2027 IRMAA Brackets: Projected Thresholds and How to Plan Around Them
The official 2027 IRMAA brackets will not be published until the fall of 2026, but most of the inflation data that sets them is already in. Here is what planners are projecting, why the top tier is frozen, and what it means for income you earn in 2025.
The projections
Best available 2027 thresholds (2025 income)
The 2027 IRMAA year is based on your 2025 MAGI, which is the tax year that just ended or is ending now. CMS adjusts the lower brackets for inflation each year; the top bracket is frozen by statute through 2028. Here is the current consensus projection:
| Tier | Single MAGI | Joint MAGI | Part B multiple |
|---|---|---|---|
| Standard (no IRMAA) | $112,000 or less | $224,000 or less | 1.0x |
| Tier 1 | $112,001 to $141,000-$142,000 | $224,001 to $282,000-$284,000 | 1.4x |
| Tier 2 | $142,000-$142,000 to $176,000-$177,000 | $284,000 to $352,000-$354,000 | 2.0x |
| Tier 3 | $177,000 to $211,000-$212,000 | $354,000 to $422,000-$424,000 | 2.6x |
| Tier 4 | $212,000 to $500,000 | $424,000 to $750,000 | 3.2x |
| Tier 5 (top) | $500,000 or more | $750,000 or more | 3.4x |
Projections based on CMS inflation-adjustment methodology as reported by planning analysts (fall 2026). The middle-tier numbers carry a $1,000 range for single filers ($2,000 for joint) depending on which inflation data CMS uses. These are not official figures.
Read the ranges, not the points. CMS can calculate the brackets using either 11 or 12 months of inflation data, and the two methods differ by $1,000 for single filers and $2,000 for joint filers. If you are planning 2025 income against these numbers, treat the top of each range as the line, not the midpoint.
Why the top tier is frozen (and why that matters)
The Bipartisan Budget Act froze the top IRMAA bracket at $500,000 single / $750,000 joint through 2028. Every other bracket creeps up with inflation; this one does not move at all. The result is bracket creep at the top: as inflation pushes incomes higher, more retirees drift into the top bracket even though their purchasing power has not improved. If you are anywhere near Tier 4, watch this line especially carefully, because it is the one that never moves to meet you.
The surcharges themselves are also rising. Early estimates put the 2027 standard Part B premium up about 7.75%, with IRMAA surcharges climbing roughly in line, and the top bracket seeing increases over 9%. Part D surcharges are projected up about 6%. So even if your tier does not change, the dollar cost of each tier goes up.
What this means for 2025 income, right now
Here is the part with teeth: your 2025 MAGI is already set, or nearly set. The 2025 tax year determines your 2027 IRMAA. If you are reading this in the fall of 2026, most of 2025 is behind you and the number is close to final. But there is still a planning lesson that applies forward:
- If you landed near a line, know which one. A single filer at $140,000 of 2025 MAGI is inside projected Tier 1 with about $1,000 to $2,000 of headroom. That is a comfortable margin for 2027 but a warning for 2026 income (which sets 2028 IRMAA).
- The 2028 line is already taking shape. Early projections put the 2028 standard threshold around $114,000 to $116,000 single and $228,000 to $232,000 joint, based on 2026 income. If you are a married couple, keeping 2026 MAGI under about $228,000 should keep you clean.
- Plan with a buffer, always. One planner's rule of thumb: if you are anywhere near a threshold, plan to finish a few thousand below it, because the projections have a $1,000 to $2,000 uncertainty band and surprise distributions do not care about your spreadsheet.
How the projections are built (and their limits)
IRMAA thresholds are indexed to the Consumer Price Index for All Urban Consumers (CPI-U). The formula takes the average CPI-U over a 12-month window, compares it to a base period average (September 2017 to August 2018), and scales the 2019 brackets by the percentage change, rounded to the nearest $1,000. The top bracket is excluded from this adjustment until 2028.
The limits of this method: inflation in the final months of the window can still shift the number, CMS's choice of 11 versus 12 months of data moves the result, and Congress could always change the law. Treat every projection as a planning guidepost, not a promise. The official numbers arrive each fall, typically by the first week of November, and the 2026 IRMAA calculator on this site will be updated when they do.
What to do this fall
- Project your 2026 MAGI now. 2026 income sets 2028 IRMAA, and unlike 2025, you still have months to shape it. Use the projected $114,000 to $116,000 single / $228,000 to $232,000 joint lines as your guardrails.
- Do your Roth conversion math against the 2028 projection. A conversion in 2026 lands in your 2026 MAGI, which sets 2028 IRMAA. Size it so you finish under your target line, with buffer.
- If 2025 already pushed you into a tier, check whether a life-changing event appeal applies to you. Retirement, reduced work, divorce, or the death of a spouse can let SSA use your current income instead of the 2025 figure.
- Recheck in November when CMS publishes the official 2027 brackets. Replace projections with facts and finalize any year-end moves.
Frequently Asked Questions
When will the official 2027 IRMAA brackets be announced?
Typically by the first week of November 2026, when CMS releases the annual Medicare premiums and deductibles fact sheet. The 2027 brackets apply to 2027 premiums and are based on 2025 MAGI.
Which tax year's income determines my 2027 IRMAA?
Your 2025 tax return. The two-year lookback means 2025 income sets 2027 premiums, 2026 income sets 2028 premiums, and so on.
Will the top IRMAA bracket ever adjust for inflation?
Under current law, the top bracket ($500,000 single / $750,000 joint) stays frozen through 2028 and then resumes inflation adjustment. Congress could change this, but as of now, 2028 is the first year it can move.
How accurate are IRMAA projections usually?
Close on the direction, usually within $1,000 to $2,000 of the final number once most of the inflation data is in. The residual uncertainty comes from the final months of CPI data and CMS's methodological choice. Near a threshold, that $2,000 is the whole ballgame, which is why buffers matter more than precision.