Medicare Monthly Cost Calculator
Estimate how much Medicare costs per month based on your income, filing status, and plan choices. Numbers reflect 2026 premium schedules and adjust automatically with your inputs.
Wondering how much Medicare costs per month? Most beneficiaries pay the standard 2026 Part B premium of about $185, but high earners face Income-Related Monthly Adjustment Amounts (IRMAA) that can push the bill above $628. Add Part D drug coverage (averaging $46/month in 2026), an optional Medigap supplement ($120–$220), or a Medicare Advantage plan ($0–$80), and total monthly outlays range from roughly $185 for a basic enrollee to over $900 for a high-income couple with full supplemental coverage. This calculator estimates your personalized monthly and annual cost.
Your premium depends on the Modified Adjusted Gross Income (MAGI) on your tax return from two years prior — so 2026 premiums use 2024 MAGI. A single filer with MAGI under $106,000 (or a joint filer under $212,000) pays the standard rate; above those thresholds, IRMAA brackets add $74 to $443 per month to Part B alone. Plan choices matter too: a $0-premium Medicare Advantage plan can replace a $180 Medigap policy but adds copays. Below, enter your details to see a realistic monthly Medicare cost estimate.
How it works: Enter your MAGI from two years ago, your filing status, and which parts of Medicare you intend to enroll in. The calculator applies the 2026 IRMAA brackets to Parts B and D, adds your chosen supplemental coverage, and returns both monthly and annual totals.
This calculator estimates premiums only — it does not constitute medical, tax, or insurance advice. Actual costs depend on your specific plan, state, and utilization. Consult Medicare.gov's Plan Finder or a licensed SHIP counselor before enrolling. Do not delay Part B enrollment past age 65 unless you have qualifying creditable employer coverage (generally 20+ employee group plans). The late-enrollment penalty is 10% of the standard premium for every full 12-month period you were eligible but didn't enroll — and it lasts for life. A 3-year delay with no creditable coverage adds roughly $55.50/month in 2026 dollars, permanently. If you face IRMAA surcharges exceeding $74/month and have had a life-changing event (retirement, divorce, work stoppage, death of spouse), file SSA Form SSA-44 within 60 days of your initial determination. Missing this window can cost $1,000–$5,000+/year in avoidable surcharges.
Understanding Your 2026 Medicare Monthly Cost
Medicare's monthly cost is rarely a single number — it's a stack of premiums, surcharges, and supplemental choices that vary by income and risk tolerance. This guide breaks down each layer with the 2026 rates so you can plan accurately.
2026 Part B Premium by Income (IRMAA brackets)
| Single MAGI (2024) | Joint MAGI (2024) | Monthly Part B Premium | Part D Surcharge |
|---|---|---|---|
| ≤ $106,000 | ≤ $212,000 | $185.00 | $0.00 |
| $106,001–$133,000 | $212,001–$266,000 | $259.00 | $13.70 |
| $133,001–$167,000 | $266,001–$334,000 | $370.00 | $35.30 |
| $167,001–$200,000 | $334,001–$400,000 | $480.90 | $57.00 |
| $200,001–$500,000 | $400,001–$750,000 | $591.90 | $78.60 |
| > $500,000 | > $750,000 | $628.90 | $85.80 |
Supplemental Coverage Comparison (2026 national averages)
| Option | Monthly Premium | Annual Deductible | Network Restrictions | Best For |
|---|---|---|---|---|
| Original Medicare only | $0 | $257 (Part B) | None | Short-term gap coverage |
| Medicare Advantage ($0) | $0 | $0–$500 | HMO/PPO networks | Healthy retirees on a budget |
| Medicare Advantage (premium) | $40–$80 | $0–$300 | PPO networks | Want dental/vision included |
| Medigap Plan N | $120–$160 | $257 | Any Medicare provider | Moderate users, copay-tolerant |
| Medigap Plan G | $160–$220 | $257 | Any Medicare provider | Want predictable costs nationwide |
| Medigap Plan G + Part D | $200–$270 | $257 + drug deductible | Any provider | Comprehensive lifelong coverage |
What Does Medicare Actually Cost in 2026?
For roughly 93% of beneficiaries, the headline Medicare cost is the standard 2026 Part B premium of $185.00/month. Add the average Part D drug plan ($46/month) and a typical Medigap Plan G ($180/month), and the all-in monthly premium reaches about $411. Original Medicare's Part A is premium-free for anyone with 40+ quarters of payroll-tax history. The remaining 7% — high earners — pay IRMAA surcharges that can push Part B alone above $628/month. Couples filing jointly with MAGI over $750,000 face roughly $9,000/year in IRMAA alone, on top of base premiums.
Why Is My Premium Based on Income From Two Years Ago?
Medicare uses the most recent fully-filed tax return, which for 2026 premiums means your 2024 return. The Social Security Administration receives this data from the IRS each fall and notifies affected beneficiaries by November of the prior year. If your income has dropped since 2024 due to a 'life-changing event' (retirement, divorce, death of spouse, loss of pension), you can file Form SSA-44 to request an IRMAA reduction based on current income. This is a common, under-used appeal — denials of the initial determination are reversed roughly 70% of the time when proper documentation is provided.
How Much Does Each Calculator Input Actually Move the Number?
Income is the single biggest lever above the $106k/$212k threshold — crossing into the next IRMAA bracket adds $74–$111/month instantly. Below the threshold, income doesn't matter at all. Supplemental choice is the next biggest factor: switching from a $0 Advantage plan to Medigap Plan G adds $180/month ($2,160/year). Part D tier swings the bill by $50/month between basic and enhanced. The chronic-condition input doesn't change your premium — it only adjusts the realistic annual out-of-pocket overlay shown in insights, because Medicare's deductibles and 20% coinsurance compound with utilization.
Medigap vs. Medicare Advantage: The $180 Question
Medigap (Medicare Supplement) and Medicare Advantage are mutually exclusive — you cannot hold both. Medigap Plan G pays your 20% Part B coinsurance and most copays, leaving you to cover only the annual $257 Part B deductible; premiums run $160–$220/month nationally. Medicare Advantage replaces Original Medicare with a private HMO/PPO, often at $0 premium, but caps annual out-of-pocket at $9,350 (2026 max) and restricts you to in-network providers. Rule of thumb: if you travel frequently, see specialists out-of-state, or expect heavy medical use after age 75, Medigap usually wins; otherwise $0 Advantage saves $2,000+/year.
Common Mistakes That Inflate Your Monthly Cost
First, delaying Part B without qualifying employer coverage triggers a 10%-per-year permanent penalty — a 3-year delay means 30% higher premiums for life. Second, skipping Part D 'because I take no drugs' incurs a 1%-per-month penalty if you enroll later, often adding $8–$20/month forever. Third, missing the 6-month Medigap open enrollment window (starts the month your Part B begins) means insurers can medically underwrite you and charge up to 3× more — or deny coverage entirely. Fourth, ignoring the IRMAA appeal process after retirement leaves thousands on the table.
How to Lower Your Medicare Premium Legally
If your MAGI is near a bracket cliff, Roth conversions in low-income years before 65 reduce future Required Minimum Distributions that would otherwise spike IRMAA. Qualified Charitable Distributions (QCDs) from IRAs after age 70½ count toward RMDs but don't appear in MAGI — a powerful tool to stay under the $106k/$212k threshold. Health Savings Account (HSA) withdrawals for qualified medical expenses are also MAGI-neutral. Finally, if you have a 'life-changing event' that drops income, file Form SSA-44 within 60 days for an immediate premium recalculation.
When to Re-Check Your Medicare Costs
Medicare's Open Enrollment runs October 15–December 7 each year for changes effective January 1. Re-run the numbers annually because: (1) the standard Part B premium changes each year (it rose from $164.90 in 2023 to $185.00 in 2026), (2) IRMAA brackets are indexed to inflation, (3) Part D formularies shift drugs between tiers, and (4) Medicare Advantage plans renegotiate networks. A 15-minute annual review during open enrollment averages $300–$700/year in savings according to KFF analysis of plan-switching outcomes.
How This Calculator Works: Methodology & Parameter Explanations
Core formula:
Monthly_Cost = Part_A (0) + (Part_B_Standard + IRMAA_B) + (Part_D_Base + IRMAA_D) + Supplemental_Premiumwhere:
Part_B_Standard— Standard 2026 Part B premium ($/month)IRMAA_B— Income-Related Surcharge on Part B (bracket lookup on MAGI) ($/month)Part_D_Base— Plan-tier base Part D premium ($/month)IRMAA_D— Income-Related Surcharge on Part D ($/month)Supplemental_Premium— Medigap or Medicare Advantage premium ($/month)MAGI— Modified Adjusted Gross Income (tax year minus 2) ($/year)
How to apply: Multiply the monthly result by 12 for the annual premium. To estimate true total healthcare spend, add expected out-of-pocket costs (deductibles, copays, coinsurance) — the calculator overlays a range based on your chronic-condition input.
Worked example: A married couple filing jointly with $240,000 MAGI sits in the first IRMAA tier ($212k–$266k joint), adding $74 to each spouse's Part B and $13.70 to Part D. Each spouse's monthly cost = $0 (Part A) + $259 (Part B with IRMAA) + $59.70 (avg Part D with IRMAA) + $180 (Medigap G) = $498.70/month, or $5,984/year per person — $11,968/year for the couple before any out-of-pocket spending.
Alternative formulas
Hold-harmless calculation: Part_B_actual = min(Part_B_Standard, prior_year_Part_B + SS_COLA_dollar_increase)
When to use: Applies only to enrollees whose Part B is deducted from their Social Security check and whose COLA increase is smaller than the premium increase. Doesn't apply to high-income IRMAA payers or new enrollees.
Late-enrollment penalty model: Part_B_with_penalty = Part_B × (1 + 0.10 × full_years_delayed)
When to use: Use when modeling the lifelong cost of delaying Part B enrollment without qualifying creditable coverage.
Parameter explanations
| Input | Unit | What it means | Impact on results |
|---|---|---|---|
| Modified Adjusted Gross Income | $ | Your AGI from line 11 of Form 1040 plus tax-exempt interest, from the tax year two years prior to the premium year. | Below the $106k/$212k threshold, MAGI has zero effect. Above it, each bracket crossing adds $74–$111/month to Part B plus $13.70–$22.30 to Part D. |
| Tax Filing Status | — | How you file federal income tax — single, jointly with a spouse, or separately. | Joint filers get roughly 2× the MAGI threshold of singles. Married-filing-separately uses much steeper, compressed brackets — a tax penalty of up to $443/month above $106k. |
| Part B Enrollment | — | Whether you have enrolled in outpatient/medical Medicare or delayed it. | Standard enrollment adds the full Part B premium (plus IRMAA). Delaying with qualifying employer coverage costs $0 now but risks a 10%/year permanent late penalty if not qualifying. |
| Part D Drug Plan Tier | $/mo | Which level of stand-alone prescription drug plan you select. | Swings premiums by $0–$75/month base, plus $0–$85.80/month in IRMAA. Skipping Part D entirely saves $46/month average today but risks ~$5–$15/month in lifelong penalties. |
| Supplemental Coverage | $/mo | Your choice between no extra coverage, Medicare Advantage (replaces Original Medicare), or Medigap (supplements it). | Single largest controllable lever: ranges from $0 to $220/month. Trades premium dollars for out-of-pocket exposure caps. |
| Chronic Condition Load | — | Approximate count of conditions requiring ongoing management (diabetes, hypertension, COPD, etc.). | Does NOT change premium. Drives the realistic out-of-pocket overlay shown in insights, ranging from $300/year (healthy) to $9,000+/year (high utilization). |
Assumptions
Part A is premium-free, assuming 40+ quarters of Medicare payroll-tax contributions (true for ~99% of U.S. retirees).
IRMAA brackets reflect 2026 published thresholds — CMS finalizes brackets each November for the following year. The thresholds shown ($106k single / $212k joint) and surcharges ($74–$443/month on Part B) match the 2026 release.
MAGI is treated as your 2024 tax-year figure — Medicare uses the most recently filed return from two years prior. If you've had a 'life-changing event' since then, file SSA-44 to use current income — the calculator does not model this appeal.
Supplemental premiums are national averages — Actual Medigap and Advantage premiums vary by ZIP code, age (in some states), and tobacco status. Use a state-specific quote for precision; expect ±30% variance from the defaults shown.
Any specific income figure in our example content (e.g., $75,000 default) is illustrative only — the calculator works across the full MAGI spectrum.
How to use this calculator
- Pull your 2024 tax return — Look at line 11 of Form 1040 and add any tax-exempt interest (line 2a). That sum is your MAGI for 2026 Medicare purposes.
- Set filing status and coverage choices — Pick your tax filing status, then choose Part B enrollment status, Part D tier, and supplemental coverage based on your risk tolerance and travel patterns.
- Add your chronic condition load — Be realistic — counting only conditions actively requiring prescriptions or specialist visits. This refines the all-in cost estimate beyond premiums.
- Compare against alternatives — Re-run with a different supplemental choice (e.g., $0 Advantage vs. Medigap G) to see the lifetime cost-of-coverage trade-off.
- Revisit each fall during Open Enrollment — Premiums, IRMAA thresholds, and plan formularies update annually. Re-run between October 15 and December 7 to lock in next year's plan.