Medicare 2026

Part B and Part D Late Penalties: A Birmingham Guide

BIRMINGHAM, Ala. — Some Medicare mistakes are easy to fix. Missing your sign-up window for Part B or Part D is not one of them. If you enroll late without a good reason, the government can add a penalty to your monthly premium — and in most cases, that penalty sticks with you for as long as you have Medicare.

The good news: these penalties are avoidable if you know the deadlines and act on time. Here is a plain-English guide to how the late-enrollment rules work and how to steer clear of them.

Key takeaways

• Your Initial Enrollment Period runs for seven months around your 65th birthday, and missing it can trigger lifetime penalties for Part B and Part D.
• The Part B late penalty adds 10% to your premium for every full 12 months you could have had it but didn't — and it usually lasts as long as you have Part B.
• The Part D late penalty is 1% of the "national base beneficiary premium" for each month you went without creditable drug coverage, added to your Part D premium.
• If you have job-based coverage from active employment, you likely qualify for a Special Enrollment Period and can delay Part B and Part D penalty-free.

The deadline that catches most people

Most people become eligible for Medicare at age 65. Your Initial Enrollment Period (IEP) is a seven-month window: the three months before your 65th birthday month, your birthday month, and the three months after.

If you miss that window and don't qualify for a special exception, you may have to wait for the General Enrollment Period (January 1 – March 31) to sign up for Part B — and pay a penalty for the rest of your life.

How the Part B late-enrollment penalty works

Part B covers doctor visits, outpatient care, and preventive services. If you don't sign up when you're first eligible, and you didn't have other qualifying coverage, Medicare adds 10% to your Part B premium for every full 12-month period you could have been enrolled but weren't.

For example, if you waited three full years, your Part B premium would be 30% higher — every month, for as long as you have Part B. The penalty is calculated off the standard premium, so it also grows a bit each year as premiums adjust.

How the Part D late-enrollment penalty works

Part D helps pay for prescription drugs. The rule here is simple but strict: if you go 63 days or more in a row without "creditable" drug coverage after your Initial Enrollment Period ends, you can be charged a late 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 creditable coverage. That amount is rounded and added to your Part D premium every month — again, for as long as you have Part D.

"Creditable" coverage means drug coverage that's expected to pay, on average, at least as much as a standard Medicare drug plan. Employer plans, union plans, TRICARE, and VA coverage often count — but you should get that confirmation in writing from your plan each year.

When you're allowed to delay — without a penalty

Not everyone needs to sign up at 65. If you or your spouse are still working and you have health coverage from that active employment, you may qualify for a Special Enrollment Period (SEP). That lets you delay Part B (and often Part D) and enroll later without penalty — usually within 8 months of losing the job-based coverage for Part B, and within 63 days for Part D.

A few important cautions:

• COBRA and retiree coverage do not count as active employment coverage for delaying Part B. Many people learn this the hard way.
• Marketplace (ACA) plans also don't protect you from Part B penalties once you're Medicare-eligible.
• If you have a Health Savings Account (HSA), signing up for any part of Medicare stops your HSA contributions.

If you're unsure whether your current coverage lets you safely delay, ask your benefits administrator — in writing — before your 65th birthday.

What this looks like in the Birmingham area

Birmingham is in Jefferson County, where Medicare beneficiaries have a range of Original Medicare, Medicare Advantage, and stand-alone Part D options to consider once they're enrolled. But no matter which direction you go, the enrollment deadlines and penalty rules are the same nationwide — they're set by the federal Centers for Medicare & Medicaid Services (CMS), not by any local plan.

A few program-level figures are worth knowing as you plan:

• The Part D out-of-pocket cap is $2,100.
• The Part D maximum deductible is $615.
• The old coverage gap (the "donut hole") is gone; Part D now has three phases.
• The Medicare Prescription Payment Plan lets you spread your drug costs across the year in monthly installments if that helps your budget.
• IRMAA income-related surcharges kick in above $109,000 for a single filer in 2026.

Key dates to circle

• Initial Enrollment Period: the seven months around your 65th birthday.
• General Enrollment Period: January 1 – March 31 (for people who missed their IEP).
• Annual Enrollment Period: October 15 – December 7 (to join, switch, or drop a Medicare Advantage or Part D plan).
• Medicare Advantage Open Enrollment: January 1 – March 31 (a one-time switch or return to Original Medicare).

Set a calendar reminder about 90 days before your 65th birthday. That's the earliest you can sign up, and it gives you time to sort out employer coverage questions.