Retirement should be about enjoying the years you worked so hard for, not worrying about surprise bills. But Medicare has a few quirks that can catch people off guard. Think of them as speed bumps you don’t see until you’re right on top of them. Beyond the monthly premium, there are penalties and surcharges that stick with you for the long haul. They may seem small at first, but like a slow leak in your roof, they can add up to major damage over time. And when you’re living on a fixed income, even a few hundred dollars a year can be the difference between “comfortable” and “tight.”
Quick takeaway: Some of the biggest Medicare cost traps to watch for are the Medicare Part B late-enrollment penalty, the Medicare Part D penalty, IRMAA surcharges, and prescription coverage gaps.
Here’s what to know about these hidden costs, and what you can do about them.
How Does Your Income Affect Medicare Premiums?
If your income is on the higher side, you might notice your Medicare premiums aren’t the same as your neighbor’s. That’s thanks to the Income-Related Monthly Adjustment Amount (IRMAA), which is based on your tax return from two years ago.
What is IRMAA for 2025? It’s a sliding scale of surcharges added to your Part B and Part D premiums if your income exceeds certain thresholds. IRMAA brackets for 2025 are typically announced in the fall, and the calculation is based on your modified adjusted gross income from two years prior.
What does this mean for you? Essentially, the way you plan and report income today can affect your Medicare costs down the road.
We’ve seen this catch plenty of smart retirees by surprise, but the good news is, it’s something you can prepare for. That’s where working with a fiduciary financial advisor who integrates tax planning with retirement income planning can really pay off.
What Happens If You Don’t Sign Up for Medicare on Time?
The consequences of missing your Medicare enrollment window depend on which part of Medicare you delayed, but in every case, timing matters.
For example: If you don’t sign up for Medicare Part B (medically necessary services and preventive care) or Medicare Part D when you’re first eligible, and you don’t have other creditable coverage, you’ll face a permanent surcharge.
This is called the Medicare late-enrollment penalty. The Part B late-enrollment penalty adds 10% for each full 12-month period you could have had coverage but didn’t. The Part D penalty adds 1% per month you delayed.
These aren’t one-time fines. They’re permanent increases to your monthly costs, a financial “shadow” that follows you through retirement. That alone is reason enough to start planning. Because you don’t get a do-over, and that’s money you worked hard for (better spent on dinners out, travel, or spoiling the grandkids, in our opinion).
How Can You Avoid Medicare Penalties, Late-Enrollment Fees, & IRMAA?
- Review your Medicare coverage every year during open enrollment
- Plan ahead for IRMAA with proactive tax strategies
- Coordinate Medicare decisions with your retirement income plan
- Check prescription drug coverage carefully to avoid gaps in coverage
At The CP Welde Group, we’ve walked plenty of retirees through these tricky corners of Medicare, and we know how easy it is to miss something. That’s why we don’t look at healthcare in isolation: we fold it right into your tax and income planning.
The goal? A retirement that runs smoothly, without the unwanted financial surprises. We’re here to make sure you’re not paying more for Medicare than you need to. A short, pressure-free conversation now could save you years of unnecessary costs. Let’s talk.
🎧 Know more so you can do more: Hear founder Charles Welde, CPA, CFP®, break down complex financial topics into actionable advice on our Re-Engineering Your Finances podcast, streaming now wherever you listen.
Medicare Penalties & IRMAA FAQ
H3: What is the Medicare Part B late-enrollment penalty?
If you miss your initial enrollment period and don’t have other creditable coverage, your Part B premium goes up 10% for each 12-month period you delayed, and that surcharge is permanent.
What is the Medicare Part D late-enrollment penalty?
You’ll pay an extra 1% of the national base premium for each month you delayed enrollment without creditable prescription coverage.
How is IRMAA calculated for 2025?
IRMAA uses your modified adjusted gross income from two years ago (so, 2023 tax returns for 2025 premiums). Surcharges apply if your income crosses certain thresholds, which are typically announced each fall.
How much is IRMAA for 2025?
Surcharges can range from around $70 to several hundred dollars per month, depending on income brackets.
What can you do to help avoid IRMAA?
With proactive planning—strategies like managing taxable income, coordinating Social Security, and timing withdrawals can reduce exposure. A fiduciary financial advisor can help you design a plan.