Taking a large Required Minimum Distribution (RMD) from your IRA or 401(k) can unexpectedly push your income over a Medicare threshold — triggering surcharges called IRMAA that add hundreds of dollars per month to your Part B and Part D premiums. This is the RMD trap: money you were forced to withdraw quietly ripples forward two years and inflates your Medicare bill before you even realize what happened. Understanding how the trap works, and how to sidestep it, can save a typical retiree $1,000 or more every single year.
What happened to one retiree — and why it matters to you
Imagine you turned 73 in 2024 and took your first RMD — a required lump sum from a traditional IRA you’d been growing for decades. Your RMD came to $42,000. Added to your Social Security and a small pension, your total income for 2024 crossed $106,000. You didn’t think much of it. Then, in late 2025, you got a letter from Medicare: your 2026 Part B premium was jumping from $185 a month to $259 a month. That’s an extra $888 a year — just for one income bump two years earlier.
This is exactly how IRMAA (Income-Related Monthly Adjustment Amount) works. Medicare looks back at your tax return from two years prior to set your current premium. A one-time spike in income — from an RMD, a Roth conversion, or even the sale of a rental property — can follow you into your Medicare bill long after the money is spent.
What are the RMD rules for 2025 and 2026?
RMD rules require most people to begin withdrawing from traditional IRAs, 401(k)s, and similar tax-deferred accounts starting at age 73 (a change that took effect under the SECURE 2.0 Act). The IRS calculates your RMD each year by dividing your account balance as of December 31 of the prior year by a life-expectancy factor from official IRS tables.
For 2025 and 2026, the rules remain the same: if you turned 73 by December 31 of the relevant year, you must take your RMD by December 31 — or face a penalty of 25% of the amount you should have withdrawn (reduced to 10% if you correct it quickly). There is no option to skip or defer an RMD once you’ve crossed the age threshold, which is exactly why planning around it matters so much.
How do Medicare IRMAA surcharges work?
IRMAA is Medicare’s way of charging higher-income retirees more for their coverage. In 2026, the standard Medicare Part B premium applies to individuals with a Modified Adjusted Gross Income (MAGI) of $106,000 or less (or $212,000 for married couples filing jointly). Once your income crosses that line, your premium jumps in tiers — and each tier adds a meaningful surcharge on top of the base premium.
Here’s the critical detail: Medicare uses your tax return from two years ago to set today’s premium. So your 2026 Medicare costs are based on your 2024 income. A one-time RMD that pushed you over the threshold in 2024 can cost you real money in 2026, even if your income has since dropped back down.
The good news: you can appeal an IRMAA surcharge if your income has since decreased due to a life-changing event — such as retirement, divorce, or the death of a spouse. This is called a Life-Changing Event appeal, and it’s worth filing if your circumstances have genuinely changed.
How do I avoid Medicare IRMAA surcharges?
The most effective strategies involve smoothing your income so you never spike over a threshold in a single year. Here are the most practical tools:
Roth conversions before RMDs begin. If you’re in your 60s and not yet taking RMDs, consider converting portions of your traditional IRA to a Roth IRA each year. You pay tax now, at a controlled rate, and shrink the account that will eventually generate mandatory withdrawals. Roth IRAs have no RMDs during the owner’s lifetime.
Spread large withdrawals across years. If you have flexibility, withdrawing slightly more than your RMD in a lower-income year — rather than letting balances grow and forcing a huge RMD later — can help flatten the income curve.
Qualified Charitable Distributions (QCDs). If you’re 70½ or older, you can direct up to $105,000 per year (2026 limit, indexed for inflation) from your IRA straight to a qualifying charity. The amount counts toward your RMD but is excluded from your taxable income entirely. That’s a powerful tool for reducing MAGI without giving up the withdrawal.
Time your other income carefully. Selling investments, doing Roth conversions, or receiving deferred compensation in the same year as a large RMD can stack income in ways that push you over an IRMAA tier unnecessarily.
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When should I claim Social Security to maximize my benefit?
Social Security timing ties directly into this conversation, because your benefit becomes part of your MAGI calculation the moment you claim it. Claiming early (as young as 62) locks in a permanently reduced benefit — as much as 30% less than your full retirement age amount. Waiting until 70 earns you delayed credits worth 8% per year beyond full retirement age.
For many retirees, the sweet spot involves delaying Social Security while living on IRA withdrawals or doing Roth conversions in the early retirement years — years when income is lower — and then claiming a larger Social Security benefit later. Just be aware that once Social Security kicks in, it adds to the income picture for IRMAA calculations.
How much of Social Security is taxable?
Up to 85% of your Social Security benefit can be subject to federal income tax, depending on your combined income (adjusted gross income plus non-taxable interest plus half of your Social Security benefit). If that combined figure exceeds $34,000 for a single filer or $44,000 for a couple, 85% of your benefit is taxable. This taxable portion also flows into your MAGI — which means a big RMD can make more of your Social Security taxable in the same year, compounding the income hit.
The bottom line on the RMD trap
The RMD trap is sneaky because the income and the Medicare bill arrive two years apart. Most retirees don’t connect the dots until the premium letter lands in the mailbox. The solution is proactive planning: know your IRMAA thresholds, model your RMDs years in advance, and use tools like QCDs and Roth conversions to keep your income in a comfortable zone.
A conversation with a fee-only financial planner or tax professional who specializes in retirement income can pay for itself many times over — especially in the years just before and after RMDs begin.
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Frequently Asked Questions
What are the RMD rules for 2025 and 2026?
Under the SECURE 2.0 Act, Required Minimum Distributions must begin at age 73 for most retirement accounts, including traditional IRAs and 401(k)s. Your annual RMD is calculated by dividing your prior year-end account balance by an IRS life-expectancy factor. Missing an RMD triggers a penalty of 25% of the amount not withdrawn, reduced to 10% if corrected promptly.
How do I avoid Medicare IRMAA surcharges?
The most effective strategies include using Qualified Charitable Distributions (QCDs) to satisfy RMDs without adding to taxable income, doing Roth conversions in lower-income years before RMDs begin, and spreading large withdrawals across multiple years to stay below IRMAA income thresholds. You can also appeal a surcharge if your income has dropped due to a qualifying life-changing event.
What is the Medicare Part B premium for 2025 and 2026?
The standard Medicare Part B premium for 2025 was $185 per month for individuals with income at or below $106,000. In 2026, that base premium applies to the same income threshold, but higher earners face IRMAA surcharges that can push the monthly cost to $259, $369, or more depending on their income tier. Medicare uses your tax return from two years prior to set each year’s premium.
When should I claim Social Security to maximize my benefit?
Claiming Social Security at 70 delivers the maximum possible monthly benefit — up to 32% more than claiming at full retirement age, and up to 77% more than claiming at 62. For every year you delay past full retirement age, your benefit grows by 8%. The right timing depends on your health, other income sources, and how your Social Security interacts with your overall tax and Medicare picture.
How much of Social Security is taxable?
Up to 85% of your Social Security benefit may be subject to federal income tax if your combined income — AGI plus non-taxable interest plus half your Social Security — exceeds $34,000 for single filers or $44,000 for married couples filing jointly. A large RMD in the same year can push more of your Social Security into taxable territory, amplifying the total income impact.