Social Security and Your IRA: How Distribution Strategy Determines How Much of Your Benefit Is Taxable

Updated June 2026. Values verified against IRC §86, IRS Rev. Proc. 2025-32, IRS Notice 2025-67, and IRS Pub. 590-B.

How provisional income works — the IRA connection

Federal law (IRC §86) taxes Social Security benefits based on provisional income — a formula most retirees never see coming:¹

Provisional Income = AGI (excluding SS) + tax-exempt interest + ½ of annual SS benefit

Thresholds (set in 1983 and 1993 — never adjusted for inflation):

What each IRA type does to provisional income:

• Traditional IRA withdrawal: 100% ordinary income → counted dollar-for-dollar in provisional income
• Roth IRA withdrawal: tax-free qualified distribution → not counted in provisional income²
• Qualified Charitable Distribution (QCD) from IRA: excluded from gross income entirely → not counted in provisional income³

This is why the structure of your IRA savings — traditional vs. Roth — is one of the highest-leverage inputs to the SS taxation formula. It's also why the years before you claim Social Security are so valuable for Roth conversions: each dollar converted at 12% now avoids potentially 85% SS taxation plus marginal tax later.

IRA + Social Security Tax Impact Calculator

Enter your expected annual income mix. The calculator shows your provisional income, how much of your SS benefit becomes taxable, and what happens if you shift some or all of your IRA draws to Roth.

The Roth IRA advantage for Social Security filers

Roth IRA distributions have two properties that make them uniquely valuable when you're receiving Social Security:

1. They're excluded from provisional income. A $30,000 Roth withdrawal leaves your provisional income unchanged. A $30,000 traditional IRA withdrawal adds $30,000 to provisional income — which can make $25,500 more of your SS benefit taxable (at the 85% marginal inclusion rate, each dollar of provisional income over the upper threshold makes 85¢ more SS income taxable).
2. Roth accounts have no RMDs (starting 2024). SECURE 2.0 §325 eliminated lifetime RMDs for Roth 401(k) accounts, and Roth IRAs never had them. So you can let Roth balances compound without forced distributions that would push you above provisional income thresholds.

The limitation: Roth IRA contributions are income-limited. For 2026, the ability to contribute directly to a Roth IRA phases out between $153,000–$168,000 for single filers and $242,000–$252,000 for married filing jointly (IRS Notice 2025-67).⁴ Above those thresholds, a backdoor Roth conversion — contributing to a non-deductible traditional IRA then converting — achieves the same result.

For most pre-retirees, the primary Roth-building tool is Roth conversion during the gap years before Social Security starts. See the Roth Conversion Window Calculator for a year-by-year model of how much you can convert at 12% while delaying SS to 70.

Qualified Charitable Distributions: the IRA-only SS tax tool

If you're age 70½ or older, a Qualified Charitable Distribution (QCD) is the most powerful tool available for reducing SS taxation from IRA-required minimum distributions. Here's why it's different from just donating after taking the RMD:

• A QCD goes directly from your IRA custodian to a qualifying charity — it never passes through your hands.
• The amount is excluded from gross income (not merely deducted), so it never appears in your provisional income formula. The same donation made as a charitable deduction would still count toward provisional income — the exclusion does not.³
• It counts toward your RMD for the year, reducing the required distribution you'd otherwise have to take as taxable income.

2026 QCD limits: $111,000 per IRA owner, $222,000 per couple (indexed for inflation; IRS Rev. Proc. 2025-67).³ A one-time QCD to a qualifying charitable remainder trust or charitable gift annuity has a separate $55,000 lifetime limit in 2026.

QCD-specific rules (easy to miss):

• Must come from an IRA — traditional, rollover, inherited, or inactive SEP/SIMPLE. Not from a 401(k) directly. (Roll a 401(k) to an IRA first.)
• Must go directly from the custodian to the charity — not withdrawn to you first. Request a check payable to the charity, or use your custodian's QCD distribution option.
• Charity must be a 501(c)(3) public charity. Donor-advised funds (DAFs) and supporting organizations do not qualify.
• No double benefit: you cannot deduct a QCD as a charitable contribution — the exclusion from income is the tax benefit.

QCD vs. regular withdrawal: how much SS tax does it save?

Example: MFJ couple, both 75, combined SS $3,600/month ($43,200/year). Required minimum distribution: $50,000/year from traditional IRA. No other income.

The $15,000 QCD saves approximately $2,830 more in federal taxes than the same $15,000 donated and deducted, because the QCD keeps the income out of provisional income — reducing how much SS is taxable in addition to reducing IRA income. This is the "double exclusion" effect.

Spousal IRA: the Roth-building tool for non-working spouses

A married person can contribute to an IRA for a non-working spouse (or low-income spouse) based on the working spouse's earned income. For 2026:

• Maximum contribution: $7,500 per spouse (under age 50); additional catch-up applies for those 50 and older — see IRS Notice 2025-67 for the exact catch-up amount⁵
• Combined IRA contributions cannot exceed the working spouse's earned income for the year
• Roth spousal IRA contributions phase out for MFJ at $242,000–$252,000 MAGI (2026)

For couples where one spouse is not working — and planning to delay Social Security to 70 — the pre-SS gap years are an ideal window to fund a Roth spousal IRA. The lower income during bridge years typically means the couple is below or near the Roth phaseout, and those contributions compound tax-free, reducing future provisional income for decades.

Example: Couple both age 62, one spouse retired, one works part-time ($60,000/year). MAGI $60,000 — well below the $242,000 Roth phaseout. Each contributes $7,500 to a Roth IRA ($15,000 combined). Over 8 years to SS age 70, that's $120,000 contributed + growth — all permanently outside the provisional income formula.

Five IRA decisions that affect SS taxation — in order of impact

1. Roth conversions in gap years before SS starts. The highest-leverage move. Converts taxable future RMDs into tax-free Roth withdrawals. See the Roth Conversion Window for the exact math.
2. QCDs at 70½+ if you're charitably inclined. Removes dollars from both RMDs and provisional income simultaneously. Every dollar of QCD is worth more than a dollar of deductible donation.
3. Roth spousal IRA contributions. Puts money in a Roth account for a non-working spouse during the bridge years at lower tax rates. Accessible without RMDs, invisible to provisional income.
4. Traditional IRA drawdown before SS starts. Live off your traditional IRA in the years before claiming, filling low brackets. Smaller traditional balance → smaller future RMDs → lower provisional income at 73/75. Covered in detail in the 401(k) + SS sequencing guide.
5. Roth 401(k) rollovers to Roth IRA. Post-SECURE 2.0, Roth 401(k) accounts have no RMDs. But rolling them to a Roth IRA at retirement eliminates any lingering RMD exposure and consolidates tracking. No tax due on the rollover — just paperwork.

When all-traditional is the right answer anyway

Despite the provisional income advantage of Roth, there are scenarios where keeping traditional IRA assets makes sense through SS claiming age:

• Very small traditional IRA balances. If your RMDs at age 73–75 will be under $10,000/year, they're unlikely to push SS into the 85% taxable zone on their own. The conversion math may not justify paying conversion taxes now.
• High current-year tax rates. If you're in the 32%+ bracket now — perhaps still working — converting traditional IRA to Roth at 32% to avoid 22% SS taxation later is negative arbitrage. The gap years at lower rates are where conversion makes sense.
• Expectation of large charitable giving in retirement. QCDs at 70½+ can offset traditional RMDs at zero cost — making Roth conversions before that age less necessary for the charitably inclined.
• Inherited traditional IRA. If you inherited a non-spouse traditional IRA, you generally cannot convert it to Roth. You face 10-year distribution rules (T.D. 10001 for post-RBD decedents) — focus on QCDs or timing distributions to low-SS-taxation years instead.

1. IRC §86 — Social Security provisional income formula and taxability thresholds. Single: $25,000 (50% zone), $34,000 (85% zone). MFJ: $32,000 / $44,000. Set 1983/1993, never inflation-indexed. At 85% tier, maximum inclusion is 85% of SS benefit.
2. IRS Publication 590-B — Qualified Roth IRA distributions (age 59½+, account open 5+ years) are excluded from gross income and therefore excluded from provisional income. No lifetime RMD requirement for Roth IRA owners.
3. IRS — Qualified Charitable Distributions. 2026 QCD limit: $111,000 per IRA owner (age 70½+), $222,000 per couple. QCDs are excluded from gross income (not merely deductible) and count toward the RMD for the year. One-time charitable gift annuity/CRT QCD: $55,000 lifetime limit (2026).
4. IRS — 2026 retirement plan limits (IRS Notice 2025-67). IRA contribution limit: $7,500. Roth IRA MAGI phaseout: $153,000–$168,000 single / $242,000–$252,000 MFJ. Backdoor Roth (non-deductible traditional IRA + conversion) available at any income level.
5. IRS — IRA contribution limits, spousal IRA rules. A spousal IRA allows a married taxpayer to contribute on behalf of a non-working or low-earning spouse, up to the annual IRA limit per spouse, provided combined contributions do not exceed the working spouse's earned income.
6. IRS — Required Minimum Distributions. SECURE 2.0 §107: RMD age 73 for born 1951–1959; RMD age 75 for born 1960+. SECURE 2.0 §325: Roth 401(k) and Roth 403(b) accounts have no lifetime RMDs starting 2024. Roth IRA has never had lifetime RMDs.

Provisional income thresholds per IRC §86. IRA contribution limits and Roth phaseouts per IRS Notice 2025-67. QCD limits per IRS guidance (2026). Standard deductions per IRS Rev. Proc. 2025-32. RMD ages per SECURE 2.0. Values verified June 2026.