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For 2027, the maximum Part D deductible is $700 and the annual out-of-pocket threshold for covered Part D drugs is $2,400. Premiums and non-covered drugs do not count toward this threshold. The $41.33 base beneficiary premium is used in the late-enrollment penalty formula; it is not the premium every plan charges.
Annual Open Enrollment runs October 15–December 7, 2026 for coverage starting January 1, 2027. Medicare Advantage Open Enrollment runs January 1–March 31, 2027 for people already enrolled in Medicare Advantage.
Still pending as of this review: 2027 Part A and Part B premiums and deductibles and Part B/Part D IRMAA amounts. Any 2026 amounts on this page remain labeled as 2026 comparisons, not 2027 amounts.
Negotiated prices for 15 additional Part D drugs take effect January 1, 2027. The voluntary Medicare Prescription Payment Plan spreads covered out-of-pocket drug costs across the calendar year; it does not reduce the total cost.
Calculator year: 2026. The calculations use published 2026 premiums and IRMAA brackets, not 2027 estimates. SSA generally uses your 2025 tax return for 2027 IRMAA.
Sources: CMS 2027 Rate Announcement; CMS Part D base premium announcement; Medicare.gov enrollment guidance; CMS negotiated drug prices; Medicare Prescription Payment Plan.
Direct answer: For 2026, CMS sets the standard Medicare Part B premium at $202.90/month with a $283 annual deductible. Higher-income beneficiaries pay an IRMAA surcharge based on their 2024 modified adjusted gross income (MAGI): single filers above $109,000 (or joint filers above $218,000) pay $284.10 to $689.90/month for Part B, plus a Part D surcharge of $14.50 to $91/month. This calculator matches your income and filing status against the official 2026 IRMAA brackets.
Monthly Part B premium by 2024 MAGI:
The calculator uses a two-year lookback: your 2026 premiums are based on your 2024 tax return's MAGI, matched to the 2026 brackets published by the Centers for Medicare & Medicaid Services (CMS). IRMAA (Income-Related Monthly Adjustment Amount) is the surcharge added to Part B and Part D for higher incomes. One strategy to reduce future IRMAA: Qualified Charitable Distributions (QCDs) of up to $111,000 in 2026 (age 70½+) lower MAGI, per IRS annual inflation adjustments. Results are educational estimates, not a benefits determination.
Primary sources: CMS premium announcements • Medicare.gov cost overview • IRS Notice 2025-67 (QCD limit)
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