Congress Eyes IRMAA Reform:
What Proposed Changes Could Mean

IRMAA's Expanding Reach

When IRMAA was introduced in 2007 as part of the Medicare Modernization Act, it applied to roughly 5% of Medicare beneficiaries. The surcharge was designed to ensure that higher-income enrollees paid more for Medicare Part B, and later Part D, with the expectation that the vast majority of retirees would never encounter it.

That assumption has shifted. As incomes have risen over nearly two decades while certain bracket thresholds have not kept pace with actual income growth, a larger share of Medicare enrollees now falls above the surcharge line. What was originally a narrowly targeted provision is gradually becoming a factor for a broader population of retirees, particularly those with pensions, investment income, Required Minimum Distributions, and Social Security benefits that collectively push MAGI above the first threshold.

This expansion is not a crisis, but it is a measurable trend, and it is one reason IRMAA's structure has drawn increasing attention from policymakers and advocacy organizations.

The Top-Tier Freeze: What It Is and Why It Matters

The 2026 IRMAA bracket structure includes five surcharge tiers above the standard premium. The lower four tiers adjust annually based on the Consumer Price Index for All Urban Consumers (CPI-U), which means thresholds move upward over time to account for inflation. The top tier, however, does not follow this pattern.

The highest bracket, set at $500,000 for single filers and $750,000 for joint filers, is frozen through at least 2028. Unlike the inflation-adjusted tiers below it, this threshold remains flat regardless of changes in the cost of living or income growth. The result is straightforward: as incomes rise due to inflation, investment returns, or growing RMDs, more individuals cross into the top tier each year even if their purchasing power has not meaningfully changed.

At the top tier, enrollees pay $689.90 per month for Part B plus a $91.00 monthly Part D surcharge, resulting in a maximum annual IRMAA exposure of $6,936 per person. The freeze means this threshold will continue to capture a growing number of earners each year until Congress either adjusts it or allows the freeze to expire.

Bracket Creep Explained

Even the inflation-adjusted tiers may not fully protect retirees from gradually moving into higher surcharge levels. The reason is that several common income sources tend to grow at rates that outpace CPI-U bracket adjustments.

Social Security benefits receive annual cost-of-living adjustments (COLAs) that increase the taxable portion of benefits each year. Required Minimum Distributions grow as account balances appreciate and as the required distribution percentage increases with age. Pension income, for those with fixed or step-increase pensions, may also push total MAGI upward over time.

A retiree whose real purchasing power remains essentially flat can still find their MAGI creeping into a higher IRMAA tier, not because they are earning more in any meaningful sense, but because the combination of indexed income sources grows faster than the bracket thresholds move. This phenomenon is sometimes called bracket creep, and it is one of the structural features of IRMAA that reform discussions have repeatedly highlighted.

How IRMAA Has Evolved Since 2007

IRMAA's basic design has remained consistent since its introduction, but the details have changed. When it launched in 2007, the surcharge applied through three income tiers above the standard premium. In 2018, a fourth and fifth tier were added, expanding the bracket structure to its current five-tier format and creating a higher maximum surcharge for the highest earners.

Throughout these changes, one structural feature has remained unchanged: the cliff design. Each tier operates as a hard threshold. There is no gradual phase-in between levels. If your MAGI falls below a threshold by any amount, you pay the lower rate. If it crosses that threshold by even 1 cent, you pay the full surcharge for the next tier. The surcharge amounts and the income thresholds have changed over the years, but this fundamental cliff mechanism has not.

The Part D surcharge was also added after the original IRMAA legislation, layering an additional cost on top of Part B for those in higher tiers. Today, the combined annual surcharge exposure at the top bracket reaches $6,936 per person, a figure that draws meaningful attention during retirement income planning.

What Reform Proposals Typically Address

Over the years, various proposals and policy discussions have focused on several recurring themes related to IRMAA reform. These are not tied to any single piece of legislation currently pending. Rather, they represent the types of structural changes that have been raised in congressional hearings, policy briefs, and advocacy efforts:

• Smoothing the cliffs into a gradual phase-in: Replacing the hard thresholds with a sliding scale so that surcharges increase incrementally rather than jumping by hundreds of dollars at a single penny
• More aggressive inflation adjustments: Tying bracket thresholds to a broader inflation measure or adjusting them at a rate that better reflects actual income growth among retirees
• Eliminating the top-tier freeze: Allowing all tiers, including the highest bracket, to adjust annually for inflation rather than holding them flat
• Revising the two-year lookback: Using more current income data to determine surcharges, rather than relying on the tax return from two years prior, which may not reflect a retiree's actual financial situation
• Changing how specific income types are counted: Proposals have discussed whether Roth conversion amounts, municipal bond interest, or other specific income sources should be treated differently in the MAGI calculation for IRMAA purposes

None of these changes are guaranteed, and the timeline for any legislative action remains uncertain. But the frequency with which these themes appear in policy discussions suggests that IRMAA's current structure is a recognized area of concern among both lawmakers and the retirement planning community.

What a Cliff-to-Slope Change Would Mean

Of all the reform ideas that have been discussed, the most commonly cited is the shift from a cliff structure to a gradual phase-in. Understanding why requires looking at how the current cliffs actually work in practice.

The cliff design creates a planning environment where precision matters enormously. A Roth conversion, a capital gain, or even a Social Security COLA that pushes MAGI one penny past a threshold can result in thousands of dollars in additional annual premiums. A slope-based system would reduce that sensitivity and make the surcharge calculation more proportional to actual income.

Planning Regardless of Reform

The most important takeaway from any discussion of potential IRMAA reform is this: do not wait for Congress to act. Legislative change is inherently uncertain, and even proposals with broad conceptual support can take years to move through the process. There is no reliable timeline for when, or whether, any of these structural changes will be enacted.

The strategies that reduce IRMAA exposure today work regardless of whether reform happens. Roth conversions completed during the optimal window of ages 60 to 63 reposition assets so that future distributions are excluded from MAGI entirely. Qualified Charitable Distributions of up to $108,000 per year allow those aged 70.5 and older to satisfy charitable giving goals without increasing MAGI. Careful income timing, tax-loss harvesting, and coordination with a tax professional can help manage where MAGI falls relative to the current bracket thresholds.

The strategies that work must be in place two years before you enroll. That timeline does not change based on what Congress may or may not do. For a detailed overview of the most commonly considered approaches, visit our IRMAA avoidance strategies guide.

It is also worth noting that IRMAA surcharges may qualify as deductible medical expenses on Schedule A if your total medical costs exceed 7.5% of your adjusted gross income. This does not eliminate the surcharge, but it may soften the impact at tax time. Consult a tax professional to determine if this applies to your situation.

If reform does eventually arrive, retirees who have already positioned their income and assets will be in a stronger position to benefit from any changes. Planning now is not a bet against reform. It is a hedge against the possibility that reform takes longer than expected, or looks different than anticipated.

Sources

• Centers for Medicare & Medicaid Services, "2026 Medicare Parts A & B Premiums and Deductibles," cms.gov
• Social Security Administration, "Medicare Premiums: Rules for Higher-Income Beneficiaries," ssa.gov
• Medicare Prescription Drug, Improvement, and Modernization Act of 2003 (Public Law 108-173), Section 811
• Bipartisan Budget Act of 2018 (Public Law 115-123), Section 53114
• U.S. Bureau of Labor Statistics, "Consumer Price Index for All Urban Consumers (CPI-U)," bls.gov