Social Security Benefits Tax Calculator

Up to 85% of your Social Security benefits may be taxable depending on your combined income (also called provisional income). Combined income equals your adjusted gross income plus nontaxable interest plus half of your Social Security benefits. The thresholds have not been adjusted for inflation since they were set in 1983 and 1993.

For single filers: below $25,000 combined income, benefits are not taxable; between $25,000 and $34,000, up to 50% may be taxable; above $34,000, up to 85% may be taxable. For married filing jointly: below $32,000, not taxable; between $32,000 and $44,000, up to 50%; above $44,000, up to 85%.

The thresholds were set by Congress in 1983 ($25,000/$32,000) and 1993 ($34,000/$44,000) and have never been adjusted for inflation. In 1983, only about 10% of beneficiaries paid tax on their benefits. Today, due to decades of wage growth without threshold adjustment, roughly 50% of beneficiaries owe some tax on their Social Security income.

Strategies include managing other income sources to stay below thresholds, drawing from Roth accounts (which do not count toward combined income), timing capital gains, and managing tax-exempt bond interest carefully (it counts toward combined income even though it is not taxed directly). A financial advisor can help plan the optimal withdrawal strategy.

No. Qualified Roth IRA and Roth 401(k) distributions are not included in adjusted gross income and do not count toward the combined income calculation that determines Social Security benefit taxation. This is one reason Roth conversions before claiming Social Security can be a valuable strategy.

Yes. No matter how high your other income is, the IRS will never tax more than 85% of your Social Security benefits. The remaining 15% is always tax-free. The exact percentage taxed depends on your combined income relative to the threshold levels.