One dollar over $109,000 MAGI on an MFS return triggers a $446 monthly Part B surcharge, skipping four brackets single filers climb gradually.
Dual MFS filers over $109,000 pay $649 monthly for Part B each, while a joint-filing couple at the same combined income pays zero IRMAA.
The two-year IRMAA lookback locks in MFS surcharges: a separate 2024 return means paying the penalty in 2026 with no re-filing escape.
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Filing status is a Medicare setting couples should check before April 15, and too few do. A married Medicare beneficiary who lived with their spouse at any point during the tax year and files a separate return runs into an IRMAA schedule that behaves nothing like the one built for single or joint filers. The ramp is brutally steep: one dollar over the first threshold and the surcharge lands almost at the top of the ladder.
Only about 8% of Part B enrollees pay any IRMAA at all. The couples this hits hardest are the ones who separated their returns for a specific reason (income-driven student loan repayment, liability protection, a messy year with a spouse in business), did not model the Medicare consequence, and now own two premiums that look like luxury car payments.
For 2026, the Centers for Medicare & Medicaid Services set the standard Part B premium at $202.90 per month. Single and joint filers who cross into IRMAA territory move through five intermediate tiers before hitting the top surcharge. A single filer between $109,000 and $137,000, for example, pays a modest $81.20 monthly surcharge, for a total premium of $284.10.
Now compare the MFS-who-lived-with-spouse schedule for full Part B coverage in 2026:
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Source: Yahoo Finance Top News — This article was automatically imported from the source. Read full article at original source →
