IRMAA when married filing separately
If you file married filing separately and lived with your spouse at any time during 2024, Social Security sets your 2026 Medicare premiums from a separate three-row IRMAA table instead of the standard six-tier schedule. The first dollar of 2024 MAGI over $109,000 costs $446.30 a month of Part B IRMAA plus $83.30 for Part D: $529.60 a month, $6,355.20 a year. The three intermediate tiers a single filer passes through between $109,000 and $205,000 do not exist on this table. Couples who lived apart for the entire year can ask SSA to apply the single-filer thresholds instead.
What are the 2026 IRMAA brackets for married filing separately?
Three rows cover every separate filer who lived with a spouse at some point in 2024: no surcharge, the 80% tier, and the 85% tier, with nothing in between. The percentages are the share of Part B program cost each row's premium covers, the same top two rungs of the standard schedule. How MAGI is calculated for IRMAA is unchanged by filing status; what changes is the table it is read against.
| MAGI | Part B IRMAA | Total Part B premium | Part D IRMAA |
|---|---|---|---|
| ≤ $109,000 | $0.00 | $202.90 | $0.00 |
| > $109,000 – < $391,000 | $446.30 | $649.20 | $83.30 |
| ≥ $391,000 | $487.00 | $689.90 | $91.00 |
Source: CMS, 2026 fact sheet. If you lived apart from your spouse for all of 2024, SSA uses the single-filer table instead; see the married filing separately guide.
Restating the rows: 2024 MAGI of $109,000 or less carries no surcharge, just the standard $202.90 Part B premium (its history is on the 2026 Part B premium page). MAGI above $109,000 and under $391,000 means $649.20 a month for Part B, of which $446.30 is IRMAA, plus an $83.30 Part D adjustment stacked on whatever your drug plan charges. MAGI of $391,000 or more means $689.90 for Part B plus $91.00 for Part D. Both Part D amounts are paid to Medicare, never to the plan.
The middle row's upper bound is strict: it ends just below $391,000, so MAGI of exactly $391,000 belongs to the top row. That is the reverse of the standard table, where each indexed tier includes its upper bound. At least one widely read outlet publishes this table with formatting errors in the income column (checked August 2026), which is one more reason to take the boundaries from the CMS source rather than an aggregator. The full 2026 IRMAA brackets for every filing status sit on the canonical brackets page.
The reduced Part B benefit that covers only immunosuppressive drugs after a kidney transplant has its own separate-filer rows, with a $121.60 standard premium.
| MAGI | Monthly IRMAA | Total monthly premium |
|---|---|---|
| ≤ $109,000 | $0.00 | $121.60 |
| > $109,000 – < $391,000 | $445.90 | $567.50 |
| ≥ $391,000 | $486.50 | $608.10 |
Source: CMS, 2026 fact sheet (announced November 14, 2025) and Federal Register notice 90 FR 52063.
How much worse is filing separately than filing single at the same income?
Band by band, here is the same 2024 MAGI priced on both tables. Each surcharge cell adds the Part B and Part D IRMAA for the tier that income lands in.
| 2024 MAGI | Single filer pays | Separate filer (lived with spouse) pays | Separate-filer penalty per year |
|---|---|---|---|
| Over $109,000, up to and including $137,000 | $95.70 | $529.60 | $5,206.80 |
| Over $137,000, up to and including $171,000 | $240.40 | $529.60 | $3,470.40 |
| Over $171,000, up to and including $205,000 | $385.00 | $529.60 | $1,735.20 |
| Over $205,000 and under $391,000 | $529.60 | $529.60 | $0.00 |
| $391,000 or more, under $500,000 | $529.60 | $578.00 | $580.80 |
| $500,000 or more | $578.00 | $578.00 | $0.00 |
Derived from the CMS 2026 fact sheet tables. Monthly figures add each tier's Part B and Part D surcharges; the yearly penalty is the monthly difference times 12.
To check the arithmetic in the first band: the single filer owes $81.20 plus $14.50, or $95.70 a month, while the separate filer owes $446.30 plus $83.30, or $529.60. The gap is $433.90 a month, which over 12 months is $5,206.80. The same subtraction produces $3,470.40 in the second band and $1,735.20 in the third.
The penalty lands hardest exactly where retiree incomes cluster, in the band just over the first threshold. It then shrinks as income rises, and above $205,000 but under $391,000 the two tables charge an identical $529.60 a month, so in that stretch the filing status adds nothing to Medicare premiums. To price your own return on this schedule, the IRMAA calculator has a married filing separately mode that switches every threshold to this table and flags when the lived-apart rule would change the result.
Do husband and wife both pay IRMAA?
When both spouses are enrolled in Medicare and the joint income is over a threshold, yes: the surcharge attaches to each beneficiary individually, and marriage never merges the bills. What the filing status decides is which income figure sets each bill.
File jointly and one number does all the work: the MAGI on the shared return places both spouses on the standard joint table, and each spouse pays the full surcharge for that tier. In the first 2026 tier that is $81.20 plus $14.50 per spouse, two surcharges of $95.70 a month across 12 months, $2,296.80 a year for the household.
File separately and there is no shared number. Each spouse submits their own return, and SSA reads the MAGI on each spouse's own return against the three-row table above when the couple lived together during 2024. One spouse can sit under $109,000 and owe nothing while the other owes the full amount. The expensive case is both spouses on Medicare with both returns over the threshold: two surcharges of $529.60 a month across 12 months, $12,710.40 a year in combined IRMAA.
Does married filing separately avoid IRMAA?
No. There is no income at which the separate-filer table charges less than the joint or single table; matching them is the best it ever does. Take 2024 MAGI of $150,000. On the single table that lands in the second surcharge tier at $240.40 a month combined; a separate filer on the three-row table pays $529.60 at the same income. The two columns meet in the stretch above $205,000 and under $391,000, and again from $500,000 up, as the comparison table above shows.
The levers that actually lower a future surcharge are income-timing moves, covered in the guide to staying under the IRMAA thresholds. Which filing status to use is a tax decision with consequences far beyond Medicare premiums, and this page explains premium costs without weighing in on that choice.
What if we lived apart all year?
SSA applies the single-filer thresholds instead of the separate-filer table to a beneficiary who filed married filing separately and lived apart from their spouse for the entire year. Both conditions must hold. Any time under the same roof during the tax year, even briefly, means the separate table stands, and for 2026 premiums the year that matters is 2024.
The switch happens on request, not automatically. SSA's operating manual (POMS HI 01120.060) names exactly two forms of evidence: the "D" notation next to line 5a on your Form 1040, or a signed statement under penalty of perjury that you and your spouse lived apart for the entire year, together with your spouse's last known address. The request window runs from the determination notice to the end of the premium year.
At $109,001 of 2024 MAGI the correction is worth $433.90 a month. The separate-filer table charges $529.60 in combined monthly surcharges; the single table puts that income in its first tier at $95.70, which still costs $1,148.40 a year rather than zero, but not $6,355.20. Twelve months of the difference comes to $5,206.80. The wider menu of correction and appeal routes is laid out in the IRMAA appeal guide.
Should I file Form SSA-44 for this?
No. SSA-44 exists for the eight qualifying life-changing events, and living apart from your spouse is not on that list. The lived-apart correction is a filing-status fix, one species of what SSA calls a new initial determination, and the form's own Important Facts section says not to use SSA-44 for it: call SSA at 1-800-772-1213 instead. No 60-day appeal deadline attaches to it either; the window is the one above, from the notice to the end of the premium year.
That rule is narrow. A separate filer who also has a genuine life-changing event, retiring in 2026 for example, files SSA-44 like anyone else. What the form covers, event by event, is on the Form SSA-44 guide.
What were the married filing separately brackets in 2025?
| MAGI | Part B IRMAA | Total Part B premium | Part D IRMAA |
|---|---|---|---|
| ≤ $106,000 | $0.00 | $185.00 | $0.00 |
| > $106,000 – < $394,000 | $406.90 | $591.90 | $78.60 |
| ≥ $394,000 | $443.90 | $628.90 | $85.80 |
Source: CMS, 2025 fact sheet. If you lived apart from your spouse for all of 2023, SSA uses the single-filer table instead; see the married filing separately guide.
Same three-row layout, read against 2023 MAGI, with a $185.00 standard premium. The middle band, above $106,000 and under $394,000, carried $406.90 of Part B IRMAA plus $78.60 for Part D; $394,000 or more cost $443.90 and $85.80.
Setting the two published years side by side turns up an oddity: the upper breakpoint fell, from $394,000 in 2025 to $391,000 in 2026, while every other threshold on every table rose. The frozen top tier explains it. In both published years the breakpoint equals $500,000, the statutorily frozen top-tier line, minus that year's first threshold, so when the first threshold climbed from $106,000 to $109,000, the breakpoint gave back the same $3,000.
What will the 2027 separate-filer brackets be?
Only one piece can be projected today: the first threshold, which follows the published CPI formula and comes out at $112,000 in every inflation scenario. The upper breakpoint and all 2027 surcharge dollar amounts wait on the CMS announcement in fall 2026 and cannot be stated before it. The projected 2027 IRMAA brackets and their methodology are maintained on the 2027 page, updated as each CPI print lands.
Separate-filer questions people ask
Does the lived-apart correction refund months already billed?
Nothing in the published rules spells that out. The correction can be requested any time between the determination notice and the end of the premium year, and how an approved change applies to months you have already paid is a question to put to SSA when you call.
We file separately but only one of us is on Medicare. Who pays?
Only the spouse enrolled in Medicare pays Medicare premiums, IRMAA included, and the income that sets the tier is the MAGI on that spouse's own separate return. A spouse who is not enrolled has no premium to surcharge.
Where do these numbers come from?
The 2026 figures come from the CMS fact sheet announcing 2026 Medicare Parts A and B premiums (published November 14, 2025) and Federal Register notice 90 FR 52063; the 2025 figures from the CMS fact sheet of November 8, 2024; the lived-apart rule from SSA POMS HI 01120.060. Each fall's CMS announcement reaches this page within a day of publication.