Why Medicare Premiums Go Up and How IRMAA Works
Why Medicare premiums can change
Every year, I see someone caught off guard by this.
A client opens a letter from Social Security, sees their Medicare premium went up, and panics.
It’s not a mistake. It’s something called IRMAA — short for Income-Related Monthly Adjustment Amount.
Basically, the more income you show on your tax return, the more you pay for Medicare Parts B and D.
Here’s the frustrating part: you’re getting the same healthcare as everyone else over 65 — you’re just paying more for it.
That higher premium isn’t buying you better doctors, shorter wait times, or a faster line at the pharmacy. It’s simply an income-based surcharge layered on top of your standard Medicare cost.
How IRMAA uses modified adjusted gross income
The surprise? IRMAA looks at income from two years ago. So what you did in 2023 affects what you pay in 2025.
Related planning guidance: Tax Planning
That means a Roth conversion, a large capital gain, the sale of real estate, or even a one-time distribution can trigger higher Medicare costs down the road.
It’s a delayed reaction — and that’s what catches people off guard.
I’ve had clients do everything right in a tax-planning year — convert to a Roth, sell an investment, reposition assets — and then two years later, they get that dreaded letter saying their Medicare premium jumped hundreds of dollars a month.
It feels unfair, but it’s not random. The government’s just following the formula.
Why the two-year lookback matters
Here’s the good news: it’s manageable.
If you plan conversions and income events carefully, you can fill the lower tax brackets without crossing into the next IRMAA tier. Those brackets work a lot like tax brackets — each step up adds cost, but small moves within a level don’t hurt you.
There’s actually some alignment between the IRMAA brackets and the federal tax brackets, and those tend to set our ceilings for Roth conversions. As an example, there’s not much difference between the federal 22% and 24% brackets in terms of federal tax owed, but there’s a big jump in what you pay for Medicare Part B. Those IRMAA thresholds can help inform how far to go with Roth conversions or capital gains in a given year, though the appropriate strategy varies based on each person’s broader tax, income, and planning situation.
That’s why we look at everything together: taxable income, capital gains, Social Security timing, and Roth strategies. The goal isn’t to avoid IRMAA completely — it’s to control when and how it hits.
For many people, a short-term IRMAA increase is worth it.
Income decisions that can trigger a surcharge
Let’s say you convert to a Roth over a few years and pay a little more in Medicare premiums temporarily. Down the road, that Roth income is tax-free — which means lower taxes for the rest of your life, and no IRMAA surprise later on. Sometimes a small bump today saves you a fortune tomorrow.
Related planning guidance: Tax Planning
And remember — IRMAA isn’t forever.
If your income drops, your premiums can go back down. You just have to appeal and show the change. Social Security even has a specific form for this called SSA-44, where you can document a “life-changing event” such as retirement, loss of income, or the death of a spouse.
That appeal can reset your premiums and get your costs back where they should be.
Single clients tend to feel IRMAA the hardest. When one spouse passes away, the surviving spouse moves from “married filing jointly” to “single.” The same level of income can suddenly trigger higher tax brackets and higher Medicare premiums.
It’s one of those situations that doesn’t get talked about enough — your costs can rise just because your filing status changed, even though your income didn’t. It’s the system’s way of saying, “Congratulations, you’re now paying more for the same healthcare.”
When an IRMAA appeal may apply
That’s why planning around both taxes and Medicare matters, especially in later years. It’s not about chasing perfection — it’s about avoiding surprises.
The truth is, you can’t always escape IRMAA. Some years, it just makes sense to take the hit.
If you’re doing a large Roth conversion to reduce future RMDs, selling a business, or repositioning assets in a tax-efficient way, you might see a temporary premium spike. That’s okay — as long as it’s part of a bigger plan.
The mistake is when people make those moves accidentally, without realizing what’s coming two years later.
Awareness is the best defense.
If you know your income will spike — from a conversion, a home sale, or a large distribution — you can prepare for the impact ahead of time, or spread it across multiple years to smooth out the effect.
How tax planning can reduce surprises
IRMAA shouldn’t scare anyone away from smart tax planning. It just needs to be part of the conversation.
Medicare costs are one of the biggest expenses in retirement. Understanding how IRMAA works gives you leverage. You can’t control the formula, but you can control what income shows up on your tax return — and when.
So if that letter shows up from Social Security and your premium jumps, don’t panic. It probably means something you did two years ago worked exactly the way it was supposed to — you just need to plan for it.
A good advisor will help you anticipate it, build around it, and make sure the short-term cost doesn’t derail the long-term benefit.
Because when it comes to IRMAA, knowledge really is power — and planning ahead is the best medicine you can get.
