The $15,000 Medicare Surprise: What You Need to Know

Most people approaching Medicare have a simple expectation. They know they'll pay Medicare premiums, and they assume the cost will be predictable. But for many retirees, that’s not the case.

If you've spent decades building a significant retirement portfolio, a decision you make at 63 or 64 can affect what you pay for Medicare at 65. For some higher-income retirees, the difference can add up to thousands of dollars. That's the Medicare surprise most people don’t see coming.

Understanding Medicare Premiums

Medicare premiums aren’t the same for everyone. Medicare Part B has a standard monthly premium. However, higher-income beneficiaries can pay more than the standard premium based on their income from two years ago. This is where IRMAA, or the Income-Related Monthly Adjustment Amount, comes into play.

The basic idea is simple: Medicare looks at your income from an earlier tax year (two years ago) to determine whether you’ll pay an additional amount for Medicare Part B and prescription drug coverage this year. For example, the Medicare premiums for 2026 are generally based on income from 2024.

This creates an interesting retirement-planning problem. You might make an income decision today without realizing that Medicare will look at that income two years from now.

The Impact of Income Decisions

Let’s say you’re 63 and have spent your career saving aggressively. You have money in your IRA or 401(k), and you’re considering a large Roth conversion. Or maybe you need to take a significant withdrawal from your retirement accounts. On the surface, that might seem like a straightforward tax-planning decision. But there’s another question to ask:

What could this do to my Medicare premiums later?

A large increase in your income can push you into a higher Medicare premium bracket. That additional premium applies to each person subject to the adjustment. For a married couple, that can add up quickly. A decision that looked smart on your tax return could have another cost attached down the road. That’s why the years before Medicare are so crucial.

The $15,000 Medicare Surprise: A Closer Look

This is where the numbers get your attention. A higher-income retiree can end up paying hundreds of dollars more per month than someone paying the standard Medicare premium. Multiply that by 12 months. Then multiply it across two people. Yes, that’s right—the surcharge applies to both spouses' premiums.

Suddenly, we’re not talking about a small difference. We’re talking about thousands of dollars a year. Over multiple years, that can become a five-figure expense. That’s how a retirement-income decision can lead to what I call the $15,000 Medicare surprise.

And here’s the important part: It’s not necessarily that the Roth conversion or IRA withdrawal was a bad decision. It may have been the right decision. The problem lies in making the decision without considering the bigger picture.

Roth Conversions and Medicare: A Complex Relationship

Roth conversions and Medicare don’t exist in separate worlds. This is one reason I believe retirement planning is different from simply managing an investment portfolio. You can’t always look at one decision in isolation. A Roth conversion can help with long-term tax planning. But the amount you convert increases your taxable income for the year.

This increase can affect your tax bill, and for some retirees, it can also impact future Medicare premiums. The same idea applies to large withdrawals from retirement accounts. Sometimes you need the money. Sometimes the withdrawal makes sense. But before making a large move, it’s worth asking what else that decision might affect.

That kind of coordination becomes much more important as you approach retirement. If you plan to do Roth conversions, ensure you factor in any potential Medicare surcharges in the future.

Your Income at 63 Matters at 65

This is probably the biggest takeaway. The decisions you make in the years leading up to Medicare don’t just stay in that year. They can have consequences later. That’s why I don’t think retirement planning should start six months before you retire.

If you’re sitting on $2 million, $3 million, $4 million, or $5 million of retirement assets, you have more decisions to coordinate than someone who simply needs to figure out where their next paycheck is coming from. You have to think about withdrawals, taxes, Roth conversions, Social Security, Medicare, and how those pieces fit together.

The goal isn’t to avoid paying taxes at all costs. Sometimes paying taxes today can make sense. Sometimes a Roth conversion can be beneficial even if it increases your income. The key is to understand the trade-offs before making a decision.

The Best Medicare Planning Happens Before Enrollment

By the time you turn 65, some decisions affecting your Medicare premiums may already be in the rearview mirror. That’s why the years before Medicare deserve more attention than they usually get. If you’re approaching retirement with significant savings, don’t just ask: “How much will Medicare cost me?”

Ask: “What can I do today that could affect what Medicare costs me later?”

That’s a much more useful retirement-planning question. Your retirement income strategy, tax strategy, and Medicare strategy shouldn’t exist in separate boxes. They all affect each other. When you’re dealing with millions of dollars, those connections are worth paying attention to.

A good retirement plan isn’t just about how much money you have. It’s about understanding how your decisions today can affect your taxes, your Medicare premiums, your spending, and the life you’re trying to build in retirement.

Because the goal isn’t just to retire with money. It’s to know how to use that money wisely once you get there.

If this way of thinking resonates with you, book a time on my calendar to talk about all the pieces of your plan. You can find the link here: https://www.buoyantwealth.com/contact