IRMAA Income Calculator
Determine your potential Income-Related Monthly Adjustment Amount (IRMAA) for Medicare Part B and Part D premiums.
What is IRMAA (Income-Related Monthly Adjustment Amount)?
The Income-Related Monthly Adjustment Amount, or IRMAA, is an extra charge that some higher-income beneficiaries pay in addition to their standard Medicare Part B (Medical Insurance) and Medicare Part D (Prescription Drug Coverage) premiums. It’s important to understand what income is used to calculate IRMAA because it can significantly impact your retirement healthcare costs. The Social Security Administration (SSA) determines if you owe IRMAA based on the income you reported on your IRS tax return from two years prior.
If your income is above a certain level, you’ll pay a higher premium for Part B and a higher premium for your Part D plan. This isn’t a penalty, but rather a system designed to have higher earners contribute more to the Medicare program’s funding. Understanding the medicare irmaa brackets 2024 is the first step in planning for these potential costs.
The IRMAA Formula and Explanation
There isn’t a single mathematical “formula” for IRMAA. Instead, the Social Security Administration uses a tiered bracket system based on your Modified Adjusted Gross Income (MAGI) and tax filing status from two years ago. For example, your 2026 IRMAA is determined by your 2024 MAGI.
The core variable in this system is your MAGI. So, what income is used to calculate IRMAA? It’s your Adjusted Gross Income (AGI) from your Form 1040 plus certain tax-exempt interest income.
| Variable | Meaning | Unit / Source | Typical Range |
|---|---|---|---|
| Modified Adjusted Gross Income (MAGI) | The primary income figure used by the SSA. | USD ($), from IRS Tax Return (2 years prior) | $0 to millions |
| Tax Filing Status | Determines which set of income brackets to use. | Category (Single, Joint, Separate) | N/A |
| IRMAA Brackets | The income tiers that determine the adjustment amount. | USD ($), Set annually by SSA | Five tiers above the base premium |
For a deep dive into how MAGI is determined, see our guide on understanding MAGI for Medicare.
2024 IRMAA Monthly Adjustment Levels (Married Filing Jointly)
Practical Examples
Example 1: A Retired Couple
- Inputs:
- Tax Filing Status: Married Filing Jointly
- 2024 MAGI: $220,000
- Analysis: A MAGI of $220,000 for a couple filing jointly falls into the second IRMAA tier for 2026. Their 2024 income is what is used to calculate IRMAA for 2026.
- Results:
- Part B Adjustment: $69.90 per person
- Part D Adjustment: $12.90 per person
- Total Monthly IRMAA: $165.60 for the couple.
Example 2: A Single High-Income Earner
- Inputs:
- Tax Filing Status: Single
- 2024 MAGI: $180,000
- Analysis: A single individual with a MAGI of $180,000 falls into the fourth tier. The analysis of what income is used to calculate irmaa clearly points to this being a significant factor in their Medicare costs.
- Results:
- Part B Adjustment: $279.50
- Part D Adjustment: $51.70
- Total Monthly IRMAA: $331.20 for the individual.
How to Use This IRMAA Calculator
Our calculator simplifies determining your potential IRMAA surcharge. Follow these steps:
- Select Your Filing Status: Choose the tax filing status from your tax return two years prior (e.g., for 2026 premiums, use your 2024 tax return).
- Enter Your MAGI: Input your Modified Adjusted Gross Income from that same tax return. The helper text clarifies what this includes.
- Review Your Results: The calculator will instantly display your estimated monthly adjustments for both Part B and Part D, the total monthly IRMAA, and the income tier you fall into. This helps you see how the irmaa income limits affect you directly.
- Interpret the Output: The displayed amounts are *in addition* to the standard Part B premium and your specific Part D plan’s premium.
Key Factors That Affect IRMAA
Several types of income and specific events can influence your IRMAA determination. The central question remains: what income is used to calculate irmaa?
- Investment Gains: Large capital gains from selling stocks, bonds, or real estate will increase your MAGI.
- Roth Conversions: Converting funds from a traditional IRA or 401(k) to a Roth IRA is a taxable event and adds to your MAGI for that year.
- Pension and Annuity Payouts: Most distributions from pensions and non-qualified annuities are included in MAGI.
- Wages and Self-Employment Income: If you continue to work after enrolling in Medicare, this income is a primary component of MAGI.
- Tax-Exempt Interest: While exempt from income tax, interest from sources like municipal bonds is added back to your AGI to calculate your MAGI for IRMAA purposes.
- Life-Changing Events (LCEs): Events like marriage, divorce, death of a spouse, or retirement can be grounds for an appeal to lower your IRMAA if they cause your income to decrease. You may be interested in learning how to appeal irmaa.
Frequently Asked Questions (FAQ)
1. What year’s income is used for IRMAA?
The Social Security Administration uses your MAGI from your tax return 2 years prior. For your 2026 Medicare premiums, your 2024 MAGI is used.
2. Does Social Security income count towards IRMAA?
Yes, the taxable portion of your Social Security benefits is included in the calculation of your AGI, which is the starting point for MAGI.
3. Do withdrawals from a Roth IRA count towards IRMAA?
No, qualified distributions from a Roth IRA are tax-free and are not included in your MAGI calculation. This makes Roth accounts a powerful tool for managing future IRMAA liability.
4. Can I appeal my IRMAA determination?
Yes, you can file an appeal (Form SSA-44) if you’ve had a life-changing event that has reduced your income, such as retirement or loss of a spouse. You can also appeal if you believe the tax data used was incorrect.
5. How often do the IRMAA brackets change?
The income brackets are adjusted annually for inflation.
6. Is IRMAA charged per person or per couple?
IRMAA is always assessed on an individual basis. If a married couple files a joint return and their income exceeds the threshold, both spouses will pay a separate IRMAA surcharge on their personal Medicare premiums.
7. What is the difference between AGI and MAGI for Medicare?
For Medicare IRMAA purposes, Modified Adjusted Gross Income (MAGI) is your Adjusted Gross Income (AGI) plus any tax-exempt interest income you may have (e.g., from municipal bonds).
8. Where can I find my MAGI?
MAGI is not a specific line item on your tax return. You must calculate it by starting with your AGI (Line 11 on Form 1040) and adding back your tax-exempt interest (Line 2a on Form 1040).