Wondering how is Social Security taxed in 2026? See the exact combined-income thresholds, a step-by-step calculation, and 3 fiduciary-approved ways to keep more of your benefit.
Executive summary: Up to 85% of your Social Security benefits can be federal taxable income in 2026, but the exact amount depends on your "combined income" — not your Social Security benefit alone. The thresholds are $25,000 and $34,000 for single filers, and $32,000 and $44,000 for married couples filing jointly. These numbers haven't moved since the 1980s and 1990s, which means more retirees cross them every year as benefits rise with cost-of-living adjustments. Below, we walk through exactly how is Social Security taxed, run real 2026 numbers, and show a few planning moves that can legally lower the taxable share of your benefit.
If you're asking how is Social Security taxed, the short answer is this: your benefits are taxed based on a formula called combined income, not a flat percentage or a simple income bracket. Depending on where your combined income falls, anywhere from 0% to 85% of your Social Security benefit gets added to your taxable income and taxed at your ordinary income tax rate.
The IRS doesn't look at your Social Security benefit in isolation. Instead, it uses a number called combined income (also called provisional income) to decide how much of your benefit becomes taxable. Combined income pulls in more than just your paycheck or pension — it also includes sources of income you might assume are "invisible" to the IRS, like municipal bond interest.
Combined income is calculated as:
Combined Income = Adjusted Gross Income (AGI) + Tax-Exempt Interest + 50% of Your Social Security Benefits
Your AGI includes wages, pension income, IRA and 401(k) withdrawals, dividends, capital gains, and rental income — everything except Social Security itself. Tax-exempt interest, like income from municipal bonds, is often thought of as untaxable, but it still counts toward this combined-income test. Half of whatever you received in Social Security benefits is added on top.
For 2026, the base amounts are unchanged from prior years: $25,000 and $34,000 for single filers, heads of household, and qualifying surviving spouses; $32,000 and $44,000 for married couples filing jointly.
These thresholds have not been adjusted for inflation since the 20th century. Meanwhile, Social Security benefits rise almost every year through cost-of-living adjustments (COLA) — 2.8% in 2026. That combination means a growing share of retirees cross into taxable territory over time, even without a change in their other income.
Once you know your combined income falls above a threshold, the IRS applies a two-tier formula from Publication 915 to figure out the exact taxable dollar amount. It's not as simple as "50% of everything" or "85% of everything" — those percentages are ceilings, not flat rates.
Take a single filer with $24,000 in annual Social Security benefits and $20,000 in other income from an IRA withdrawal, with no tax-exempt interest.
Only $3,500 of this retiree's $24,000 benefit is added to taxable income — not $12,000 and not the full amount.
Now take a married couple filing jointly with $40,000 in combined Social Security benefits and $50,000 in other income.
Even in this higher-income scenario, $28,100 is taxable — not the full $34,000 ceiling (85% of $40,000). The formula phases in gradually, and the taxable amount can never exceed 85% of total benefits received.
Because combined income — not just Social Security itself — drives this calculation, retirees have more control over their tax outcome than most people realize. A few strategies our fee-only fiduciary team regularly discusses with clients:
The right combination of these strategies depends entirely on your income sources, account types, and retirement timeline — which is exactly the kind of coordinated planning a fee-only fiduciary advisor is built to help with, since there's no commission incentive tilting the recommendation one way or another.
No. Federal taxation follows the combined-income rules above in all 50 states, but state-level treatment varies widely. As of 2026, only a handful of states tax Social Security benefits to any degree, and most of those offer exemptions for lower-income residents. The large majority of states do not tax Social Security benefits at all.
No. Qualified Roth IRA distributions are not included in AGI and therefore do not count toward the combined-income test. This is one reason Roth conversions completed in lower-income years can pay off later by keeping combined income — and Social Security taxation — lower in retirement.
85% is the ceiling. No matter how high your other income is, no more than 85% of your Social Security benefit can ever be included in taxable income federally.
This article is for general educational purposes and does not constitute tax or investment advice. Every situation is different, and combined-income calculations depend on your full financial picture. Oak Road Wealth Management is a fee-only fiduciary financial planning firm — we don't earn commissions, so our only job is helping you keep more of what you've earned.
Written by Andrew Matz, Financial Planner at Oak Road Wealth Management.
