When Are Social Security Benefits Taxable?

For many retirees, Social Security feels like tax-free income. It is not. Depending on your total income, up to 85% of your benefits can be subject to federal income tax. The triggering formula has not changed since 1984, and because its thresholds are not indexed for inflation, more retirees are caught every year.

How Is Provisional Income Calculated?

Provisional income is the IRS metric for determining how much of your Social Security is taxable. It is not the same as your AGI or taxable income.

What Percentage of Benefits Is Taxable?

Single filers:

• Under $25,000: 0% of benefits taxable
• $25,000 to $34,000: up to 50% of benefits taxable
• Over $34,000: up to 85% of benefits taxable

Married filing jointly:

• Under $32,000: 0% of benefits taxable
• $32,000 to $44,000: up to 50% of benefits taxable
• Over $44,000: up to 85% of benefits taxable

"Up to 85%" is the ceiling, not a flat rate. The actual taxable amount is calculated on the Social Security Benefits Worksheet in the Form 1040 instructions. The taxable portion flows to Lines 6a (total benefits) and 6b (taxable amount) of Form 1040.

Why Are More Retirees Paying Tax on Social Security?

The $25,000/$34,000 and $32,000/$44,000 thresholds were set in 1984 and 1993 respectively. They have never been adjusted for inflation. A modest pension, IRA distribution, or interest income that once kept a retiree below the threshold now routinely pushes them above it. Bracket creep is the rule, not the exception.

Which Income Sources Increase Provisional Income?

• Traditional IRA and 401(k) distributions: Included dollar-for-dollar in AGI
• Required minimum distributions (RMDs): Begin at age 73 and are fully included in AGI
• Capital gains and dividends: Taxable capital gains and qualified dividends are included in AGI
• Pension income: Fully included in AGI for most retirees
• Municipal bond interest: Counterintuitively, tax-exempt interest still counts toward provisional income even though it is not in AGI

Roth IRA distributions are excluded from AGI and do not count toward provisional income, which is why Roth conversions are a powerful pre-retirement planning tool.

How to Reduce Social Security Taxation

Roth conversions before age 73: Converting traditional IRA funds to a Roth IRA in lower-income years reduces future RMDs and removes those amounts from your AGI permanently. The conversion is taxable in the year it occurs, so timing matters.

Qualified charitable distributions (QCDs): If you are 70.5 or older, you can direct up to $108,000 per year (2026) from your IRA directly to a qualified charity. A QCD satisfies your RMD but is excluded from AGI, which directly lowers provisional income. See our guide to QCDs from IRAs for details.

Manage investment income: Holding assets in tax-deferred accounts and avoiding unnecessary taxable events in brokerage accounts keeps AGI lower.

Delay claiming Social Security: Benefits grow approximately 8% per year for each year you delay past full retirement age (up to age 70). Delaying gives more years to do Roth conversions while benefits are not yet in the picture.

OBBBA and Social Security Taxation

The OBBBA (signed July 4, 2025) did not change the Social Security benefit inclusion formula or the provisional income thresholds. It did increase the standard deduction for taxpayers 65 and older: an additional $2,000 for single filers and $1,600 per qualifying spouse for MFJ filers in 2026. This reduces taxable income but does not affect provisional income or the benefit inclusion calculation.

State Taxes on Social Security

Texas has no state income tax, so Texas residents owe no state tax on benefits. Most states that do have income taxes either exempt Social Security entirely or provide a substantial exclusion. A smaller number of states (including Minnesota and some others) tax benefits using a formula similar to the federal approach. Verify your state's current treatment, as it can change year to year.

Social Security tax planning is one of the highest-impact opportunities available to retirees. The right combination of Roth conversions, QCDs, and income timing can keep a significant portion of your benefits tax-free. Contact TS CPA for a free consultation. We respond within the same day.