Key Takeaways

• Understanding IRMAA and monitoring your income sources can help you avoid unexpected Medicare cost increases.
• Being proactive and aware of appeal options can help you manage IRMAA surcharges more effectively.

Planning for retirement means staying prepared for all kinds of surprises, especially when it comes to healthcare expenses. One area that often catches people off guard is IRMAA—an extra charge in Medicare based on income. Here’s what you need to know for 2026 to help you approach these costs with confidence and clarity.

What Is IRMAA?

Definition and purpose

IRMAA stands for Income-Related Monthly Adjustment Amount. It’s an extra charge added to Medicare Part B and Part D premiums for people whose income exceeds certain thresholds. The purpose of IRMAA is to ask those with higher incomes to contribute more to the cost of their Medicare coverage, ensuring the program’s financial balance.

Who it applies to

IRMAA affects anyone enrolled in Medicare Part B or Part D whose income goes over specific limits. These limits are set and updated yearly, based on the modified adjusted gross income (MAGI) reported on your tax return. Not everyone will pay IRMAA—if your income is below the annual threshold, you only pay the standard Medicare premiums. But if your income tips over the line, IRMAA may apply regardless of whether you’re actively working or already retired.

How Are IRMAA Surcharges Calculated?

Income thresholds overview

Each year, the government establishes income brackets that define who will owe IRMAA and at what level. These brackets are directly tied to your reported MAGI from two years prior. For example, your IRMAA amount in 2026 is based on your 2024 tax return data. The higher your reported income, the higher the surcharge. It’s important to monitor changes in these thresholds, as shifting from one bracket to another can result in increased Medicare costs.

Sources of income considered

MAGI includes a broad array of income streams—Social Security benefits, pensions, withdrawals from retirement accounts, interest, dividends, and rental income are all included. Even capital gains from selling investments, as well as required minimum distributions (RMDs), are factored in. The diversity of income sources that count toward IRMAA highlights the importance of tracking all streams, not just wages or salaries.

Which Income Counts Toward IRMAA?

Types of retirement income

Many retirees are surprised to discover just how much income is counted for IRMAA purposes. Common sources include traditional IRAs and 401(k) distributions, Social Security, pension payouts, taxable investment income, and even some employer-sponsored benefits. Roth IRA withdrawals, if qualified, typically do not impact MAGI, but the rules around this can be nuanced.

Common mistakes to avoid

One frequent mistake is assuming only “earned income” affects IRMAA. In reality, retirement account withdrawals, realized gains, and some forms of non-wage income count, too. Overlooking these sources may lead you to underestimate future surcharges. Another pitfall is not realizing that one-time events, such as selling property, can temporarily raise your MAGI and trigger a one-year IRMAA increase. Advance awareness helps reduce the chance of being caught off-guard.

Can You Appeal an IRMAA Determination?

Life-changing event examples

If you experience a significant life change—such as retirement, divorce, marriage, or the loss of a spouse—you may be eligible to appeal your IRMAA determination. Life-changing events include things like the reduction or loss of income from retirement, the death of a loved one, or a significant financial shock that isn’t reflected in your two-year-old tax return.

Appeal process basics

To request an IRMAA review, you’ll need to provide written evidence of the event and complete the appropriate Social Security form. Supporting documentation—such as a retirement letter, marriage certificate, or proof of income reduction—is crucial. The Social Security Administration will then reassess your new circumstances. While the process can take time, providing thorough documentation improves your chances of a successful outcome.

What Happens If Your Income Changes?

Reevaluation timeline

Each year, the Social Security Administration examines tax returns from two years prior to set IRMAA amounts for the current year. However, if your income drops due to a qualifying life event, you don’t have to wait until the next automatic review. Filing an appeal allows you to have your current situation considered sooner.

Potential adjustments

If Social Security approves your appeal or if your income decreases because of a recognized qualifying event, your IRMAA surcharges could be lowered or even removed. Remember that increases as well as decreases in your income can affect your IRMAA obligation, so it’s helpful to keep up to date with your records and understand what triggers a change.

How Can You Prepare for IRMAA?

Awareness and documentation

Preparation starts with awareness. Review your tax situation regularly and keep thorough records of your retirement income, withdrawal activities, and any special circumstances. If you anticipate hitting a new income bracket—perhaps because of a planned withdrawal or asset sale—document the rationale and be prepared to explain it, should you need to appeal.

Planning considerations

Planning for IRMAA might mean adjusting the timing of certain withdrawals or spreading out events that will increase your income. For instance, careful coordination of retirement account distributions across years can sometimes help manage surcharges. It’s also wise to project ahead to see how future decisions today might reflect on your two-year-forward IRMAA calculations.

Does IRMAA Affect All Retirees Equally?

Factors influencing impact

IRMAA’s impact can be very different from one individual or household to another. Your mix of retirement accounts, timing of withdrawals, taxable and nontaxable income, and unique life events all play a role. For those with primarily tax-free sources of retirement income, exposure to IRMAA is lower than for those relying more on taxable withdrawals.

Why awareness matters

Staying informed about IRMAA is essential, even if you’re not currently subject to a surcharge. Rules change, income levels shift, and unplanned events happen. By staying alert and educated, you set yourself up to recognize potential IRMAA challenges early and respond with strategies that fit your personal retirement picture.

Understanding IRMAA helps you see the full picture of Medicare costs in retirement and gives you tools to plan more effectively. Regular review of your income sources, keeping thorough records, and knowing your options all contribute to a smoother retirement experience.