What is the medicare part b premium calculator?
In short
The standard 2026 Medicare Part B premium is $202.90/month, but higher earners pay an IRMAA surcharge based on their MAGI from two years prior. A single filer with $120,000 MAGI pays $284.10/month in 2026 — an $81.20 surcharge over the base premium.
Calculates your 2026 Medicare Part B monthly premium, including any IRMAA income surcharge, based on your modified adjusted gross income and filing status.
How to use this calculator
- 1Enter your modified adjusted gross income (MAGI) from two years ago.
- 2Select your filing status (married thresholds are double the single ones).
- 3See your monthly premium, annual cost, and any IRMAA surcharge.
The formula
- base
- — Standard 2026 premium = $202.90/month
- IRMAA
- — Income surcharge based on MAGI tier
- premium
- — base + IRMAA
Worked example
The scenario
$120,000 MAGI, single filer (2026).
The result
Monthly premium: $284.10. IRMAA surcharge: $81.20. Annual cost: $3,409.20.
Common use cases
- Medicare enrollees estimating their Part B premium.
- Pre-retirees planning income to avoid crossing an IRMAA threshold.
- Understanding how a Roth conversion or capital gain could raise next year's premium.
Limitations & assumptions
- Uses 2026 premium tiers — these change annually.
- IRMAA uses MAGI from two years prior (2024 income for 2026 premiums).
- Does not include Part D IRMAA surcharges, which apply separately.
Frequently asked questions
What is the standard Medicare Part B premium for 2026?
What is IRMAA?
What income is used for IRMAA?
How can I avoid IRMAA surcharges?
Do IRMAA brackets change each year?
Disclaimer: KalkWise calculators are provided for general informational and educational purposes only and do not constitute financial, investment, tax, or legal advice. Results are estimates based on the figures you enter and the assumptions described above. Actual outcomes will vary. Consult a qualified professional before making financial decisions.