Medicare IRMAA in 2026: How Retirement Income Can Raise Your Premiums

A large Roth conversion, property sale, or year of unusually high investment gains can affect more than income taxes. For Medicare beneficiaries, higher income may trigger the income-related monthly adjustment amount, known as IRMAA. This surcharge can raise Part B and Part D costs for an entire year, making it an important part of retirement tax planning.

What IRMAA changes in 2026

The standard Medicare Part B premium is $202.90 per month in 2026. Beneficiaries above the income thresholds pay the standard premium plus an IRMAA surcharge. Part D plans have their own premiums, and higher-income beneficiaries pay a separate Part D adjustment in addition to the plan premium.

IRMAA works in tiers: crossing into the next band can raise premiums even if income exceeds the threshold by a small amount. That does not mean avoiding every profitable or tax-efficient move. It means the surcharge belongs in the cost-benefit calculation.

The two-year lookback

For 2026 premiums, Social Security generally relies on modified adjusted gross income from the 2024 federal tax return. For IRMAA, modified adjusted gross income is generally adjusted gross income plus tax-exempt interest. This lag surprises new retirees whose current income is far lower than it was while working.

Social Security sends a notice explaining the determination. Review the filing status, income year, and premium tier. A stale or amended return or a major income change may create grounds to request a new determination.

Income events that can push a retiree higher

• Large traditional IRA or 401(k) withdrawals.
• Roth conversions, which generally add untaxed converted dollars to income.
• Capital gains from investments, real estate, or a business sale.
• Required minimum distributions and taxable pension income.
• Tax-exempt municipal-bond interest, which is added back for IRMAA.

Qualified Roth withdrawals generally do not increase adjusted gross income, which can make Roth assets valuable for managing future Medicare costs. Bank cash can also fund spending without creating new taxable income, although interest remains taxable.

When an appeal may be appropriate

Rules recognize several life-changing events, including marriage, divorce, death of a spouse, work stoppage, work reduction, loss of income-producing property, loss of pension income, and certain employer settlement payments. If one caused a meaningful income decline, you may ask Social Security to use a more recent year or current estimate.

Retirement commonly supports an appeal under work stoppage or reduction. Keep the IRMAA notice, proof of the event, and a reasonable income estimate. A routine market loss or voluntary asset sale is not automatically treated the same as a qualifying event.

Planning without letting the tail wag the dog

Project modified adjusted gross income before year-end and leave a buffer for mutual-fund distributions, year-end interest, or an unexpected gain. If considering a Roth conversion, compare long-term tax savings with the one-year or multi-year Medicare cost.

Spreading a conversion across years may reduce bracket pressure, but sometimes paying one year of higher IRMAA is worthwhile to shrink future RMDs. Likewise, refusing to realize a gain solely to avoid a surcharge can allow investment risk to grow. Optimize total lifetime cost, not one premium line.

A practical annual checklist

• Estimate adjusted gross income and tax-exempt interest by early fall.
• Track conversions, gains, dividends, pensions, and planned withdrawals.
• Check proximity to the next IRMAA threshold.
• Save documents for any qualifying life-changing event.
• Review the notice promptly and appeal within its stated window.

The bottom line: IRMAA is not a reason to fear retirement income. It is a reason to coordinate taxes, withdrawals, investment sales, and Medicare premiums before an income spike becomes permanent tax-return history.