1. When Is Social Security Taxable?
*Rules below apply for tax year 2026 (the return filed in 2027); the thresholds themselves are set in law and not indexed.* Social Security benefits become taxable when your provisional income exceeds certain thresholds. Provisional income equals adjusted gross income plus tax-exempt interest plus 50% of Social Security benefits. The calculation determines what portion of benefits is included in taxable income. If you are 65 or older, the separate $6,000 senior deduction may reduce taxable income — but it does not change how much of your Social Security is taxable in the first place.
2. Taxable Thresholds
For single filers, up to 50% of benefits are taxable if provisional income is between $25,000 and $34,000. Above $34,000, up to 85% may be taxable. For joint filers, the ranges are $32,000-$44,000 for 50%, and above $44,000 for 85%. These thresholds are not indexed for inflation.
3. Calculating Taxable Benefits
Use the Social Security Benefits Worksheet in the Form 1040 instructions. The calculation determines the lesser of: (1) 50% of benefits plus 85% of excess provisional income above the second threshold, or (2) 85% of total benefits. This amount is reported on Form 1040, Line 6b.
4. State Taxation
Most states do not tax Social Security benefits. However, some states do tax benefits to varying degrees. Check your state's rules if you live in a state with income tax. Some states exempt benefits entirely, while others follow federal treatment.
5. Planning Strategies
Managing taxable income can affect Social Security taxation. Strategies include Roth conversions before claiming benefits, drawing from taxable accounts first, and timing retirement account distributions. Municipal bond interest counts toward provisional income despite being federally tax-exempt. Also note: for 2025 through 2028, taxpayers age 65 or older get an additional deduction of up to $6,000 per person (phasing out above roughly $75,000 of income for singles, $150,000 for joint filers), which lowers taxable income — though it does not change the provisional-income calculation itself.