Medicare Costs by Income: How IRMAA Surcharges Work

Medicare is a federal program, but it is not a flat-rate system. If your income is above a certain threshold, you will pay more for your Medicare Part B and Part D coverage. This income-based surcharge is called the Income-Related Monthly Adjustment Amount, or IRMAA. It is a reality for many retirees who have worked hard to build wealth, and understanding how it is calculated is the first step to managing your healthcare costs in retirement.

The Social Security Administration determines who pays an IRMAA based on the income reported on your tax return from two years prior. For example, your 2024 Medicare premiums are based on your 2022 tax return. They look at your Modified Adjusted Gross Income (MAGI), which includes your adjusted gross income plus any tax-exempt interest. If your MAGI exceeds the base threshold, the surcharge is added to your standard premium.

The base premium for Medicare Part B is set each year. For most people, this is the only amount they pay. However, if your income triggers an IRMAA, you will pay the standard premium plus an additional amount. The surcharges are tiered, meaning the higher your income, the higher the surcharge.

For Part D prescription drug coverage, the IRMAA is also tiered and is added to the premium of the specific Part D plan you choose. It is important to note that you pay the Part D IRMAA directly to Medicare, not to your plan provider.

Because these thresholds and surcharges change annually, it is crucial to review the current year's brackets. The standard Part B premium [as of 2024, varies by location and age] is the baseline, and the surcharges scale up from there across several income brackets for both individuals and married couples filing jointly.

The Medicare module reminds us that the real choice is Traditional Medicare (A+B) versus Medicare Advantage. Regardless of which path you choose, if you are enrolled in Part B and Part D, the IRMAA rules apply. Whether you have a Medigap policy to fill the holes in Traditional Medicare or you opt for a Medicare Advantage plan, your base Part B premium and any applicable IRMAA must be paid to keep your coverage active.

Life changes, and sometimes your income drops significantly due to retirement, the death of a spouse, or other life-changing events. If your current income is lower than what was reported on your tax return from two years ago, you do not have to simply accept the surcharge. You have the right to appeal the IRMAA decision.

You can file an appeal with the Social Security Administration using Form SSA-44. You will need to provide documentation of the life-changing event and an estimate of your new, lower income. If approved, your Medicare premiums will be adjusted to reflect your current financial reality.

Navigating Medicare costs and income surcharges can be complex, but you don't have to do it alone. We are here to walk you through every option and ensure you understand exactly what you are paying for. Protect what you've earned by making informed decisions about your healthcare coverage.