Is IRMAA Per Person or Per Couple? The $12,710 Answer
A retired couple with $450,000 of joint income in 2024 will pay about $12,710 in extra Medicare premiums in 2026. Not each. Combined. That number surprises people because the answer to is IRMAA per person or per couple is genuinely both: the income that triggers the surcharge is measured on the joint return, but the bill lands on each spouse separately. One income event, two bills, every month for a full year. Here is how the doubling works and where it bites hardest.
Per person billing, joint income trigger
IRMAA is assessed on each Medicare-enrolled individual. If both spouses are on Medicare and the joint MAGI lands in a surcharge tier, each spouse pays that tier's Part B surcharge on their own premium, plus each spouse's Part D surcharge on top of their drug plan. The 2026 brackets make the doubling concrete. These are the official CMS figures, per person per month:
| 2024 MAGI, joint | Part B total | Part D add-on | Couple pays |
|---|---|---|---|
| $218,000 or less | $202.90 | $0 | Standard, no doubling |
| $218,001 to $274,000 | $284.10 | $14.50 | ~$191/mo extra combined |
| $274,001 to $342,000 | $405.80 | $37.50 | ~$481/mo extra combined |
| $342,001 to $410,000 | $527.50 | $60.40 | ~$770/mo extra combined |
| $410,001 to $749,999 | $649.20 | $83.30 | ~$1,059/mo extra combined |
At that Tier 4 row, each spouse pays $446.30 a month above the standard Part B premium. Across two spouses for twelve months, that is $10,711.20, plus $1,999.20 in Part D add-ons. The $12,710.40 total comes straight off the CMS table, before anyone has seen a doctor. This is also why the two-year lookback stings more for couples: one good income year echoes as two surcharged premiums, as I mapped in the lookback explainer.
The cliff makes the doubling worse
There is no phase-in. One dollar over a threshold buys the entire tier. A couple at $218,001 of MAGI pays the same surcharge as a couple at $274,000. Now double that cliff across two people and the cost of sloppy timing gets steep: a Roth conversion that lands $1,000 over the line can cost a couple over $1,900 a year in extra premiums, which is a return no conversion can justify.
This is the argument for managing MAGI to a buffer, not to the line. I keep a $3,000 to $5,000 cushion under the nearest threshold in my own planning, because tax documents get corrected and dividends get reclassified. The tactics for staying under are in the MAGI playbook.
The married-filing-separately trap
File separately while living with your spouse and the math turns hostile. Above $109,000 of MAGI, a separately filing spouse skips nearly every tier and lands at $649.20 a month for Part B, the second-highest tier, on the first dollar over. That is a jump of more than $5,300 a year from a single dollar of income. Couples sometimes file separately for student loan or other reasons without realizing Medicare is watching the same return.
There is one more asymmetry worth knowing. If only one spouse is on Medicare, say the younger spouse is still on employer coverage, only the enrolled spouse pays the surcharge. The joint income still sets the tier, but there is only one bill. When the second spouse enrolls, the doubling starts. Time large income events, like a business sale or a big conversion, for years when only one of you is enrolled if you can.
If income has already dropped since the lookback year, a qualifying life-changing event lets you appeal with Form SSA-44, and the appeal applies per person too. The qualifying events are covered in the SSA-44 guide.
IRMAA Per-Person FAQs
Is IRMAA charged per person or per household?
Per person. Each Medicare-enrolled individual pays the surcharge on their own Part B and Part D premiums. A married couple where both spouses are enrolled pays every tier amount twice.
Do both spouses pay IRMAA on joint income?
Yes, if both are enrolled in Medicare. The tier is set by the joint MAGI from the tax return, but the surcharge is applied to each spouse's premium separately. One income event produces two surcharged bills for the full year.
What if only one spouse is on Medicare?
Only the enrolled spouse pays the surcharge. The joint MAGI still determines which tier applies, but there is a single bill instead of two. The doubling begins when the second spouse enrolls.
Does IRMAA apply to Medicare Advantage plans?
Yes. The Part B and Part D IRMAA surcharges apply whether you have Original Medicare or a Medicare Advantage plan. I covered the details in the Medicare Advantage piece.
How much extra does a couple pay at the top IRMAA tier?
At the 2026 top tier, each person pays $689.90 a month for Part B plus a $91 Part D add-on. A couple both enrolled pays about $18,742 a year in premiums combined, versus about $4,870 at the standard rate.