IRMAA: When Higher Income Raises Your Part B and Part D Premiums

A premium letter can hold a shock. You expected the standard Part B premium. The letter charges you more. For many new retirees, the cause is a tax return from a job they have already left. This guide explains the extra charge called IRMAA, why it looks back two years, and the route to ask for a new decision when your life has changed. This guide states no income bracket table and no added sum for any bracket. Your letter from Social Security is the source for your own sum. Our Paying for Care section holds more guides on premium costs.

What IRMAA is

Most people pay the standard Part B premium. People with higher incomes pay more. The extra part is IRMAA. It is not a tax bill and it is not a fine. It is a part of the premium for people above a set income line.

IRMAA can apply to two premiums at once. It adds to Part B. It also adds to Part D drug coverage, whether your drug coverage is a stand-alone plan or part of a Medicare Advantage plan. The two adds are set from the same income test.

Social Security runs the test. It sends a letter that tells you if an extra sum applies to you and how much it is. Keep that letter. It shows the income year used and the steps you can take if you think it is wrong.

Why the letter uses income from two years ago

Social Security does not know your income for this year yet. No tax return for it exists. So it uses the most recent return it can get from the tax office. That return is from two years ago.

For a new retiree, this can feel unfair, and it is easy to see why. A person may have sold a house, left a job, or had one strong year at work two years ago. That strong year sets the premium today, even if the pay checks have long stopped.

The two-year look is a rule of timing, not a claim about your life today. The appeal route below exists for the cases where life has in fact changed. Where life has not changed in a way the rules count, the higher premium stands for that year, and the test runs again next year from a new return.

What income counts

The income used is a form of adjusted gross income with tax-free interest added back in. Your letter and the Social Security office can confirm the exact sum used in your case. This guide does not list the bracket lines or the extra sums by bracket. Those sums are set each year, and your own letter is the safe source for your own case.

What you can do is check the facts the test rests on. Is the tax return the right one? Is the income sum on the letter the sum on that return? Was the filing status right? A plain error in the facts is a ground to ask for a fix, apart from any life change.

The life change route

If your income has fallen due to a set life change, you can ask Social Security to base your premium on a more recent year. Social Security calls this asking for a new decision. There is a form for it, and the letter you got tells you about it.

The life changes that count are set by rule. Work stoppage is one. That is the case for many retirees: they stopped work, so their income fell. Work reduction counts too. Marriage, divorce, and the death of a spouse count. Loss of a pension and loss of income from property can also count.

A one-time gain on its own is not the same as a life change on that list. A house sale or a move of savings that raised one year's income may raise your premium for a year. It does not, by itself, give the same appeal ground as a work stoppage. If you are not sure which side of that line your case sits on, ask Social Security and show your facts.

Bring proof. A letter from an employer that shows your last day of work, or papers that show a pension ended, can support your ask. The office will want to see the change and when it took place.

How this differs from the late penalty

IRMAA is not the Part B late enrollment penalty. Our guide on the Part B late enrollment penalty covers that charge. That penalty adds a share for each full year a person could have had Part B and did not.

The two can stack in a hard case. A person can owe a late penalty share and an IRMAA sum in the same month. The late penalty share is set from the standard premium. The IRMAA sum is set by income. They have distinct causes and distinct ways to fix them, so read your letter with care and tell the office which one you are asking about.

At the other end of the income scale sit the state plans that pay the Part B premium for people with low incomes. Our guide on Medicare Savings Programs covers those. IRMAA and those programs never apply to the same person at the same time. One is for high incomes. The other is for low incomes.

Who pays for what

• Original Medicare is the cover Part B gives you. You pay the premium to hold it. The base sum is the standard premium of $202.90 per month (Ledger A1), plus any IRMAA sum your letter sets.
• Medicare pays its share of covered Part B care under the usual rules. IRMAA does not change what care is covered. It changes what you pay for the cover.
• Your Part D plan gets the Part D IRMAA sum as part of your drug coverage cost. The base benchmark in that test is $38.99 per month in 2026 (Ledger A11).
• A Medigap policy pays toward the costs Original Medicare leaves. It does not remove an IRMAA sum.
• Medicaid, through a Medicare Savings Program, can pay the Part B premium for people with low incomes who qualify through their state.
• Private pay covers costs you owe with no help in place. It does not remove an IRMAA sum either.

Sample situation

Grace retired at the end of last year after a long career. This year, her premium letter charges her more than the standard Part B premium of $202.90 per month (Ledger A1). The letter shows the charge rests on her tax return from two years ago. That was her last full year of work, and her pay then was high. This year she lives on a much lower income. Grace asks Social Security for a new decision. She states a work stoppage as her life change, since she stopped work. She brings a letter from her old employer that shows her last day. Social Security looks at her more recent income and sets a new sum based on it. Grace keeps the new letter with her tax papers so she can show the basis if the charge comes up again next year. She also marks the month her next letter should come. When it does, she will check the tax year it uses before she pays the new sum. That habit will keep her from paying a charge built on facts she has not read.

What to check when a letter arrives

A high premium letter is not the end of the story. If the facts are wrong, or your life has changed in a way the rules count, ask for a new decision and show your proof. If not, plan for the higher sum this year and know that the test will run again from a new return.

• Which tax year did Social Security use? Is that sum right?
• Has your income fallen since that year? If so, was the fall tied to a life change the rules count?
• Do you have proof of the change and its date?
• Are you asking about IRMAA, or about a late penalty? The fix is not the same.
• Did you keep the letter? You will need it for any ask you make.

Sources

• https://secure.ssa.gov/apps10/poms.NSF/lnx/0601101031