Understanding IRMAA
and Medicare Income Surcharges
A simple guide to understanding Medicare enrollment at age 65 and avoiding costly timing mistakes.
Some people are surprised to learn that Medicare premiums are not the same for everyone.
If your income is above certain levels, Medicare may charge an additional fee called an Income-Related Monthly Adjustment Amount (IRMAA).
This extra cost can increase the price of Medicare Part B and Medicare Part D.
Many retirees first discover IRMAA when they notice their Part B premium is higher than expected.
The good news is that once you understand how Medicare calculates IRMAA, it becomes much easier to anticipate these costs and plan ahead.
If you are still learning how Medicare works overall, you may also want to review our guide to Medicare enrollment at age 65.
Why is My Medicare Part B Premium Higher?
One of the most common questions people ask is: "Why is my Medicare premium higher than other people’s?"
The reason is often income.
Medicare charges higher premiums for households whose income exceeds certain limits.
This additional charge is called IRMAA, which stands for Income-Related Monthly Adjustment Amount.
If your income falls above certain limits, Medicare adds a monthly surcharge to your Part B and Part D premiums.
What IRMAA Means
IRMAA stands for Income-Related Monthly Adjustment Amount.
It is an additional cost added to your Medicare Part B and Part D premiums when your income exceeds specific levels set by Medicare.
These adjustments are part of the way Medicare helps fund the program.
In simple terms: Higher income households may pay higher Medicare premiums.
Not everyone pays IRMAA, but it affects a growing number of retirees each year.
How Medicare Determines IRMAA
Medicare does not look at your current income.
Instead, the Social Security Administration uses your federal tax return from two years earlier to determine your IRMAA bracket.
For example: If you are paying Medicare premiums in 2026, Medicare typically reviews your 2024 tax return.
They use a number called Modified Adjusted Gross Income (MAGI).
MAGI Includes:
Taxable Income
certain investment income
tax-exempt interest income
Understanding your Medicare enrollment timeline is also important, since delaying certain parts of Medicare can lead to additional penalties.
If your income exceeds certain limits, Medicare adds an IRMAA surcharge to your monthly premiums.
Medicare IRMAA Income Brackets
Medicare uses income brackets to determine when IRMAA applies.
As income increases, the Medicare premium surcharge also increases.
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Example of Medicare IRMAA income brackets and how income can affect Medicare premiums.
This chart shows how higher income levels can result in higher Part B and Part D premiums.
Income thresholds are adjusted periodically, so it is helpful to review them each year. These Medicare IRMAA brackets determine how income can affect your monthly Medicare premiums.
Common Situations That Can Trigger IRMAA
Many retirees experience IRMAA after a one-time increase in income.
Some common situations include:
selling a home or investment property
large capital gains from investments
required minimum distributions (RMDs)
Roth conversions
selling a business
higher income during the early years of retirement
Sometimes a single financial event can temporarily increase income enough to trigger Medicare income surcharges
Planning Around IRMAA
Understanding IRMAA can help retirees anticipate future Medicare costs.
Some people work with financial professionals to coordinate certain financial decisions that may affect income.
For Example:
timing withdrawals from retirement accounts
managing capital gains
planning asset sales
coordinating Required Minimum Distributions
Everyone’s situation is different, but being aware of IRMAA can help reduce surprises in Medicare premiums.
FAQs
What is Medicare IRMAA?
IRMAA stands for Income-Related Monthly Adjustment Amount. It is an extra charge added to Medicare Part B and Part D premiums when your income exceeds certain limits.
What income triggers IRMAA?
IRMAA is triggered when your Modified Adjusted Gross Income, or MAGI, exceeds the income thresholds set by Medicare. Income from investments, retirement withdrawals, capital gains, and other sources may count toward these limits.
Does IRMAA apply to Medicare Part A?
No. IRMAA only affects Medicare Part B and Medicare Part D premiums. Most people do not pay a premium for Part A if they have enough work history.
How long does IRMAA last?
IRMAA is recalculated each year based on your tax return from two years earlier. If your income decreases, your Medicare premium may also decrease in future years.
Can you appeal an IRMAA surcharge?
Yes. If your income dropped because of certain life-changing events, such as retirement, marriage, divorce, or the death of a spouse, you may be able to request an IRMAA reconsideration through Social Security.
Need Help Understanding Your Medicare Costs?
Many people discover IRMAA only after receiving a higher Medicare premium notice.
Medicare rules can feel confusing, especially when income begins affecting your premiums.
If it would be helpful, we can review your Medicare coverage and help explain how income may affect your Medicare premiums.
At Gold Horizon Insurance Solutions, our goal is to make Medicare simple and easy to understand.
There is no pressure and no obligation.
Just clear guidance so you can make confident decisions about your healthcare coverage.
Maverick Gold
Independent Medicare Advisor
© 2026 Gold Horizon Insurance Solutions. All rights reserved
We are not connected with or endorsed by the United States government or the federal Medicare program. We do not offer every plan available in your area. Any information we provide is limited to those plans we do offer in your area. Please contact Medicare.gov or 1-800-MEDICARE to get information on all of your options.
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