Required minimum distributions do not affect your Social Security benefit amount itself, but they can shrink what you actually keep from it. The benefit calculation is fixed by your lifetime earnings record and does not change based on how much you withdraw from a traditional IRA or 401(k). What RMDs do is push up the income figure the IRS uses to decide how much of your benefit is taxable, and the income figure Medicare uses to set the premiums that come out of your monthly check. So the question of whether RMDs affect Social Security has a two-part answer: the gross benefit stays the same, the net can drop noticeably.
Your Benefit Amount Doesn’t Change
Social Security benefits are calculated from your lifetime earnings history. Investment income, retirement account withdrawals, and RMDs play no role in that calculation. Nothing you take out of a traditional IRA will reduce the gross benefit the Social Security Administration pays you. The effects all show up on the tax side and on the Medicare side.
How RMDs Make More of Your Social Security Taxable
Traditional IRAs, 401(k)s, and similar accounts are tax-deferred: you skipped tax on the way in, so the IRS treats withdrawals as ordinary income on the way out. Federal law requires most account holders to start taking these withdrawals at age 73, and the starting age rises to 75 for people who turn 74 after 2032.1Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs
Social Security benefits are not automatically taxed. They only become taxable once your total income crosses set thresholds, and the IRS measures that with a formula called combined income. Take your adjusted gross income, add any tax-exempt interest, then add half of your Social Security benefits for the year.2Internal Revenue Service. Publication 915 (2025), Social Security and Equivalent Railroad Retirement Benefits RMDs feed straight into the adjusted gross income piece. A $30,000 distribution adds $30,000 before Social Security even enters the math.
The thresholds are set by federal statute and have never been adjusted for inflation:3Office of the Law Revision Counsel. 26 USC 86 – Social Security and Tier 1 Railroad Retirement Benefits
- Single filers with combined income between $25,000 and $34,000: up to 50% of benefits become taxable.
- Single filers above $34,000: up to 85% of benefits become taxable.
- Joint filers between $32,000 and $44,000: up to 50%.
- Joint filers above $44,000: up to 85%.4Internal Revenue Service. IRS Reminds Taxpayers Their Social Security Benefits May Be Taxable
An example shows how quickly an RMD moves the needle. A single retiree collecting $18,000 in Social Security and $5,000 in pension income has combined income of $14,000 (half the Social Security plus the pension), safely below the $25,000 floor. Add a $15,000 RMD and combined income jumps to $29,000, landing in the range where up to half the benefit is taxable. A larger withdrawal pushes past $34,000 and up to 85% is included on the return.
The 85% figure is a cap on how much of the benefit gets included as taxable income. That portion is then taxed at your ordinary income rate. You will never owe tax on more than 85% of your Social Security, no matter how high your income climbs.
How RMDs Raise the Medicare Premiums Taken From Your Check
The second effect is quieter and often overlooked. Medicare Part B and Part D premiums are deducted directly from most retirees’ Social Security payments, and higher-income beneficiaries pay a surcharge called the Income-Related Monthly Adjustment Amount, or IRMAA. The Social Security Administration sets it using your modified adjusted gross income from two years earlier.5Social Security Administration. Premiums: Rules for Higher-Income Beneficiaries A big RMD in 2024 lands on your 2026 Medicare premium.
The standard Part B premium for 2026 is $202.90 per month.6Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles For single filers in 2026:
- MAGI at or below $109,000: no surcharge, $202.90 total.
- MAGI $109,001 to $137,000: $81.20 surcharge, $284.10 total.
- MAGI $137,001 to $171,000: $202.90 surcharge, $405.80 total.
- MAGI $171,001 to $205,000: $324.60 surcharge, $527.50 total.
- MAGI $205,001 to $499,999: $446.30 surcharge, $649.20 total.
- MAGI $500,000 or more: $487.00 surcharge, $689.90 total.6Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles
Joint filers face the same surcharge amounts at roughly double the income thresholds, starting at $218,000. Part D prescription drug plans carry their own IRMAA surcharge on the same brackets, adding between $14.50 and $91.00 per month on top of the drug plan premium.7Medicare.gov. 2026 Medicare Costs Every dollar of the surcharge comes out of your Social Security deposit.
The two-year lookback traps people who take an unusually large withdrawal for a one-time purpose. By the time the surcharge appears, the distribution is well behind you.
When You Can Appeal an IRMAA Surcharge
If your income has dropped since the tax year the SSA is using because of a qualifying life event, such as retirement, the death of a spouse, divorce, or loss of income-producing property, you can request a reduction. File Form SSA-44 online through your Social Security account or by fax or mail to your local office.8Social Security Administration. Request to Lower an Income-Related Monthly Adjustment Amount The appeal is designed for real changes in circumstances, not for disputing the surcharge when your income is still high.
The First-Year Double-RMD Trap
A timing rule in your first RMD year can multiply the tax and Medicare hit. Your first RMD is due for the year you turn 73, but the IRS lets you delay that initial withdrawal until April 1 of the following year.1Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs The second RMD is still due December 31 of that same year. If you delay, two taxable distributions land in one calendar year.
Two RMDs in a single year can double the income flowing into the combined income formula and the MAGI Medicare uses two years later. A retiree who would have stayed under the Social Security taxation thresholds with one distribution may sail past them with two. The delay is rarely worth it unless age 73 was an unusually high-income year and age 74 will be much lower. For most people, taking the first RMD on time in the year you turn 73 is the better move.
Ways to Soften the Impact
You cannot skip RMDs from traditional accounts, but you can manage what they do to Social Security and Medicare. These options work best when started well before age 73.
Roth Conversions Before RMDs Begin
Roth IRAs and designated Roth accounts in 401(k) and 403(b) plans are not subject to RMDs during the owner’s lifetime.1Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs Converting traditional balances to Roth during the gap years between leaving work and turning 73 shrinks the balance that will eventually produce mandatory withdrawals. You pay income tax on the converted amount in the year of conversion, so the strategy pays off when your income is temporarily low. Every dollar moved to a Roth is a dollar that will never appear in the combined income formula or in the MAGI Medicare watches.
Qualified Charitable Distributions
If you are 70½ or older and give to charity, a Qualified Charitable Distribution sends money straight from your IRA to a qualified charity. It counts toward your RMD but is excluded from taxable income. For 2026 the annual QCD limit is $111,000, with up to $55,000 available for a one-time donation to a charitable remainder trust or charitable gift annuity.9Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs, as Adjusted for Changes in Cost-of-Living Because a QCD never touches adjusted gross income, it drops out of both the Social Security taxation formula and the IRMAA calculation. It is one of the cleanest tools available for retirees who were planning to give anyway.
Qualified Longevity Annuity Contracts
A Qualified Longevity Annuity Contract lets you use up to $210,000 from retirement accounts to buy an annuity that begins paying as late as age 85.9Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs, as Adjusted for Changes in Cost-of-Living The amount inside the QLAC is excluded from the balance used to compute your annual RMD, which lowers required withdrawals through your 70s and early 80s and the income that flows into both formulas. The trade is that you lock up funds you cannot reach until the annuity payments start.
A Note on State Taxes
Federal rules are not the whole picture. Eight states still tax Social Security benefits to some degree: Colorado, Connecticut, Minnesota, Montana, New Mexico, Rhode Island, Utah, and Vermont. Each sets its own thresholds and exemptions. If you live in one of them, an RMD can push you past a state-level exemption the same way it pushes you past the federal thresholds. The other states and the District of Columbia either have no income tax or fully exempt the benefit.