Personal Finance & Estate › Social Security › Social Security (OASDI)
Taxation of Social Security benefits (up to 85%)
Since 1984· Tax rule
Law or rule (2026)Set by statute, regulation or the agency; numbers change yearly.
Up to 85% of Social Security benefits can be subject to federal income tax once your other income passes set thresholds.
See it on the Personal Finance & Estate map →How it works
The IRS adds half your benefits to your other income, including tax-free interest, to get 'provisional income.' Above $25,000 (single) or $32,000 (married filing jointly), up to 50% of benefits is taxable; above $34,000 or $44,000, up to 85%. These thresholds have never been adjusted for inflation, so more retirees pay each year. California does not tax Social Security. A 2025 law adds a temporary $6,000 deduction for people 65+, through 2028.
Why it matters for you
Large IRA withdrawals, Roth conversions or rental income can make more of your benefits taxable, so the timing of other income matters.
Rules, limits and sources (2026)
Enacted in the 1983 Social Security reform, taxing up to 50% from 1984; a 1993 budget law added the 85% tier. IRS Publication 915 has the worksheet.
Watch out for
Despite 'no tax on Social Security' claims, the 2025 senior deduction does not exempt benefits; whether it is extended past 2028 is open.
Connections (2)
▸Taxation of Social Security benefits (up to 85%) taxes part of Social Security (OASDI)Law or rule (2026)
How they connect
Retirees with enough other income pay federal income tax on up to 85% of their benefits. That revenue flows back: tax on the first 50% tier goes to the Social Security trust funds, and the rest to Medicare's hospital fund.
When it applies
Recommended by the 1983 Greenspan Commission to shore up finances; the 1993 budget law added the 85% tier, effective 1994.
The rule
Trustees Reports list income from taxing benefits, around 4% of Social Security's yearly income.
Watch out for
SSA's actuaries say the 2025 senior deduction slightly reduces this revenue, pulling depletion a bit earlier; ending the tax entirely would widen the gap.
▸One Big Beautiful Bill Act (2025 tax law) adds a 2025–28 senior deduction against Taxation of Social Security benefits (up to 85%)Law or rule (2026)
How they connect
The law did not end taxation of Social Security benefits, which can still be up to 85% taxable. Instead it added a $6,000 deduction per person aged 65 or older for 2025–2028, phasing out above $75,000 of income ($150,000 joint), which offsets tax on benefits and other income.
When it applies
Signed July 4, 2025; claimed on 2025–2028 federal returns whether or not the taxpayer itemizes or collects benefits.
The rule
The law's text and IRS guidance on the 'enhanced deduction for seniors', claimed on the new Schedule 1-A.
Watch out for
Whether it is extended past 2028 is open; it is often described as 'no tax on Social Security', which it technically is not.