She’ll Live on Social Security and the Roth She Built in Her 60s. Her Taxable Income Will Be Nothing Every Year, and Not a Dollar of Her Social Security Will Ever Be Taxed

A retiree who files her federal return every spring can get the same result each time: zero taxable income and zero tax on her Social Security. She lives on two things: her monthly benefit and withdrawals from a Roth IRA she built in her 60s. That combination relies on a quirk in how the IRS taxes Social Security benefits. If you’re wondering how to avoid tax on Social Security benefits, the answer may already be sitting in a Roth account you own.

How the IRS Decides Whether Your Benefits Get Taxed

The rule comes from Section 86 of the Internal Revenue Code. The IRS takes half of your benefits and adds them to your other income, including tax-exempt interest. Planners call that total “provisional income.” Once it passes your base amount of $25,000 for single filers or $32,000 for married couples filing jointly, part of your benefits becomes taxable. The taxable share usually tops out at 50%. It can rise to 85% once the total passes $34,000 ($44,000 if you are married filing jointly).

The first thresholds came out of the 1983 Social Security reform. Congress added the higher level in 1993. Neither one has ever been indexed for inflation. So a test written for better-off seniors now reaches ordinary ones, and every cost-of-living raise drives more retirees over the line. The 2027 COLA is tracking toward 3.5% or 3.6%, depending on the source.

Why Roth Withdrawals Never Show Up in the Formula

IRS Publication 17 says you don’t include qualified distributions from a Roth IRA in your gross income. Since that money never reaches adjusted gross income, it never reaches provisional income either. She can withdraw a large sum from her Roth, and her Social Security math stays exactly the same.

A withdrawal from a traditional IRA or 401(k) works the other way around. Every dollar you take out counts as adjusted gross income, which raises your provisional income dollar for dollar. That can pull more of your Social Security benefit into taxable income.

Your Municipal Bonds Could Be Working Against You

Municipal bond interest adds a complication. The IRS worksheet tells filers to enter any tax-exempt interest income, such as interest on municipal bonds when checking whether benefits are taxable. The interest itself stays untaxed, but it still counts toward provisional income. A retiree who bought munis to reduce her tax bill can end up paying tax on her Social Security. A neighbor drawing the same income from a Roth owes nothing on her benefit.

Why One Extra Dollar Costs More Than Your Bracket Says

Inside the phase-in range, an extra dollar of ordinary income gets taxed and also drags part of a Social Security dollar into taxable income. Take a single filer in the 12% bracket, which applies to 2026 income over $12,400. In the 50% zone, each extra IRA dollar carries an effective federal rate of 18%. In the 85% zone, that rises to 22.2%. A filer in the 22% bracket in the 85% zone pays 40.7%. As a result, a modest extra withdrawal in retirement can carry a higher effective rate than the bracket alone suggests.

How She Set It Up in Her 60s

All of this depends on every withdrawal being qualified. That takes two things. The distribution has to come after the 5-year period beginning with the first tax year for which a contribution was made to a Roth IRA, and it has to be made on or after the date you reach age 59½ (or happen because of disability or death).

1. She funded a Roth early enough that the 5-year clock ran out before she needed the money.
2. She used the years before claiming Social Security to contribute to or convert traditional balances, paying tax then. Those quiet years between a last paycheck and the first RMD are often the cheapest window to convert, which is the whole subject of our free Roth Window guide.
3. She claimed benefits and drew spending money from the Roth, so provisional income stayed under the base amount.

A Second Break on Medicare Premiums

Medicare’s income-related surcharge, called IRMAA, uses modified adjusted gross income, which SSA sets as total adjusted gross income and tax-exempt interest income. Single filers above $109,000 and joint filers above $218,000 pay more than the standard 2026 Part B premium of $202.90. SSA bases it on your Form 1040 for the two prior years and charges each enrollee separately. Qualified Roth withdrawals stay out of that number too.

Where This Strategy Falls Short

• Roth IRAs have no required minimum distributions while the owner is alive. Under a recent change, designated Roth accounts in an employer plan no longer require lifetime RMDs. Traditional accounts still require withdrawals starting at age 73 for anyone born in 1951 or later, and those withdrawals can undo the plan.
• Building the Roth meant paying tax up front. Anyone who converted at a higher rate than they’d pay on traditional withdrawals today came out behind.
• Pensions, wages, interest, and dividends all count toward provisional income. The setup only works if those stay small.
• State treatment depends on where you live. Some states may tax Social Security for certain residents, and retirement-income rules vary, so a clean federal return doesn’t guarantee a clean state return.

Here’s the number to work out for yourself: half of your expected Social Security benefit, plus all your other income, including any muni bond interest. Then compare that total to $25,000 if you file single or $32,000 if you file jointly. Every dollar of spending you shift from taxable income to qualified Roth withdrawals brings that total down.

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