How to Know If an IRMAA Increase Is Coming in 2027: What to Look for in the Mail
How to Know If an IRMAA Increase Is Coming in 2027: What to Look for in the Mail
Some Medicare households pay more for Part B and Part D because of income reported two years earlier. This guide explains what the Social Security letter says, which income counts, what the 2026 brackets are, what 2027 may look like, and why this year’s income is already setting up 2028.
Most Medicare households know the standard Part B premium. Fewer know that it is a starting point. Medicare Part B and Part D both carry an income-based surcharge for higher earners, and the surcharge is decided using a tax return filed long before the premium bill arrives. The result is a letter that surprises people who were not expecting it, usually in the fall, and usually from Social Security.
This guide is educational. It explains how the surcharge works, what the official 2026 numbers are, and what a projection for 2027 looks like. It does not recommend any action, and it is not tax advice. A household’s tax professional is the right source for how any specific decision would change a return.
What IRMAA Is
IRMAA stands for income-related monthly adjustment amount. It is an extra monthly charge added to the Medicare Part B premium and to Part D drug coverage for people whose income is above set thresholds. Social Security describes it plainly: if income is above a certain amount, a person pays an extra amount on top of the standard premium.
Two points are worth separating from the start.
It is not a penalty
IRMAA is not a fine for doing something wrong. It is how the Medicare program asks higher-income beneficiaries to cover a larger share of Part B costs. Social Security states that Part B premiums equal 35%, 50%, 65%, 80%, or 85% of the total cost of the coverage, depending on reported income, compared with the standard premium that most people pay.
It is not an Advantage plan or a Medigap charge
IRMAA is set by Social Security and Medicare, not by an insurance company. It applies on top of the Part B premium, and the Part D piece applies on top of whatever drug plan premium a household chooses.
The Two-Year Lookback
The feature that catches most people off guard is timing. Social Security uses the most recent federal tax return the IRS provides to it. Social Security’s page states that this is generally a return filed in 2025 for tax year 2024, and sometimes a return for tax year 2023.
That means the income reported on a tax return determines the Medicare premium two calendar years later.
| Income earned in | Tax return filed in | Medicare premium year affected | Status |
|---|---|---|---|
| 2024 | 2025 | 2026 | Official, per Social Security |
| 2025 | 2026 | 2027 | Follows the same pattern |
| 2026 | 2027 | 2028 | Follows the same pattern; income year still open |
Where these numbers come from: the 2024 to 2026 pairing is from Social Security’s page on Medicare premiums (ssa.gov, Medicare premiums: rules for higher-income beneficiaries). The 2025 to 2027 and 2026 to 2028 rows apply the same two-year pattern and are not separate official statements.
Tip from Alfred:
The premium letter is about the past. It reflects a tax return that is already filed. The part of the story that is still open is the year that has not ended yet.
What to Look for in the Mail
Social Security states that when a household must pay higher premiums, it sends a letter with the premium amount or amounts and the reason for its determination. The envelope comes from Social Security rather than from a Medicare plan, which is one reason it can be mistaken for routine mail. A household that is already paying the adjustment and later enrolls in the other program is told that no second explanation letter is sent.
The layout of the letter is not described on Social Security’s page, so the list below is a set of things households commonly compare, not a description of a form.
- The sender: Social Security, not a plan, a carrier, or an agent.
- The premium amounts: a Part B figure and, where it applies, a Part D adjustment, stated as monthly amounts.
- The reason: the letter explains why the amount is higher than standard. Households often look for which tax year was used and which income figure.
- The income figure against the return: the number Social Security used can be compared with the household’s own tax return for that year, line by line.
- The effective year: whether the amount applies to the coming calendar year.
- The path to a new decision: the letter points to how to ask Social Security to look again, including for a qualifying life event, covered below.
The 2026 Brackets (Official)
These are the published 2026 amounts. The standard Part B premium for 2026 is $202.90 a month, and the Part B deductible is $283 a year, according to Medicare.gov. The adjustments below are added to that standard premium.
| Income (single) | Income (married filing jointly) | Part B add-on, monthly | Part B total, monthly | Part D add-on, monthly |
|---|---|---|---|---|
| $109,000 or less | $218,000 or less | None | $202.90 | None |
| Above $109,000 to $137,000 | Above $218,000 to $274,000 | $81.20 | $284.10 | $14.50 |
| Above $137,000 to $171,000 | Above $274,000 to $342,000 | $202.90 | $405.80 | $37.50 |
| Above $171,000 to $205,000 | Above $342,000 to $410,000 | $324.60 | $527.50 | $60.40 |
| Above $205,000 and below $500,000 | Above $410,000 and below $750,000 | $446.30 | $649.20 | $83.30 |
| $500,000 or more | $750,000 or more | $487.00 | $690.00 | $91.00 |
Where these numbers come from: the income thresholds and the Part B and Part D adjustments are from Social Security’s 2026 premium chart (ssa.gov, Medicare premiums). The Part B total column adds each Part B adjustment to the $202.90 standard premium and is arithmetic, not a separate published figure. Social Security lists different, lower thresholds for people who are married, file separately, and lived with their spouse during the year.
Two features of this table matter for planning. The brackets are cliffs rather than slopes: income one dollar above a line moves the whole year into the next row, rather than adding a small amount. And the thresholds apply per person, so a married couple on Medicare, both enrolled in Part B, pays the adjustment for each.
What 2027 May Look Like (Projection)
Two inputs drive the 2027 picture. The first is the standard Part B premium. The 2026 Medicare Trustees Report estimates it at about $209.50 a month for 2027, up from $202.90. The second is the thresholds, which federal law indexes to inflation, using the average of the Consumer Price Index for All Urban Consumers over the 12 months ending in August of the prior year. If the thresholds rise by roughly the same percentage they rose in the past year, about 2.75%, they would land near the amounts below, rounded to the nearest $1,000 as Medicare does.
| Projected income (single) | Projected income (joint) | Projected Part B, monthly | Extra per person, per year |
|---|---|---|---|
| About $112,000 or less | About $224,000 or less | About $209.50 | None |
| Above about $112,000 | Above about $224,000 | About $293.30 | About $1,006 |
| Above about $141,000 | Above about $282,000 | About $419.00 | About $2,514 |
| Above about $176,000 | Above about $352,000 | About $544.70 | About $4,022 |
| Above about $211,000 | Above about $422,000 | About $670.40 | About $5,531 |
| $500,000 or more | $750,000 or more | About $712.30 | About $6,034 |
Where these numbers come from: the $209.50 premium is the estimate in the 2026 Medicare Trustees Report, not a CMS announcement. The monthly figures apply the same ratios that produce the official 2026 table (1.4, 2.0, 2.6, 3.2, and 3.4 times the standard premium) to that estimate. The thresholds are a calculation that applies roughly a 2.75% increase to the official 2026 thresholds, and the top bracket is shown unchanged at $500,000 and $750,000. The annual column is the difference from the standard premium multiplied by 12. Part D adjustments for 2027 are not projected here. The one official 2027 figure is the Part D national base beneficiary premium of $41.33, from CMS’s July 28, 2026 announcement.
Illustration: one dollar over the line
Illustration only, not a real household, and based on the projection above. A married couple, both on Medicare, files jointly. Their reported income comes in at the projected line of about $224,000 in one version, and about $225,000 in another.
In the first version, neither spouse is projected to owe an adjustment. In the second, each is projected to owe about $84 more a month for Part B, which is about $1,006 per person and about $2,011 for the couple over a year, before any Part D adjustment.
The point is the shape of the table, not the exact figures. A small difference in income, near a line, can produce a much larger difference in premiums.
What Counts as Income for IRMAA
Social Security states that the income measure is modified adjusted gross income, or MAGI, defined on its page as total adjusted gross income plus tax-exempt interest income. Two things follow.
It starts with the tax return
Adjusted gross income is a line on the federal tax return. Items that generally flow into it include wages, pension payments, the taxable part of Social Security benefits, interest and dividends, capital gains, rental income, business income, and taxable withdrawals from traditional retirement accounts, including required minimum distributions and the amount converted in a Roth conversion.
Tax-exempt interest is added back
Municipal bond interest is not taxed federally, but it is added to the figure Social Security uses. Qualified withdrawals from a Roth account are generally not part of adjusted gross income. Whether any particular item counts is a tax-reporting question, and the return and a tax professional are the places to confirm it.
Tip from Alfred:
A big one-time event, like selling a business, a property, or a large position, can lift one year’s income far above the years around it. The Medicare surcharge looks at that year, even when the following year looks completely different.
Why This Year’s Income Matters Most
It is late October 2026. For most households, the 2026 tax year is not finished. Under the two-year pattern in the table above, the income that ends up on the 2026 return is the income Social Security would generally use for the 2028 Medicare premium.
That makes the current year the one that is still moving. The 2024 and 2025 returns are filed and set. The 2026 return is not.
The way households tend to think about it in a retirement review is in terms of the sources of income they control, and the ones they do not. A required minimum distribution has a schedule set by federal rules. The timing of a stock sale, a Roth conversion, a withdrawal from a traditional account, or a part-year of work is often a choice. This guide does not say what anyone should do with any of those. The educational point is that these items all land in the same MAGI figure, and that figure becomes a Medicare premium two years later.
There is also a trade-off that tax professionals often raise. Actions that lower income in one year can raise taxes in another, and a conversion that increases this year’s income can reduce taxes later. Surcharge brackets are one input among many, and they are weighed alongside the income tax brackets, the taxation of Social Security benefits, and the household’s own timeline.
When Income Drops: Life-Changing Events
The two-year lookback can overstate current income. Someone who retired in 2025 may still be assessed on 2024 wages. Social Security addresses this through Form SSA-44, which asks it to use a more recent year when income has dropped because of a qualifying event. Social Security’s list of qualifying events includes:
- Marriage, divorce, or annulment
- The death of a spouse
- Work stoppage or reduction, including retirement
- Loss of income-producing property
- Loss of pension income
- An employer settlement payment
Each event has its own documentation, such as a marriage certificate, a divorce decree, a death certificate, an employer statement or pay stubs, or a pension administrator’s letter. Social Security’s form states that the event must fall in the same year as, or an earlier year than, the tax year Social Security is asked to use, and that the request is for a new decision rather than a formal appeal. A household that disagrees with the determination itself has the separate appeal route Social Security describes.
Tip from Alfred:
Medicare is one line in a retirement plan. Income, taxes, and healthcare costs sit on the same page, and the surcharge is where they meet.
Frequently Asked Questions
What does IRMAA stand for?
Income-related monthly adjustment amount. It is the extra amount added to the Part B premium and to Part D coverage for people above the income thresholds.
Which tax year does Social Security use?
Per Social Security, generally the most recent return the IRS provides, which for 2026 premiums was tax year 2024, and sometimes tax year 2023.
Does IRMAA apply to Medicare Advantage?
The Part B and Part D adjustments are set by Social Security and apply based on income, including for people in Medicare Advantage plans that include drug coverage. The details are on Social Security’s and Medicare.gov’s pages.
Are the 2027 figures final?
No. As of this writing, CMS has not published the official 2027 Part B premium or thresholds. The figures in the projection section are labeled estimates.
What if income went down because of retirement?
Social Security’s Form SSA-44 covers work stoppage or reduction, among other life-changing events, and lists the documentation required.
Who can answer questions about one household’s situation?
Social Security (1-800-772-1213), Medicare.gov, 1-800-MEDICARE, and the local State Health Insurance Assistance Program (SHIP) offer free information. A tax professional can speak to how items would appear on a return.
