Does filing taxes separately lower my Medicare IRMAA?
Usually not. If you lived with your spouse during the year, the first IRMAA line drops to $109,000 and the next tier is a steep jump.
The short answer
For most couples, filing separately makes IRMAA worse. If you filed separately and lived with your spouse at any point during the year, the tables are much tighter than the joint ones.
The 2026 numbers side by side
| Filing status | Income | Part B + Part D surcharge / month |
|---|---|---|
| Married filing jointly | Up to $218,000 | $0 |
| Married filing jointly | $218,001 to $274,000 | $95.70 each |
| Separately (lived together) | Up to $109,000 | $0 |
| Separately (lived together) | $109,001 to $390,999 | $529.60 |
| Separately (lived together) | $391,000 or more | $578.00 |
The separate-filer amounts are Part B $446.30 plus Part D $83.30, and $487.00 plus $91.00 at the top.
An example
A couple has $200,000 of combined income. Filing jointly, they are under the $218,000 line and pay no surcharge. Filing separately with $150,000 and $50,000, the higher earner is over $109,000 and pays $529.60 a month, about $6,355 a year, for being on Medicare.
Is there any case where it helps?
Only in a very lopsided, high-income situation. Suppose one spouse has about $400,000 and the other about $20,000. Filing jointly, the $420,000 combined income puts both in the $410,000 to $750,000 tier, and each pays $529.60. Filing separately, only the high earner pays, $578.00. Even then, filing separately usually raises your income tax by more than it saves, so it is rarely worth doing for Medicare alone.
Check your joint tier → · What income counts →
Common questions
What if my spouse and I lived apart all year?
Social Security applies different rules in that case. The table above is for people who lived with their spouse at some point in the year, so check the CMS fact sheet or ask Social Security if that is you.
Do both spouses pay IRMAA when we file jointly?
The surcharge is charged for each person who is on Medicare, based on your combined joint income. A spouse who is not on Medicare does not pay it.
Where do these amounts come from?
From the CMS 2026 fact sheet on Medicare Part B and Part D premiums and income-related adjustments.
Keep reading
Sources: CMS: 2026 Part B premiums and IRMAA; SSA: Medicare premiums