One Dollar Medicare Premium Trap
Even one extra dollar of income can push retirees into higher Medicare premium brackets, costing thousands annually due to Income-Related Monthly Adjustment Amount (IRMAA) thresholds. The "one dollar rule" means Medicare Part B and prescription plan premiums can jump sharply, making careful income planning and tax optimization essential for retirement withdrawals and Social Security timing.
- The income assessment for IRMAA is based on a two-year look-back period, meaning the Social Security Administration uses your Modified Adjusted Gross Income (MAGI) from your 2024 tax return to determine your 2026 premiums. - For IRMAA purposes, your income is calculated as Modified Adjusted Gross Income (MAGI), which starts with your Adjusted Gross Income (AGI) and adds back certain deductions, such as tax-exempt interest from municipal bonds. - For 2026, the first income tier for surcharges starts for individuals with a MAGI above $109,000 and for joint filers with a MAGI above $218,000, based on 2024 income. The Part B surcharge at this level is an additional $81.20 per month, while the Part D surcharge is an extra $14.50. - Income sources that can increase your MAGI and trigger the surcharge include the taxable portion of Social Security benefits, capital gains, and withdrawals from traditional IRAs or 401(k)s. - Withdrawals from Roth IRAs and Roth 401(k)s are not included in the MAGI calculation and therefore do not count toward IRMAA thresholds. - It is possible to appeal an IRMAA determination if your income has decreased due to certain life-changing events, such as retirement, divorce, or the death of a spouse. The appeal is filed with the Social Security Administration using Form SSA-44. - The IRMAA surcharge was first established as part of the Medicare Prescription Drug, Improvement, and Modernization Act of 2003, initially applying only to Part B premiums. The Affordable Care Act later expanded it to also include Part D prescription drug plans.
