Key Takeaways

IRMAA is an extra: IRMAA is an extra charge added to your Medicare Part B and Part D premiums based on your income.
Your modified adjusted gross: Your modified adjusted gross income (MAGI) from two years prior determines if you pay IRMAA.
There are specific income: There are specific income thresholds that trigger IRMAA, which are adjusted annually.
You can appeal an: You can appeal an IRMAA decision if your income has decreased due to certain life-changing events.
Understanding IRMAA is crucial: Understanding IRMAA is crucial for managing your overall Medicare costs effectively.

What is IRMAA?

The Income-Related Monthly Adjustment Amount, or IRMAA, is an additional premium that some Medicare beneficiaries pay for their Part B and Part D coverage. This extra cost is determined by your modified adjusted gross income (MAGI) from two years prior. It ensures that those with higher incomes contribute more to their Medicare costs, helping to sustain the program for everyone. Understanding IRMAA is essential for accurately forecasting your total Medicare costs.

Medicare uses your tax return from two years ago to calculate your IRMAA. For example, your 2026 IRMAA will be based on your 2024 tax return. This look-back period can sometimes lead to confusion, especially if your income has changed significantly. It's important to keep track of your income levels to anticipate any potential IRMAA charges.

IRMAA affects both your Medicare Part B and Part D premiums. This means that if you are subject to IRMAA, you will pay a higher premium for both your medical insurance and your prescription drug coverage. These adjustments are applied on a sliding scale, with higher incomes leading to larger additional amounts.

How is IRMAA Determined?

The Social Security Administration (SSA) is responsible for determining who pays IRMAA. They obtain your tax information directly from the IRS. If your MAGI exceeds certain thresholds, the SSA will notify you of your IRMAA determination. These thresholds are adjusted annually, so it's important to stay informed about the current year's limits.

Your MAGI includes your adjusted gross income plus any tax-exempt interest income. This comprehensive calculation ensures that all relevant income sources are considered when assessing your IRMAA liability. It's not just your taxable income that matters, but also other forms of income that might not be taxed.

If you disagree with the SSA's IRMAA determination, or if your income has significantly decreased due to a life-changing event, you have the right to appeal. Life-changing events can include marriage, divorce, death of a spouse, work stoppage, or loss of income-producing property. Providing documentation for these events can help reduce or eliminate your IRMAA.

2026 IRMAA Income Thresholds and Surcharges

The income thresholds for IRMAA are tiered and updated each year by the Social Security Administration. For 2026, IRMAA kicks in when your 2024 MAGI exceeds $109,000 (single filers) or $218,000 (married filing jointly). Here are the exact 2026 brackets from CMS:

Single MAGI	Joint MAGI	Part B Premium	Part D Surcharge
Up to $109,000	Up to $218,000	$202.90	$0
$109,001 - $137,000	$218,001 - $274,000	$284.10	$14.50
$137,001 - $171,000	$274,001 - $342,000	$405.80	$37.60
$171,001 - $205,000	$342,001 - $410,000	$527.50	$60.80
$205,001 - $499,999	$410,001 - $749,999	$649.20	$84.10
$500,000 or more	$750,000 or more	$689.90	$84.10

Note: Part D surcharges shown above are added to your plan's own premium. The standard Part B premium for most beneficiaries is $202.90 per month in 2026. If your income is close to a threshold, strategic financial planning in 2024 (the look-back year) can help you avoid moving into a higher bracket. Consulting with a financial advisor or Medicare advisor can be beneficial in these situations.

Appealing an IRMAA Decision

If you believe your IRMAA determination is incorrect, or if your financial situation has changed, you can file an appeal with the Social Security Administration. The SSA provides specific forms and procedures for this process. It's important to act promptly once you receive an IRMAA notice, as there are deadlines for filing appeals.

To appeal, you will typically need to provide documentation supporting your claim. This could include tax returns, pay stubs, or official documents related to life-changing events. The more evidence you can provide, the stronger your appeal will be. The SSA will review your case and make a new determination.

Successfully appealing an IRMAA decision can lead to a reduction or elimination of the additional premium, saving you money on your monthly Medicare costs. Many beneficiaries find this process worthwhile, especially if their income has genuinely decreased. For more information on managing your Medicare supplement options, consider exploring available resources.

Bottom Line

IRMAA is an important consideration for many Medicare beneficiaries, particularly those with higher incomes. It represents an additional cost for both Part B and Part D premiums, determined by your income from two years prior. Understanding how IRMAA is calculated, the income thresholds, and your right to appeal can help you manage your Medicare expenses more effectively. Proactive planning and staying informed are key to navigating these adjustments and ensuring you are prepared for your healthcare costs.