Nearly 8 percent of all Medicare Part B enrollees pay an income-related surcharge — and most of them have no idea it was triggered by income they earned two years ago. I found that out the hard way in , staring at a Medicare premium notice that was $185 higher per month than I expected.
Your Modified Adjusted Gross Income (MAGI) from your 2024 tax return determines your 2026 Medicare Part B premium, your eligibility for certain tax deductions, and whether you owe more in net investment income tax. A single dollar over the threshold can cost you $888 more per year in premiums alone. This article explains the numbers, the dates, and what I am doing about it.
My 2024 Tax Return Is Driving My 2026 Medicare Bill
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I am Sloane Avery Wren. I turned 65 in and enrolled in Medicare Part B. My husband and I filed jointly in for tax year 2024. We reported combined MAGI of $224,000 — mostly from my husband’s consulting income and a Roth conversion I completed in .
I did not connect those dots until the Medicare notice arrived. If your modified adjusted gross income as reported on your IRS tax return from two years ago is above a certain amount, you will pay more than the standard Part B premium. In my case, that “two years ago” year was 2024. The two-year lookback is real, and it blindsided me.
The standard 2026 Part B premium is $185.00 per month. Because our joint MAGI exceeded $212,000, we landed in the second IRMAA tier. We each pay $259.00 per month — that is $888 more per year per person, or $1,776 more combined, compared to the standard rate. That is roughly what we spend on groceries for six weeks.
Part B Premium/mo
Premium/mo (IRMAA)
Qualified Tips Deduction
Lookback Period
What MAGI Actually Is — And Why It Is Not Your W-2 Income
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This is where most people get confused, including me at first. Your W-2 wages, your 1099 freelance income, your pension — those feed into your Adjusted Gross Income (AGI) on Form 1040. But modified adjusted gross income adds certain amounts back to your AGI, depending on which benefit or rule is being tested.
For Medicare IRMAA purposes, MAGI equals AGI plus any tax-exempt interest income. That sounds narrow. But it catches people who hold municipal bonds — income they assumed was “invisible” to the IRS. For other calculations, like the Net Investment Income Tax (NIIT), additional items get added back in.
The Roth conversion I did in increased my AGI directly. Converted amounts count as ordinary income. That pushed us above the $212,000 joint IRMAA threshold for . I wish I had modeled that impact before pulling the trigger.
| Individual MAGI (2024) | Joint MAGI (2024) | Monthly Premium | Annual Cost |
|---|---|---|---|
| ≤ $106,000 | ≤ $212,000 | $185.00 | $2,220 |
| $106,001–$133,000 | $212,001–$266,000 | ||
| $106,001–$133,000 | $212,001–$266,000 | $259.00 | $3,108 |
| $133,001–$167,000 | $266,001–$334,000 | $370.00 | $4,440 |
| $167,001–$200,000 | $334,001–$400,000 | $480.90 | $5,770 |
| $200,001–$500,000 | $400,001–$750,000 | $591.90 | $7,102 |
| Above $500,000 | Above $750,000 | $628.90 | $7,546 |
Source: CMS.gov. Part B premiums above are monthly. Brackets use MAGI reported on your tax return.
A single filer crossing $106,000 by just $1 pays an extra $888 per year. That is the classic IRMAA cliff. Medicare Part D premiums carry their own parallel IRMAA surcharges. Check current Part D IRMAA amounts at medicare.gov.
CMS uses MAGI from two years prior. In , your premium is based on income. If your income dropped — due to retirement, divorce, or death of a spouse — you can request a reconsideration using Form SSA-44, available at ssa.gov.
MAGI and IRA Contribution Eligibility in 2026
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MAGI directly controls whether you can deduct a traditional IRA contribution or contribute to a Roth IRA at all. The IRS sets phase-out ranges annually. Here are the limits based on IRS guidance. Verify the latest at irs.gov.
| Account Type | Filing Status | Phase-Out Starts | Phase-Out Ends |
|---|---|---|---|
| Roth IRA | Single / HOH | $150,000 | $165,000 |
| Roth IRA | Married Filing Jointly | $236,000 | $246,000 |
| Traditional IRA (covered by workplace plan) | Single | $79,000 | $89,000 |
| Traditional IRA (covered by workplace plan) | Married Filing Jointly | $126,000 | $146,000 |
| Traditional IRA (spouse has workplace plan) | Married Filing Jointly | $236,000 | $246,000 |
Once your MAGI clears the phase-out ceiling, your Roth IRA contribution limit drops to $0. The backdoor Roth IRA is a common workaround. However, the pro-rata rule complicates that strategy if you hold pretax IRA balances. I am not a tax advisor. Discuss this with a CPA or enrolled agent before acting.
⚠️ Important: The MAGI used for Roth IRA eligibility differs slightly from the MAGI used for IRMAA. The IRS calculation for IRA purposes adds back student loan interest and tuition deductions. See IRS Publication 590-A for the precise worksheet.
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