Medicare Part D Premium Calculator

The Social Security Administration uses your MAGI from your 2024 tax return to determine your 2026 Part D IRMAA. The table below shows the projected income brackets and corresponding monthly surcharges. If your income is at or below the first threshold for your filing status, you pay no IRMAA—only your plan's standard premium.

Note: These 2026 figures are projections based on 2024 official numbers and estimated inflation adjustments. Official amounts are typically released in late 2025.

The Income-Related Monthly Adjustment Amount (IRMAA) is an extra charge that high-income beneficiaries pay for Medicare Part B (Medical Insurance) and Medicare Part D (Prescription Drug Coverage). It's not a penalty, but rather a system designed so that those with greater financial resources contribute more to the program's funding.

The key things to understand about IRMAA are:

1. The Two-Year Lookback: Your IRMAA is always determined by your income from two years ago. For your 2026 premiums, the IRS sends your 2024 tax return data to the Social Security Administration. This lookback can be a major issue for new retirees whose income drops significantly after they stop working.

2. It's Based on MAGI: The income figure used isn't your salary or your Adjusted Gross Income (AGI). It's your Modified Adjusted Gross Income, which for most people is their AGI plus any tax-exempt interest they received (e.g., from municipal bonds).

3. It's Added to Your Premium: The IRMAA surcharge is paid in addition to your regular Part D plan premium. For example, if your chosen drug plan has a $50/month premium and your income requires a $35.30/month IRMAA, your total monthly cost will be $85.30.

Large, one-time income events can unexpectedly push you into a higher IRMAA bracket. This includes capital gains from selling property, a large bonus, or a significant Roth conversion. Because of the two-year lookback, the income you generate in your final working years can directly impact your healthcare costs in your first few years of retirement. Planning for these income spikes is a critical part of managing your overall retirement healthcare costs.

Since your Part D IRMAA is tied directly to your MAGI, lowering your MAGI is the only way to reduce or eliminate the surcharge. This requires proactive tax planning, ideally years before you enroll in Medicare. Thoughtful income management not only lowers your premiums but can also determine how long your money will last in retirement.

Consider these strategies to manage your income:

• Time Your Roth Conversions: Converting a traditional IRA or 401(k) to a Roth account creates taxable income. It's best to complete large conversions several years before you turn 63, so the income spike doesn't affect your Medicare premiums at age 65.
• Use Qualified Charitable Distributions (QCDs): If you are over age 70½, you can donate up to $105,000 (for 2026) directly from your IRA to a qualified charity. A QCD satisfies all or part of your Required Minimum Distribution (RMD) but isn't included in your AGI, effectively lowering your MAGI. This is one of the best ways to reduce taxes on RMDs.
• Strategize Your Withdrawals: Once in retirement, you can control your income by choosing which accounts to draw from. Taking funds from a Roth IRA generates no taxable income and won't increase your MAGI. A carefully planned retirement withdrawal strategy can keep you under an IRMAA threshold.
• Harvest Tax Losses: In non-retirement brokerage accounts, you can sell investments at a loss to offset capital gains. You can deduct up to $3,000 in net capital losses against your ordinary income each year, directly reducing your MAGI.
• Contribute to an HSA: If you are still working and have a high-deductible health plan, contributing to a Health Savings Account (HSA) provides an above-the-line deduction that lowers your AGI and, therefore, your MAGI.

The calculator determines your total monthly cost by adding your plan's premium to the specific IRMAA surcharge dictated by your income and filing status.

The primary formula is:

Total Monthly Premium = Part D Plan Premium + Monthly IRMAA Surcharge

Where:

• Part D Plan Premium = The standard monthly premium charged by your specific prescription drug insurance provider.
• Monthly IRMAA Surcharge = The extra amount you must pay based on your MAGI from two years prior. This is determined by a lookup in the official IRMAA income tables.

To find your total annual cost, the calculator uses this formula:

Total Annual Premium = Total Monthly Premium × 12

The most complex part of the calculation is identifying the correct Monthly IRMAA Surcharge. The calculator does this by:

1. Selecting the correct income bracket table based on your tax filing status (Single, Joint, or Married Filing Separately).
2. Comparing your Modified Adjusted Gross Income (MAGI) to the thresholds in that table.
3. Assigning the corresponding monthly surcharge for the income tier you fall into.

If your income has decreased significantly since your 2024 tax return due to a specific life-changing event, you don't have to wait two years for your premiums to adjust. You can request a new decision from the Social Security Administration (SSA) by filing Form SSA-44, "Medicare Income-Related Monthly Adjustment Amount - Life-Changing Event."

The SSA recognizes the following as qualifying life-changing events:

• Marriage
• Divorce or annulment
• Death of a spouse
• Work stoppage (you or your spouse stopped working)
• Work reduction (you or your spouse reduced your hours)
• Loss of income-producing property (due to disaster or other event beyond your control)
• Loss of pension income (due to termination or reorganization of the pension plan)
• Employer settlement payment (you or your spouse received a settlement from an employer due to closure, bankruptcy, or reorganization)

If your appeal is approved, the SSA will recalculate your IRMAA based on your more recent, lower income, potentially saving you hundreds or thousands of dollars per year. This is a crucial step for anyone who retires and sees a large income drop right before starting Medicare.

What is the difference between the Part D premium and Part D IRMAA?

The Part D premium is the base monthly cost you pay to a private insurance company for your specific prescription drug plan. The Part D IRMAA is an additional surcharge paid directly to Social Security by higher-income individuals, on top of their plan premium.

Who has to pay the Medicare Part D IRMAA in 2026?

You will have to pay the Part D IRMAA in 2026 if your 2024 MAGI was above $110,000 for an individual filer or above $220,000 for a couple filing a joint tax return. The amount of the surcharge increases as your income rises through several tiers.

Is the Part D IRMAA the same as the Part B IRMAA?

No, they are two separate surcharges, although they are calculated using the same MAGI thresholds and two-year lookback period. If your income is high enough to trigger IRMAA, you will pay one surcharge for Part B and another, separate surcharge for Part D.

How is the Part D IRMAA paid? Is it tax-deductible?

If you receive Social Security benefits, the IRMAA is typically deducted directly from your monthly payment. If not, you will be billed quarterly by Medicare. The IRS allows you to deduct all premiums for Medicare insurance, including IRMAA surcharges, as a medical expense if you itemize deductions and your total medical expenses exceed 7.5% of your AGI.

Does a large IRA withdrawal or Roth conversion trigger IRMAA?

Yes, absolutely. A large withdrawal from a traditional IRA or a Roth conversion is treated as ordinary income, which increases your AGI and MAGI. A single large conversion can easily push you into the highest IRMAA brackets for two full years, making proactive tax planning essential to finding your ideal retirement number.

Can I avoid Part D IRMAA by choosing a specific plan?

No. Your Part D plan choice has no effect on whether you owe IRMAA. The surcharge is determined solely by your income and is applied on top of whatever plan premium you pay, whether your plan costs $10/month or $100/month.

What happens if I get married or divorced? How does that affect my IRMAA?

Marriage and divorce are considered life-changing events by the Social Security Administration. If your marital status changes and it causes your income to drop into a lower IRMAA bracket, you can file an appeal (Form SSA-44) to have your premium recalculated based on your new household income.

Now that you understand how your income affects your Medicare Part D costs, you can plan more effectively. Use this knowledge to inform your withdrawal strategy and tax planning for the years leading up to and during retirement.

Explore these related tools to build a more complete picture of your retirement finances:

1. Retirement Healthcare Cost Calculator: Estimate your total medical spending in retirement, including premiums, co-pays, and out-of-pocket costs.
2. Safe Withdrawal Rate Calculator: Determine a sustainable withdrawal strategy that accounts for expenses like IRMAA.
3. Federal Retirement Calculator: Plan for your federal benefits and how they interact with Medicare and other retirement income sources.

Last updated: July 2026