The $109,000 Income Threshold That Triggers a $1,148 Medicare Surcharge Most Retirees Miss

2 days ago 6

David Beren

Thu, June 11, 2026 astatine 7:29 AM CDT 6 min read

Quick Read

One dollar implicit the $109,000 MAGI threshold locks successful a $1,148 yearly Medicare surcharge calculated from taxation returns filed 2 years earlier.
Tax-exempt municipal enslaved involvement counts toward IRMAA's MAGI, pushing a retiree with $108,400 AGI and $900 successful muni involvement past the threshold.
Widowed spouses look a filing-status trap wherever income safely wrong the $218,000 associated bracket tin abruptly transcend the $109,000 azygous threshold.
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Fewer than 1 successful 10 Medicare beneficiaries pays an Income-Related Monthly Adjustment Amount, truthful a scholar whose household income sits good nether the archetypal tier tin halt here. Everyone other should support reading. The archetypal tier catches a azygous filer whose 2024 modified adjusted gross income tops $109,000, oregon a associated filer supra $218,000, and it adds a 2026 surcharge to some Part B and Part D premiums.

Medicare conception constitute connected medicare signifier with substance Medicare Part A, Part B, Paert A connected Blue Table.

The Scenario

A 67-year-old retiree files a azygous instrumentality for taxation twelvemonth 2024. Her adjusted gross income reads $108,400. She besides collected $900 successful tax-exempt municipal enslaved interest, which she assumed stayed invisible due to the fact that it escapes national income tax. The Social Security Administration adds that enactment 2a involvement to her enactment 11 AGI, arrives astatine $109,300 of MAGI, and drops her into the archetypal IRMAA bracket for 2026. Her January 2026 premium announcement lands higher than she expected, and the surcharge rides each monthly premium for the remainder of the year.

The Cliff, the Lookback, and the Math

IRMAA runs connected a two-year income lookback, truthful 2024 MAGI sets 2026 premiums. Her 2024 instrumentality is already filed, which locks the 2026 surcharge successful place. Looking ahead, 2025 income volition thrust 2027, and 2026 income volition thrust 2028. She cannot unwind income she has already reported, truthful lone future-year MAGI stays wrong her control.

The archetypal tier works arsenic a cliff: 1 dollar implicit the threshold triggers the full surcharge. For 2026, that surcharge arrives successful 2 pieces:

Part B adds $81.20 per period connected apical of the $202.90 modular premium, for a full of $284.10 per month.
Part D adds $14.50 per period connected apical of immoderate the program charges.

Together they travel to $95.70 per month, oregon astir $1,148 per year, per person. When some spouses enroll and their associated instrumentality tops $218,000, each enrollee pays the surcharge separately.

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