Crossing the $109,000 MAGI threshold by a single dollar as a single filer jumps your 2026 Medicare Part B premium from $202.90 to $284.10 monthly, a $974 annual increase triggered by tax return income from two years prior.
If your income dropped significantly after retirement, filing form SSA-44 with Social Security can eliminate or reduce IRMAA surcharges based on outdated earnings, with potential savings reaching thousands of dollars annually.
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Most retirees on Medicare are paying $202.90 a month for Part B coverage in 2026. A smaller group pays $689.90. That gap of nearly $487 a month stems from IRMAA (Income-Related Monthly Adjustment Amount), a rule that catches many retirees off guard because of financial decisions made years earlier.
Medicare looks back two years. Your 2026 Part B premium is based on your 2024 Modified Adjusted Gross Income (MAGI). For single filers, the standard $202.90 premium rate applies only if your 2024 MAGI was $109,000 or below. Cross that line by one dollar and the surcharge kicks in immediately.
A single filer at $109,001 pays $284.10 a month, an $81.20 jump for one dollar of extra income. Over a year, that is $974 more. For a couple where both spouses are on Medicare, the same one-dollar overage costs $1,948 extra per year.
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The 2026 tier structure for single filers:
$109,000 or below: $202.90/month
$109,001 to $137,000: $284.10/month
$137,001 to $171,000: $405.80/month
$171,001 to $205,000: $527.50/month
$205,001 to $500,000: $649.20/month
Above $500,000: $689.90/month
For married couples filing jointly, all thresholds double.
What you don’t know can cost you. A large Roth conversion adds directly to MAGI in the year it happens, showing up in your Medicare premium two years later. Selling a home with gains above the $500,000 couples exclusion pushes the excess into MAGI. Required minimum distributions (RMDs), which retirees must take from traditional IRAs starting at 73, can nudge income over a threshold.
