Understanding your part B premium: Income can change what you pay

As you navigate Medicare, understanding the different parts and what they cost is key to managing your healthcare. Most people are familiar with the standard Part B premium, which covers doctor visits, outpatient care, and many preventive services. However, it's a common misconception that everyone pays the same amount. The truth is, your income can directly affect your Part B premium.

What is the income-related monthly adjustment amount (IRMAA)?

The Social Security Administration (SSA) calls this the Income-Related Monthly Adjustment Amount, or IRMAA. Simply put, if your modified adjusted gross income (MAGI) is above a certain threshold, you'll pay more for your Part B premium. This additional amount is added to your standard premium. It's a way for Medicare to ensure that those with higher incomes contribute more to the program.

IRMAA thresholds are set by law and can change each year. The SSA typically uses your tax return from two years prior to determine if you owe IRMAA. For example, for your 2026 Medicare premiums, the SSA would generally look at your 2024 tax return. If your income was higher in 2024 than the set thresholds for 2026, you would be subject to IRMAA.

How your income is assessed

The SSA calculates your MAGI by adding certain tax-exempt interest income to your adjusted gross income (AGI) as reported on your tax return. This includes income from all sources, such as wages, self-employment, pensions, Social Security benefits, and capital gains. It's important to remember that this calculation is based on your modified adjusted gross income, not just your taxable income.

There are several income brackets, and each bracket has a corresponding IRMAA. The higher your income, the higher your IRMAA will be. These brackets are published annually by Medicare and the SSA.

What if your income has changed?

Life circumstances can change. If a major life event has caused your income to decrease significantly since the tax year used to determine your IRMAA, you may be able to appeal this decision. Examples of such events include:

• Marriage, divorce, or annulment
• Death of a spouse
• Work stoppage or reduction (including retirement)
• Loss of income-producing property
• Loss of pension income
• Receipt of a settlement payment from an employer or former employer

If you've experienced one of these events, you can contact the SSA to request a new initial IRMAA determination. You'll typically need to provide documentation to support your claim, such as tax returns from the current year, a letter from your employer, or a divorce decree. The SSA will then review your case and may adjust your Part B premium.

Understanding IRMAA can help you plan for your healthcare costs in retirement. It's a key part of Medicare that ensures the program remains sustainable while adjusting costs based on individual financial capacity. Staying informed about your potential Part B premium obligations allows you to budget effectively and avoid surprises.