Do I need to enroll in Medicare if I already have health insurance through my employer?

If you or your spouse are actively working and covered by a group health plan, you can usually delay Part B without penalty. Once that employment or coverage ends, you get an 8-month window to enroll without triggering the late penalty.

Can I get rid of the late enrollment penalty once I'm charged it?

Generally no. The Part B penalty is added to your premium for as long as you have Part B coverage, so it's worth confirming your enrollment timing carefully rather than trying to fix it after the fact.

What is IRMAA and how do I know if it applies to me?

IRMAA is an income-based surcharge added to Part B (and Part D) premiums for higher earners, based on your tax return from two years prior. If your income was above roughly $109,000 (single) or $218,000 (joint) two years ago, expect a higher premium.

Medicare Enrollment: What It Actually Costs and When You Need to Sign Up

Medicare's 7-month enrollment window can cost you a lifetime penalty if you miss it. Here's what it costs in 2026 and how to time it right.

Most people spend decades planning for retirement savings and almost no time planning for Medicare enrollment. That's a mistake. Sign up late, and you can end up paying a penalty on top of your premium for the rest of your life. Sign up at the wrong time relative to your income, and you can get hit with a surcharge you didn't see coming. This isn't complicated once you know the rules — but the rules are unforgiving if you miss them.

What Medicare Actually Costs in 2026

Medicare isn't free, even though it's often talked about that way. Part A (hospital coverage) is premium-free for most people if you or your spouse paid Medicare payroll taxes for at least 10 years. Part B (doctor visits, outpatient care) is a different story.

The Centers for Medicare & Medicaid Services (CMS) has set the standard monthly Part B premium at $202.90 in 2026, an increase of $17.90, or just under 10 percent, from the 2025 premium of $185.00. On top of the monthly premium, the annual deductible for all Medicare Part B enrollees in 2026 will be $283, an increase of $26 from the 2025 deductible of $257.

If you don't have creditable prescription drug coverage elsewhere, you'll also want to budget for a Part D plan, which has its own premium that varies by plan and can carry its own income-based surcharge.

The Enrollment Window You Can't Miss

Everyone gets an Initial Enrollment Period (IEP) built around their 65th birthday. This period begins 3 months before your 65th birthday and ends 3 months after your birthday, for a total of 7 months.

If you're already collecting Social Security when you turn 65, you're typically enrolled automatically. If you're not, you have to sign up yourself — and it's on you to know the deadline. If you miss your 7-month Initial Enrollment Period, you may have to wait to sign up and pay a monthly late enrollment penalty for as long as you have Part B coverage.

What Happens If You're Still Working Past 65

Plenty of people work well into their late 60s, and Medicare has a carve-out for that. If you or your spouse have group health coverage through active employment, you can delay Part B without a penalty. That's an 8-month period that begins when your employer coverage ends or you stop working, whichever comes first.

The key word is active employment. COBRA coverage, retiree health plans, and individual marketplace plans don't count as creditable coverage for this purpose — enrolling based on those can leave you unknowingly racking up a penalty.

The Late Enrollment Penalty, in Real Numbers

This is the part people underestimate. For each 12-month period you delay enrollment in Medicare Part B, you will have to pay a 10% Part B premium penalty, unless you have insurance based on your or your spouse's current work. And in most cases, you will have to pay that penalty every month for as long as you have Medicare.

Here's what that looks like in practice: if you delayed enrollment in Part B for seven years and you did not have employer insurance, your monthly premium would be 70% higher for as long as you have Medicare — since the base Part B premium in 2026 is $202.90, your monthly premium with the penalty will be $344.93.

That's not a one-time fee. That's an extra $142 a month, every month, indefinitely — money that could otherwise go toward retirement income or savings.

IRMAA: When Your Income Pushes Your Premium Higher

Medicare Part B premiums also scale with income through the Income-Related Monthly Adjustment Amount (IRMAA), based on your tax return from two years earlier. Those with a modified adjusted gross income of less than or equal to $109,000 (for individual filers) or $218,000 (for joint filers) will pay the base amount of $202.90.

Above that, the surcharges step up quickly. Those with income from $109,001 to $137,000 (individual) or $218,001 to $274,000 (joint) will pay $284.10 in 2026, up from $259 in a similar bracket in 2025. At the top end, married beneficiaries who file separately and have income above $109,000 but below $391,000 will pay $649.20 a month, and those at or above $391,000 will pay $689.90 per month.

If a big one-time event — a Roth conversion, a large capital gain, RSU vesting — pushed your income up two years ago, don't be surprised by a higher Part B bill. You can appeal an IRMAA determination if the income spike was tied to a specific life event, like retirement or a job loss, using Social Security's appeal process.

A Simple Enrollment Checklist

Mark your 7-month Initial Enrollment Period on a calendar the year you turn 64, not 65.
Confirm whether your current health coverage is truly "creditable" if you plan to delay Part B.
If you're retiring, sign up for Part B before your employer coverage ends, or within 8 months after.
Check your income from two years prior to estimate whether IRMAA will apply.
Budget for the Part B premium and deductible as a fixed retirement expense, not an afterthought.

Getting Medicare timing right is one of those unglamorous details that quietly protects your retirement budget for decades. It's the same reason it's worth running your full financial picture through a tool like Grade My Finance every so often — the goal isn't a perfect score, it's catching the gaps, like an enrollment deadline, before they turn into a permanent cost.