Medicare 2026

How Medicare late-enrollment penalties work in Downers Grove

Downers Grove, Illinois — Medicare has a few deadlines that don't get talked about enough. Miss one, and you could pay extra every month for as long as you have coverage. The good news: once you understand how the late-enrollment penalties for Part B and Part D work, they're not hard to avoid.

Here's what folks in and around Downers Grove need to know.

Why Medicare has late-enrollment penalties

Medicare is built on the idea that most people should sign up when they're first eligible. That keeps the risk pool balanced — younger, healthier retirees help cover the cost of care for those who need more of it. To encourage on-time enrollment, Medicare adds a permanent surcharge to your premium if you delay Part B (doctor visits and outpatient care) or Part D (prescription drugs) without a good reason.

The word "permanent" is the part that trips people up. These aren't one-time fees. They stay attached to your monthly premium for life.

The Part B late-enrollment penalty

If you don't sign up for Part B when you're first eligible — and you don't have other qualifying coverage — your Part B premium goes up by 10% for each full 12-month period you could have had it but didn't. That extra amount is added to your monthly premium for as long as you have Part B.

So someone who waits three years to enroll would pay an extra 30% every month, on top of whatever the standard Part B premium is that year. Ten years late? An extra 100%.

Most people are first eligible during their Initial Enrollment Period, a seven-month window around their 65th birthday — the three months before, the birthday month, and the three months after. If you miss it, the General Enrollment Period runs January 1 through March 31 each year, with coverage starting the month after you enroll.

The Part D late-enrollment penalty

Part D has its own penalty, and it works a little differently. If you go 63 or more days in a row without Part D or other "creditable" drug coverage after you're first eligible, you can owe a penalty when you finally sign up.

The math: Medicare multiplies 1% of the "national base beneficiary premium" by the number of full months you went without coverage. That amount is added to your Part D premium every month, for life. The national base premium can change each year, so the penalty can shift slightly over time.

"Creditable" coverage is drug coverage that Medicare considers at least as good as a basic Part D plan — usually through an employer, union, or the VA. If you have it, keep the letter your plan sends you each year confirming that. It's your proof.

The key deadlines to circle

• Initial Enrollment Period: the 7 months around your 65th birthday.
• General Enrollment Period (Part B): January 1 – March 31.
• Medicare Annual Enrollment Period: October 15 – December 7, for Part D and Medicare Advantage changes.
• Medicare Advantage Open Enrollment: January 1 – March 31, for people already in a Medicare Advantage plan.
• Special Enrollment Periods: available when you lose job-based coverage, move, or have other qualifying life events. These can protect you from penalties if you act within the allowed window (usually 8 months for Part B after employer coverage ends, 63 days for Part D).

How Downers Grove fits in

Downers Grove is in DuPage County, where residents have a wide range of stand-alone Part D drug plans and Medicare Advantage plans with drug coverage to choose from during the Annual Enrollment Period. That's helpful, but it doesn't change the deadlines — the penalty rules are federal and apply everywhere.

If you're still working past 65 and have solid employer coverage, you may be able to safely delay Part B and Part D. But not every employer plan counts as creditable, and the rules are different for companies with fewer than 20 employees. It's worth checking before assuming you're covered.

2027 Part D at a glance

While we're talking about drug coverage, a few 2027 figures are worth knowing:

• $2,400 — the annual out-of-pocket cap on covered prescriptions under Part D in 2027.
• $700 — the maximum Part D deductible a plan can charge in 2027.
• The old coverage gap ("donut hole") is gone, replaced by a simpler three-phase structure that began in 2025.
• The Medicare Prescription Payment Plan lets you spread your drug costs across the year in monthly installments instead of paying all at once at the pharmacy.
• IRMAA surcharges — extra premiums for higher-income enrollees — start above $109,000 in income for a single filer in 2026.

None of these change the penalty rules, but they're the backdrop for any Part D decision you make.