If your Medicare Part B premium suddenly jumped this year and nobody warned you, you’ve likely been hit by IRMAA — the Income-Related Monthly Adjustment Amount. IRMAA is an extra surcharge added on top of your standard Medicare premium when your income from two years ago crossed a certain threshold. In 2026, those thresholds are catching more retirees off guard than ever, because the income Medicare uses to calculate your surcharge is from your 2024 tax return — a year when many people took large retirement account withdrawals, sold investments, or converted funds to a Roth IRA. The good news: IRMAA is not permanent, it can be appealed, and with the right planning, it can often be avoided entirely.

What exactly is IRMAA and why does it surprise so many retirees?

Most people on Medicare pay the standard Part B premium — $185.00 per month in 2025, a figure that carries into 2026 planning for most enrollees. But if your modified adjusted gross income (MAGI) — that’s your total income including tax-exempt interest — exceeded $106,000 as a single filer or $212,000 as a married couple filing jointly in 2024, Medicare adds a surcharge on top of that standard premium. These surcharges are tiered, meaning the higher your income, the more you pay. At the highest income bracket, a single retiree could pay well over $500 per month for Part B alone — nearly three times the standard rate.

The reason this surprises so many people is the two-year lookback. You retire in 2024, your income is high that year because you cashed out a pension, did a Roth conversion, or sold your home. Two years later, in 2026, Medicare sends you a bill reflecting that high-income year — even though you’re now living on a modest fixed income. It feels completely disconnected from your current reality, because it is.

How do I avoid Medicare IRMAA surcharges?

The most effective way to avoid IRMAA is to plan your income carefully in the years before you turn 65 and enroll in Medicare. Here are the key strategies retirees and pre-retirees use:

Spread out large withdrawals. Instead of taking one massive distribution from your IRA or 401(k), consider spreading withdrawals across multiple years to keep your income below the IRMAA thresholds in any single year.

Be strategic with Roth conversions. Converting traditional IRA funds to a Roth IRA is a smart long-term move, but each dollar converted counts as taxable income. Work with a financial planner to convert amounts that keep you just below the next IRMAA bracket.

Watch your Required Minimum Distributions. RMD rules for 2025 and 2026 require most retirees to start withdrawals from traditional retirement accounts at age 73. These mandatory distributions can push your income into an IRMAA bracket without any action on your part. Planning ahead — including qualified charitable distributions (QCDs), which let you donate up to $108,000 directly from your IRA to charity and exclude that amount from taxable income — can help manage your MAGI.

Time capital gains carefully. Selling appreciated investments triggers capital gains that count toward your MAGI. If possible, spread large sales across tax years or consider tax-loss harvesting to offset gains.

What if IRMAA has already hit me — can I appeal?

Yes, and this is important: you have the right to appeal an IRMAA determination if your financial situation has changed significantly since that two-year-old tax return. The Social Security Administration (which handles IRMAA determinations) recognizes several qualifying life-changing events, including retirement, divorce, death of a spouse, loss of income-producing property, and reduction in work hours.

To appeal, you file Form SSA-44 with your local Social Security office. You’ll need to provide documentation of the life-changing event and an estimate of your current year’s income. If approved, Medicare recalculates your premium based on your more recent income. This process typically takes a few weeks, and if successful, the adjustment applies going forward — you won’t always get a refund of past surcharges, so file as soon as you notice the change.

How does Social Security income affect my IRMAA calculation?

This is where things get even trickier. Up to 85% of your Social Security benefit can be included in your taxable income, depending on your overall income picture. That means the timing of when you claim Social Security matters — not just for the size of your benefit, but for how it interacts with IRMAA.

Claiming Social Security early (as soon as age 62) gives you a permanently reduced benefit but may keep your income lower in your early retirement years. Waiting until age 70 maximizes your monthly benefit — your payment grows by roughly 8% for every year you delay past full retirement age — but that larger benefit, when it finally kicks in, adds more to your taxable income and could push you into or further up the IRMAA tiers. There’s no universally right answer, but running the numbers on your specific situation is essential.

For context: if you claim at 62 versus 70, the difference in your monthly benefit can be 40% or more. That’s a significant lifetime income decision that also has Medicare cost implications most people don’t consider until it’s too late.

What are the RMD rules I need to know for 2026?

Required Minimum Distributions changed significantly under recent legislation. As of 2026, the starting age for RMDs is 73 for most retirees (it will rise to 75 for those born in 1960 or later). The amount you must withdraw each year is calculated by dividing your account balance by an IRS life expectancy factor — and as you age, the percentage you must withdraw increases.

Failing to take your full RMD results in a steep penalty — 25% of the amount you should have withdrawn (reduced to 10% if corrected promptly). More relevant to IRMAA planning: RMDs are fully taxable as ordinary income, which means a larger-than-expected account balance can create a larger-than-expected RMD, which creates a larger-than-expected IRMAA bill two years later. It’s a domino effect that catches retirees off guard, and the time to think about it is now — not after the Medicare bill arrives.

The bottom line on IRMAA in 2026

IRMAA is one of those retirement costs that flies under the radar until it lands in your mailbox. The retirees who avoid it aren’t necessarily wealthier — they’re just better informed and more proactive about managing their taxable income. Whether that means spacing out withdrawals, timing Roth conversions carefully, using charitable distributions to reduce RMD income, or appealing a surcharge based on a life change, there are real moves you can make.

The key is understanding that Medicare premiums aren’t fixed — they respond to your income decisions, and those decisions deserve as much attention as any other part of your retirement plan.

Frequently Asked Questions

When should I claim Social Security to maximise my benefit?

The longer you wait to claim Social Security — up to age 70 — the larger your monthly benefit, growing roughly 8% per year past your full retirement age. However, claiming early at 62 may make sense if you have health concerns or need income immediately. The right timing depends on your health, other income sources, and how Social Security income interacts with your overall tax situation, including potential Medicare IRMAA surcharges.

How much of Social Security is taxable?

Up to 85% of your Social Security benefit may be taxable, depending on your combined income — that’s your adjusted gross income plus any tax-exempt interest plus half your Social Security benefit. If that combined total exceeds $34,000 for single filers or $44,000 for couples, 85% of your benefit is included in taxable income. Careful income planning can help reduce how much of your benefit gets taxed.

What are the RMD rules for 2025 and 2026?

Required Minimum Distributions must begin at age 73 for most retirees in 2025 and 2026, rising to age 75 for those born in 1960 or later. The annual amount is calculated using your prior year-end account balance divided by an IRS life expectancy factor. Missing your RMD triggers a penalty of up to 25% of the amount not withdrawn, and all RMD amounts count as ordinary taxable income.

How do I avoid Medicare IRMAA surcharges?

You can reduce or avoid IRMAA by managing your modified adjusted gross income (MAGI) in the years before Medicare enrollment. Key strategies include spreading out IRA withdrawals, pacing Roth conversions to stay below income thresholds, using qualified charitable distributions to offset RMD income, and timing capital gains sales carefully. If your income has dropped significantly since the two-year lookback period, you can file an appeal with Social Security using Form SSA-44.

What is the Medicare Part B premium for 2025?

The standard Medicare Part B premium for 2025 is $185.00 per month. However, retirees with higher incomes pay more through IRMAA surcharges, with premiums potentially exceeding $500 per month at the highest income tiers. Your 2026 premium is based on your 2024 tax return income, so proactive planning now can prevent a higher bill in future years.