Medicare Cost Estimator (Part A / B / D + IRMAA + Supplement)
Estimate annual Medicare premiums across Part A, B, and D, including income-based IRMAA surcharges and a Medigap supplement. Educational, not financial advice. Runs in your browser.
IRMAA uses your modified AGI from 2 years prior.
2025 standard is $185.00. Verify current year.
$0 with 40+ work quarters.
Your drug plan’s base premium.
Optional supplemental policy.
IRMAA (income-related monthly adjustment amount) adds a surcharge to Part B and Part D once income passes the tiers, based on your MAGI from two years earlier. The premiums and IRMAA tiers shown use 2025 figures (the most recent published) and change annually — verify current amounts at Medicare.gov / SSA. Part A is premium-free for most people with 40+ quarters of Medicare-covered work. This excludes deductibles, coinsurance, and out-of-pocket care costs. Not financial advice — consult a professional. Everything runs in your browser.
About this tool
Medicare is not a single premium but a stack of parts, and higher earners pay surcharges on top — so the true annual cost varies widely by income. This estimator adds up the monthly premiums and annualizes them. Part A (hospital insurance) is premium-free for most people who have at least 40 quarters (roughly ten years) of Medicare-covered work, so its premium defaults to zero. Part B (medical insurance) has a standard premium that everyone pays — $185.00 per month in 2025 — and Part D (prescription drug coverage) has a plan premium that varies by the plan you choose. The wrinkle for higher-income beneficiaries is IRMAA, the income-related monthly adjustment amount: once your modified adjusted gross income (MAGI) from two years prior crosses a series of thresholds, Medicare adds a surcharge to both your Part B and Part D premiums, rising through several tiers up to a maximum at the highest incomes. Because IRMAA looks back two years, a one-time income spike (selling a house or a large Roth conversion) can raise your premiums later — useful to plan around. This tool lets you pick single or married-filing-jointly thresholds, enter your MAGI, and see the resulting surcharge and total. The premium and IRMAA figures it uses are 2025 amounts, the most recent published, and they change every year, so they are editable and should be verified against Medicare.gov or SSA for the year you need. The estimate covers premiums only — it excludes deductibles, coinsurance, copays, and the actual cost of care, which can add substantially to real out-of-pocket spending. It is educational and not financial advice — consult a professional. Everything runs in your browser; nothing is uploaded.
How to use it
- Choose single or married-filing-jointly.
- Enter your MAGI from two years ago (IRMAA's lookback period).
- Confirm the Part B base premium and your Part D plan premium (verify current-year figures).
- Add a Medigap/supplement premium if you have one.
- Read the estimated monthly and annual cost, including any IRMAA surcharge.
Frequently asked questions
- What is IRMAA?
- The income-related monthly adjustment amount is a surcharge added to Part B and Part D premiums for higher-income beneficiaries. It is based on your modified adjusted gross income (MAGI) from two years earlier and rises through several income tiers.
- How much is the standard Part B premium?
- The 2025 standard Part B premium is $185.00 per month; higher earners pay more via IRMAA. Premiums change yearly, so verify the current figure — this tool lets you edit it.
- Why does Medicare use my income from two years ago?
- IRMAA is based on the most recent tax return available to SSA, which is typically two years old. This means a one-time income event — like a large Roth conversion or home sale — can raise your premiums two years later.
- Is Part A really free?
- For most people with 40+ quarters of Medicare-covered employment, Part A has no premium. Those with fewer quarters pay a monthly Part A premium, which you can enter in the tool.
- Does this include deductibles and out-of-pocket costs?
- No. It estimates premiums only (Parts A, B, D, IRMAA, and a supplement). Deductibles, coinsurance, copays, and the cost of actual care are extra and can be significant.
- Is this financial advice?
- No. It is an educational estimate using the most recent published figures, which change annually. Verify with Medicare.gov or SSA and consult a professional. Nothing is uploaded.