No official 2027 IRMAA brackets exist yet. The Centers for Medicare & Medicaid Services (CMS) will not confirm the actual 2027 income thresholds until around November 2026, after the government finishes averaging inflation data through August 2026. Based on current projections, the 2027 IRMAA threshold for single filers is expected to land somewhere around $112,000 to $113,000, up from $109,000 in 2026, with married filing jointly thresholds around double that. The single most important thing to understand is that IRMAA always uses a two-year lookback: your 2027 surcharge will be based on your 2025 Modified Adjusted Gross Income (MAGI), not your income in 2027 itself. If you are making income decisions right now in 2026 thinking about next year's Medicare premium, you are actually one year too late for 2027 and one year early for 2028.
The Two-Year Lookback Is the Rule Almost Everyone Gets Wrong
IRMAA (Income-Related Monthly Adjustment Amount) is the surcharge Medicare adds to Part B and Part D premiums for people whose income exceeds a set threshold. Social Security determines whether you owe IRMAA by pulling your federal tax return from two years before the premium year in question.
That means:
- Your 2026 IRMAA is based on your 2024 MAGI.
- Your 2027 IRMAA will be based on your 2025 MAGI.
- Your 2028 IRMAA will be based on your 2026 MAGI.
This is why so many retirees are blindsided. A large Roth conversion, a big capital gain, or a lump-sum retirement account withdrawal in 2025 will not raise your premium in 2025. It raises your premium in 2027, when you may have already moved to a lower income year and forgotten about the transaction that triggered it. If you are trying to manage your 2027 Medicare costs, the tax return that matters is the one you file for 2025, covering income you already earned or are still earning as you read this. There is no way to undo 2025 income now that the year is closing out, but you can still plan around 2026 income to manage your 2028 IRMAA exposure.
Why 2027 Brackets Cannot Be Finalized Yet
IRMAA thresholds are indexed to inflation using the average Consumer Price Index for All Urban Consumers (CPI-U) measured from September of the prior year through August of the current year. For the 2027 brackets, that means CMS needs the full run of CPI-U data from September 2025 through August 2026 before it can calculate and publish final numbers.
As of mid-2026, that data set is incomplete. Several forecasters, including the widely cited financial planning site The Finance Buff, have noted that a federal government shutdown disrupted the October 2025 CPI release, forcing analysts to estimate 2027 brackets using fewer data points than usual. CMS itself typically does not confirm the coming year's IRMAA brackets, along with the standard Part B premium and deductible, until its annual announcement in the first week of November. For 2027, that announcement is expected around November 2026.
Until that announcement, every number below is a projection, not a fact. Treat it as a planning range, not a confirmed figure.
2026 Official IRMAA Brackets (Confirmed, for Reference)
These are the current, confirmed brackets, based on 2024 MAGI, and they are the baseline every 2027 projection builds from.
| 2024 MAGI (Single) | 2024 MAGI (Married Filing Jointly) | Total 2026 Part B Premium |
|---|
| Up to $109,000 | Up to $218,000 | $202.90/mo |
| $109,001 to $137,000 | $218,001 to $274,000 | $284.10/mo |
| $137,001 to $171,000 | $274,001 to $342,000 | $405.80/mo |
| $171,001 to $205,000 | $342,001 to $410,000 | $527.50/mo |
| $205,001 to $499,999 | $410,001 to $749,999 | $649.20/mo |
| $500,000 or more | $750,000 or more | $689.90/mo |
2027 Projected IRMAA Brackets (Not Official, Based on 2025 MAGI)
The table below reflects current projections from Medicare cost forecasters, using the CPI-U data available as of mid-2026. These numbers assume moderate inflation between June and August 2026 and a standard Part B premium projection of approximately $209.50, drawn from the 2026 Medicare Trustees Report. Private forecasters have suggested the actual 2027 base premium could run higher, closer to $216 to $219, which would push every IRMAA tier above the figures shown here.
These are projections only. CMS has not confirmed any of these numbers. Official figures are expected around November 2026.
| 2025 MAGI (Single, projected) | 2025 MAGI (MFJ, projected) | Projected Total Part B Premium |
|---|
| Up to approximately $112,000 to $113,000 | Up to approximately $224,000 to $226,000 | approximately $209.50 to $219/mo |
| approximately $113,000 to $142,000 | approximately $226,000 to $284,000 | approximately $293 to $306/mo |
| approximately $142,000 to $177,000 | approximately $284,000 to $354,000 | approximately $419 to $437/mo |
| approximately $177,000 to $212,000 | approximately $354,000 to $424,000 | approximately $545 to $568/mo |
| approximately $212,000 to $500,000 | approximately $424,000 to $750,000 | approximately $670 to $700/mo |
| $500,000 or more (frozen threshold) | $750,000 or more (frozen threshold) | approximately $712 to $744/mo |
Two details matter here. First, the top bracket threshold ($500,000 single, $750,000 married) is set by statute and frozen from inflation adjustments until 2028, so it is one of the few figures in this table that is unlikely to change regardless of how CPI-U comes in. Second, every other threshold in this table is a range, not a point estimate, because forecasters are working from partial CPI data. As more months of 2026 inflation data become available, these ranges will narrow.
Why Different Forecasters Show Different Numbers
If you search around, you will find slightly different projected 2027 IRMAA figures from different sources. This is not because anyone is wrong. It reflects three real sources of uncertainty:
- Incomplete CPI-U data. The formula needs 12 months of data (September 2025 through August 2026). Mid-year forecasts are built on 8 to 11 months of actual data plus assumed inflation for the remaining months.
- The 2025 government shutdown gap. The Bureau of Labor Statistics did not publish a standard CPI report for October 2025, which forced forecasters to estimate that month rather than use a hard number.
- Rounding rules. IRMAA thresholds round to the nearest $1,000, so small differences in the underlying inflation assumption can either push a bracket up by $1,000 or leave it unchanged, depending on which side of the rounding line the raw number falls.
None of this changes the direction of the trend. Every credible forecast agrees 2027 thresholds will be higher than 2026 thresholds. The disagreement is only about exactly how much higher.
What to Do If You're Planning Around 2027 IRMAA Right Now
- Look at your 2025 tax return, not your 2027 income. Your 2027 IRMAA is locked in by what you report for 2025. If you have not filed your 2025 return yet, there is still time to review contributions, deductions, and any planned Roth conversions before the filing deadline.
- Use the 2026 confirmed brackets as your working estimate, adjusted up slightly. Since projected 2027 thresholds are running roughly 3% to 4% above 2026 levels, you can get a reasonable planning estimate by adding that percentage to the 2026 numbers above.
- Do not assume you owe IRMAA for 2027 just because you were close to a bracket in 2025. Brackets move up each year. Income that put you in a surcharge tier in an earlier year may fall below the new, higher 2027 threshold once it is finalized.
- Watch for the CMS announcement in November 2026. That is when the actual 2027 Part B and Part D premiums, deductibles, and IRMAA brackets become official. Bookmark the CMS.gov Medicare costs page and check back then rather than relying on projections after that date.
- If your 2025 income was unusually high due to a one-time event, prepare Form SSA-44 now. This form lets you report a life-changing event, such as retirement, loss of a pension, or a work-reduction, that lowered your income after the tax year used to calculate your IRMAA. It does not undo the two-year lookback, but it can reduce or eliminate a surcharge tied to income that no longer reflects your current situation.
How the Two-Year Lookback Affects Common Life Events
| If this happened in 2025 | It affects your premium in |
|---|
| Large capital gain from selling investments | 2027 |
| Roth IRA conversion | 2027 |
| Retired mid-year, income dropped significantly | 2027 (appeal available via SSA-44) |
| Required minimum distribution from a 401(k) or IRA | 2027 |
| One-time inheritance reported as taxable income | 2027 |
Frequently Asked Questions
When will the official 2027 IRMAA brackets be announced?
CMS typically announces the coming year's Medicare Part B and Part D premiums, deductibles, and IRMAA brackets in the first week of November. For 2027, that announcement is expected around November 2026. Until then, any 2027 figures you see, including the ones in this article, are projections based on partial inflation data.
What income year determines my 2027 IRMAA?
Your 2025 Modified Adjusted Gross Income (MAGI), reported on your 2025 federal tax return, determines your 2027 IRMAA. Medicare and Social Security always use a two-year lookback, so 2027 premiums are never based on 2027 income.
Will the 2027 IRMAA threshold really go up from $109,000?
Current projections suggest the base 2027 threshold for single filers will land somewhere between approximately $112,000 and $113,000, but this is not confirmed. All IRMAA thresholds except the top bracket are indexed to inflation and have increased most years. The final number depends on CPI-U data through August 2026 that is not yet fully available.
Can I appeal a 2027 IRMAA surcharge before it is even announced?
No. You cannot appeal a surcharge that has not been assessed yet. Once you receive your 2027 IRMAA determination notice from Social Security, typically in late 2026, you can file Form SSA-44 if you experienced a qualifying life-changing event, such as retirement, marriage, divorce, or the death of a spouse, that reduced your income after the 2025 tax year used to calculate the surcharge.
Is the top IRMAA bracket ($500,000/$750,000) going to change for 2027?
Unlikely. That threshold was frozen by law and is not scheduled to be adjusted for inflation until 2028. The four lower brackets are indexed annually and are the ones expected to rise for 2027.
Where can I check the official 2027 numbers once they are released?
CMS publishes official Medicare Part A, Part B, and Part D costs, along with the IRMAA bracket table, on its Medicare costs page each November. Search "Medicare costs [year]" on CMS.gov once the announcement window opens, rather than relying on projection articles like this one after the official release date.
Does IRMAA apply to Medicare Advantage plans directly?
Not directly. IRMAA is added to your Part B premium and, if you have a Part D drug plan (including drug coverage bundled into a Medicare Advantage plan), to that premium as well. It is not a separate Medicare Advantage plan charge, but if your Medicare Advantage plan includes Part D coverage, the Part D IRMAA surcharge still applies and is billed separately from your plan premium.
