Your IRA Might Drive Up Your Retirement Healthcare Costs—Here's What You Can Do About It

Most people expect to pay more in taxes if they earn more, but in retirement, even a modest income can trigger unexpected costs, especially when it comes to Medicare. One of the most commonly overlooked threats? IRMAA surcharges, which can quietly drive up your healthcare premiums by thousands of dollars a year.

Fortunately, with the right planning, a Roth conversion can help you avoid them.

What Is IRMAA and How Can it Derail Your Retirement?

IRMAA stands for Income-Related Monthly Adjustment Amount. It's a surcharge added to your Medicare Part B and D premiums if your income crosses certain thresholds. It doesn't take much to cross them.

For 2025:

A single filer with income just over $106,000 could face more than $800 per year in additional Medicare costs.
A widow with a modest IRA can easily be pushed over the limit by Required Minimum Distributions (RMDs) she doesn’t even need to spend.
A married couple with income over $212,000 could pay thousands more annually more for healthcare, just because their income crossed a line.

These IRMAA brackets are steep, and there’s no phase-in. Go even $1 over, and you’re hit with the full surcharge.

How RMDs Can Trigger IRMAA

Starting at age 73, the IRS requires you to begin withdrawing a portion of your pre-tax retirement accounts each year, whether you need the money or not. These RMDs count as income and can push you into a higher IRMAA bracket even if you live modestly.

For many retirees, especially those who saved consistently or inherited an IRA, this creates a frustrating trap: higher Medicare premiums, driven by forced distributions that they don’t actually need.

The Roth Conversion Advantage

A Roth conversion lets you shift money from a traditional IRA into a Roth IRA, paying taxes now to avoid taxes later. Done strategically, this move can:

Reduce or eliminate future RMDs, since Roth IRAs don’t have RMDs during your lifetime.
Keep your income under IRMAA thresholds, lowering future Medicare costs.
Create a pool of tax-free retirement income, giving you more control over how and when you generate taxable income.

Why It Matters

Healthcare is one of the biggest—and least predictable—costs in retirement. While you can’t control medical inflation, you can control your taxable income. Strategic Roth conversions offer a way to preemptively lower your future income, giving you more predictability and fewer surprises.

This is especially important for:

Widows or single retirees who may suddenly face IRMAA thresholds on a lower income.
Affluent savers who don’t need their RMDs but are still penalized for them.
Anyone aiming to keep Medicare costs from ballooning unnecessarily.

The Bottom Line

A well-planned Roth conversion isn’t just a tax strategy; it’s a healthcare strategy. By managing your future income now, you can sidestep costly IRMAA surcharges, reduce lifetime taxes, and bring more clarity and stability to your retirement plan.