Medicare Premium Calculator
Estimate your Medicare Part B and Part D premiums for 2026 — including IRMAA surcharges for higher-income beneficiaries.
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How to use this calculator
- 1
Enter the MAGI you want the surcharge tiers tested against. The tool uses exactly the figure you type; it does not look up a tax year or work out MAGI from other numbers.
- 2
Choose Single / Head of household, Married Filing Jointly, or Married Filing Separately (lived with spouse). Separate filers who lived with a spouse have their own, narrower thresholds in this tool; separate filers who lived apart from their spouse all year should pick Single.
- 3
Choose Part B only, Part D only, or both. Lines for a part you did not select show Not included.
- 4
IRMAA is the income-related surcharge. In this tool it raises Part B to a tiered premium and adds a tiered amount to a flat Part D base.
Frequently asked questions
How does this tool pick your IRMAA tier?
This tool uses a six-row table labelled 2026 and picks the first row whose MAGI ceiling is at or above the figure you enter. A MAGI exactly equal to a ceiling stays in the lower tier, and one dollar above moves you up, except at the top: the highest tier begins at $500,000 for single filers, $750,000 for joint filers and $391,000 for separate filers, so a MAGI exactly at that figure is already in the top tier. The tier sets the monthly Part B premium and the Part D surcharge, and the result lines show the Part B surcharge, the Part D surcharge and a tier label.
Which premium amounts are built in?
Part B is $202.90 at the standard level and then $284.10, $405.80, $527.50, $649.20 and $689.90 across the higher tiers. The Part D surcharges are $0, $14.50, $37.50, $60.40, $83.30 and $91.00. Part D also has a flat base of $38.99, the 2026 national base beneficiary premium. All of these are fixed values labelled 2026. The tier thresholds are tested against income from two years earlier (2024 for 2026 premiums), so enter the MAGI the Social Security Administration would use.
Is the Part D figure a real plan premium?
No. Part D premiums depend on the plan you choose and where you live. The tool uses one flat base and adds the income surcharge on top, so the Part D line is an illustration of the surcharge effect and not a quote. Check plan prices through Medicare.gov.
Which MAGI should I enter, and which year?
Enter the modified adjusted gross income that the Social Security Administration would use, which is generally taken from an earlier tax return. The tool does not know which year you mean and does not add back tax-exempt interest or other items, so you must supply the final MAGI figure.
How are the filing statuses handled?
Three choices exist: Single / Head of household, Married Filing Jointly, and Married Filing Separately (lived with spouse). Separate filers who lived with a spouse have only three outcomes in this tool: the standard level up to $109,000, the fifth row from $109,001 to just under $391,000, and the top row from $391,000. Separate filers who lived apart from a spouse for the whole year should choose Single, which is how the thresholds are generally applied to them. Check the Social Security Administration for your own situation.
What is not in the total?
Part A, deductibles and coinsurance, Medigap or Medicare Advantage premiums, late-enrollment penalties, and any Part B premium reductions or hold-harmless protections are not modelled. The total is only the sum of the Part B and Part D lines you select.
Are the figures current?
The figures built into this tool are labelled 2026 and are not updated automatically. US Medicare premiums and IRMAA thresholds are reset every year by CMS and the Social Security Administration, which govern, so use the tool to see how tiers work and rely on those agencies, or a qualified adviser, for the current amounts.
Medicare premiums and income-related surcharges (IRMAA)
How the tier lookup works
The tool holds one table with six rows. Each row has a MAGI ceiling for single filers, a higher ceiling for married couples filing jointly, a Part B monthly premium and a Part D surcharge. It looks for the first row whose ceiling is at or above your MAGI and applies that row. The first row is the standard level with no surcharge. The final row has no ceiling and applies to everyone above the fifth ceiling. The monthly total adds the selected parts: Part B alone, Part D alone (a flat $38.99 base plus the surcharge) or both. Annual premium is twelve times the monthly figure.
The table built into the tool
These are the rows the tool searches, labelled 2026 in its code. Note how the ceilings for joint filers are exactly double the single ones in the first four rows, while the fifth row is $500,000 for single and $750,000 for joint, and that the Part D column is only the surcharge, not the whole premium. Separate filers who lived with a spouse skip rows 1 to 3: from $109,001 they use row 4, and from $391,000 row 5. The last row starts at, not above, its ceiling.
| Tier | Single MAGI up to | Joint MAGI up to | Part B monthly | Part D surcharge |
|---|---|---|---|---|
| 0 (standard) | $109,000 | $218,000 | $202.90 | $0.00 |
| 1 | $137,000 | $274,000 | $284.10 | $14.50 |
| 2 | $171,000 | $342,000 | $405.80 | $37.50 |
| 3 | $205,000 | $410,000 | $527.50 | $60.40 |
| 4 | Below $500,000 | Below $750,000 | $649.20 | $83.30 |
| 5 | $500,000 and above | $750,000 and above | $689.90 | $91.00 |
Worked examples
A single filer with $100,000 of MAGI choosing both parts sees $241.89 a month, which is $202.90 for Part B plus the $38.99 Part D base, or $2,903 a year. At $120,000 the same person lands in tier 1: Part B becomes $284.10, Part D becomes $53.49, and the total is $337.59 a month or $4,051 a year. A married couple filing jointly at $300,000 reaches tier 2, with Part B at $405.80, Part D at $76.49, $482.29 monthly and $5,787 annually. A single filer with $600,000 choosing only Part B pays $689.90 a month, or $8,279 a year. A separate filer who lived with a spouse and has $200,000 of MAGI goes straight to tier 4: $649.20 for Part B, $122.29 for Part D, $771.49 a month.
The one-dollar edges
Because each tier begins the dollar after the previous ceiling, the tool shows a jump rather than a gradual slope. With Part B only, a MAGI of $109,000 gives $202.90 a month while $109,001 gives $284.10, which is $3,409 a year. Likewise $137,000 gives $284.10 and $137,001 gives $405.80. Testing figures just either side of a ceiling is a quick way to see how much a small change in MAGI would move the premium under this table.
What the monthly total does not include
The estimate covers only Part B and a flat Part D illustration. It leaves out Part A, deductibles, copayments, Medigap or Advantage premiums, penalties for late enrolment and any appeal or life-changing-event adjustment. The tool also takes MAGI as given, so it does not tell you which year of income applies or what counts toward MAGI. Because premiums and thresholds are reset every year and the table here is fixed at its 2026 label, US figures change every year and are not updated automatically here, and the official Medicare figures and the Social Security Administration decide what you actually pay.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →