Medicare Supplement Cost Calculator
Estimates your total annual Medicare costs including Part B premiums, Medigap plan premiums, Part D drug coverage, and expected out-of-pocket expenses. Ideal for beneficiaries comparing supplement plans during open enrollment.
Last updated: September 2026
Formula below · 2 sources (medicare.gov, Wikipedia) · Updated Sep 2026
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About this calculator
Medicare costs have several layers, all shown here with 2026 figures. Part B: the standard premium is $202.90/month. Higher earners pay more through the Income-Related Monthly Adjustment Amount (IRMAA), based on modified AGI from two years earlier (2024 income for 2026). For a single filer the total Part B premium is $284.10 above $109,000, $405.80 above $137,000, $527.50 above $171,000, $649.20 above $205,000 and $689.90 at $500,000 or more, and the same tiers add $14.50, $37.50, $60.40, $83.30 or $91.00 a month to your Part D premium (married couples filing jointly use double the thresholds, to $750,000 for the top tier). Medigap: the plan selector uses illustrative typical premiums for a 65-year-old (Plan F $180, Plan G $150, Plan N $120, Plan A $100 a month), scaled by the geographic factor; enter your actual quote to override them, since Medigap prices vary widely by state, age and insurer. Part D: enter your plan's premium. Out-of-pocket costs: a rough annual estimate by health status — excellent $500, good $1,200, fair $2,500, poor $4,000 — which does not change with the Medigap plan chosen. Total Annual Cost = (Part B + Part D IRMAA + Medigap + Part D premium) × 12 + out-of-pocket. Part A is premium-free for most people with 40 quarters of work.
How to use
Example: Annual income $120,000 (single), Plan G Medigap at the typical premium, $35/month Part D, good health, geographic factor 1.05. Step 1 — Part B with IRMAA: income above $109,000 puts you in the first tier, $284.10/month, plus a $14.50 Part D surcharge. Step 2 — Medigap: $150 × 1.05 = $157.50/month. Step 3 — Monthly premiums: $284.10 + $14.50 + $157.50 + $35 = $491.10, or $5,893.20 a year. Step 4 — Add out-of-pocket for good health: $1,200. Step 5 — Total annual cost: $7,093.20. Adjust your income, plan, and health status to compare scenarios.
Frequently asked questions
What is the difference between Medicare Plan G and Plan F for supplement coverage?
Plan F is the most comprehensive Medigap policy, covering the Part B deductible in addition to everything Plan G covers — but it is only available to beneficiaries who turned 65 before January 1, 2020. Plan G covers nearly the same benefits except the Part B deductible ($283 in 2026), making it the top option for new enrollees. Because Plan G premiums are typically lower than Plan F, many beneficiaries save money overall even after paying the deductible out of pocket. This calculator lets you compare both plans side by side by switching the Medigap plan selector.
How does income affect Medicare Part B premiums through IRMAA?
The Income-Related Monthly Adjustment Amount (IRMAA) is a surcharge added to the standard Part B premium, and to Part D, for higher earners. For 2026 it starts when modified AGI from two years earlier (your 2024 return) exceeds $109,000 for individuals or $218,000 for married couples filing jointly. It rises in five tiers: the total Part B premium goes from the standard $202.90 to $284.10, $405.80, $527.50, $649.20 and finally $689.90 a month at $500,000 or more ($750,000 joint), with Part D surcharges from $14.50 to $91.00 a month. Because the tiers are cliffs, $1 of extra income can cost hundreds of dollars a year; you can appeal with Form SSA-44 after a life-changing event such as retirement.
Why does geographic location affect Medicare supplement insurance costs?
Medigap insurers are allowed to set their own premiums, and pricing varies significantly by state and county due to differences in healthcare provider costs, state insurance regulations, and local competition. A plan that costs $150/month in a rural Midwest state might cost $200/month or more in a high-cost urban area. The geographic cost multiplier in this calculator (e.g., 1.0 for average, 1.2 for high-cost areas) scales your total premium estimate to reflect regional variation. For precise quotes, contact insurers licensed in your state or use the Medicare Plan Finder tool.