefit.
Key takeaways:
– Whether your benefit is taxed depends on your combined income, not just your benefit amount.
– Combined income = your other income + tax-exempt interest + one-half of your Social Security benefit.
– Up to 85% of your benefit can be taxed; that 85% is a hard ceiling.
– The thresholds ($25,000/$32,000 and $34,000/$44,000) were set decades ago and are never adjusted for inflation, so more retirees cross them every year.
A lot of retirees are surprised to learn Social Security can be taxed at all. It can, and whether it is depends entirely on your other income. Here’s exactly how the math works, and why the rules quietly pull in more people every year.
What income is used to tax Social Security?
The tax on Social Security is driven by a figure called combined income, also called provisional income. It is not the same as your total income or your benefit amount. According to the Social Security Administration, combined income is your adjusted gross income, plus any tax-exempt interest, plus one-half of your Social Security benefit.
That “one-half of your benefit” piece is what trips people up. Your own benefit partly counts toward the number that decides whether your benefit is taxed. Tax-exempt municipal bond interest counts too, even though it’s otherwise tax-free. Once you have your combined income, you compare it to 2 sets of thresholds.
What are the Social Security tax thresholds?
There are 2 tiers of thresholds, and they decide how much of your benefit is taxable. The first
tier brings up to 50% of your benefit into taxation, and the second brings up to 85%.
| Filing Status | Up to 50% Taxable | Above 50% Taxable | Above 85% Taxable |
|---|---|---|---|
| Single, Head of Household | $25,000 | $34,000 | — |
| Married Filing Jointly | $32,000 | $44,000 | — |
If your combined income is below the first number for your status, none of your Social Security is taxed. Between the 2 numbers, up to half of your benefit can be taxed. Above the second number, up to 85% can be taxed. The 85% figure is the maximum, no matter how high your income goes.
Here’s the part that matters most: these thresholds have never been adjusted for inflation. The 50% tier was set in 1984 and the 85% tier in 1994, and both have stayed frozen while incomes and benefits have risen for decades. That’s why a rule that once hit only higher-income retirees now reaches a large share of ordinary ones, a trend covered in your social security isn’t safe from tax hikes.
How do you calculate the tax on your benefit?
You calculate it by finding your combined income, then applying it to the thresholds. Work it in
these steps:
1. Add up your other income. Include IRA and 401(k) withdrawals, pension income, wages, interest, dividends, and capital gains.
2. Add any tax-exempt interest. Municipal bond interest counts here even though it’s federally tax-free.
3. Add half of your Social Security benefit. Take your total annual benefit and divide by 2.
4. Compare the total to your thresholds. That total is your combined income. Measure it against the 2 tiers for your filing status.
5. Find your taxable portion. Below the first threshold, none is taxable. Between the 2, up to 50%. Above the second, up to 85%. The taxable portion is then taxed at your ordinary rate.
The result isn’t a separate Social Security tax. It’s the share of your benefit that gets added to your ordinary taxable income and taxed at your regular bracket.
Did the senior deduction make Social Security tax-free?
No. The senior deduction did not make Social Security tax-free, despite headlines that suggested it. The 2025 law created a temporary senior deduction of up to $6,000 per person age 65 and older through 2028, and that deduction can lower the tax you owe. But it works by reducing your taxable income after the benefit calculation, not by changing the thresholds that decide how much of your benefit is taxable.
In plain terms: the rules that determine your taxable Social Security are unchanged. The senior deduction can reduce what you ultimately pay, and for some lower-income retirees it can wipe out the tax entirely, but it does not repeal the tax on benefits. Understanding this distinction keeps you from over-planning around a break that’s smaller and more temporary than it sounds.
How can you reduce the tax on your Social Security?
You reduce it by managing the combined income that drives it. Because Roth withdrawals don’t count toward combined income, drawing from a Roth instead of a traditional IRA in a given year can keep more of your benefit untaxed. Doing Roth conversions before you claim, timing large withdrawals carefully, and coordinating when you turn on your benefit all move the number.
Even keeping your combined income just below a threshold in a given year can spare part of your benefit from tax, which is why this planning is worth doing annually rather than once. This is also why claiming strategy and tax strategy are connected. When and how you claim affects your combined income for years, which affects how much of the benefit you keep. See the timing side in when should you claim social security, and the full retirement tax picture in how are you taxed in retirement.
Frequently Asked Questions
Is Social Security taxed at the federal level, state level, or both?
Federally, up to 85% of your benefit can be taxed based on combined income. States vary widely, and many do not tax Social Security at all. This post covers the federal rules.
Can 100% of my Social Security be taxed?
No. The maximum taxable portion is 85% of your benefit. Even very high earners never pay federal tax on more than 85% of what they receive.
Does working while collecting Social Security increase the tax on it?
It can, because wages raise your combined income, which can push more of your benefit into the taxable range. This is separate from the earnings test that can temporarily withhold benefits before full
retirement age.
Do Roth withdrawals affect the tax on my Social Security?
No. Qualified Roth withdrawals don’t count toward combined income, so they don’t push more of your benefit into taxation. That’s a key reason a Roth balance is valuable for managing retirement income.
The tax on Social Security is one of the most misunderstood parts of retirement, and small
planning moves can meaningfully change what you keep. If you’d like to see how your combined
income affects your benefit, request a meeting and we’ll run your numbers.
About the Author
Kurt Supe, CPA, is a Retirement Planner and Chief Investment Officer for Creative Financial Group. He has spent 30 years helping retirees lower their lifetime tax bills. Connect on X and YouTube at @KurtSupeCPA, or read more on the CFG team page.