Medicare 2026

How Medicare late-enrollment penalties work for Jackson residents

# Medicare late-enrollment penalties: how they work and how to avoid…

JACKSON, Miss. — If you're getting close to Medicare age, one of the most important things to understand isn't which plan to pick — it's when to sign up. Miss your window for Part B or Part D, and Medicare can add a penalty to your premium that sticks with you for as long as you have that coverage. The good news: these penalties are avoidable once you know the rules.

How the Part B penalty works

Part B covers doctor visits, outpatient care, and many preventive services. If you don't sign up when you're first eligible — and you don't have other qualifying coverage — Medicare adds 10% to your monthly Part B premium for every full 12-month period you went without it.

That penalty is not a one-time fee. In most cases, you pay it every month for as long as you have Part B. So a delay of a few years can quietly raise your premium for the rest of your life.

You also can't sign up any time you want. Outside your Initial Enrollment Period, Part B usually has set enrollment windows, which means a missed deadline can also mean months without coverage.

How the Part D penalty works

Part D is prescription drug coverage. The penalty here is calculated differently: Medicare takes 1% of the "national base beneficiary premium" and multiplies it by the number of full months you went without Part D or other creditable drug coverage after your Initial Enrollment Period ended.

That amount is added to your Part D premium each month, and it can change slightly year to year as the base premium changes. Like the Part B penalty, it generally lasts as long as you have Part D coverage.

One important note as you look at 2027 coverage: Part D has an out-of-pocket cap of $2,100 in 2026 and $2,400 in 2027, and a maximum deductible of $615 in 2026 and $700 in 2027. The old "donut hole" coverage gap is gone. Skipping Part D to save on a premium can be a costly bet if you ever need expensive medications later.

When you're expected to enroll

Most people become eligible for Medicare at 65. Your Initial Enrollment Period is seven months long: the three months before your 65th birthday month, your birthday month, and the three months after.

If you miss that window and don't have other qualifying coverage, you may have to wait for the General Enrollment Period (January 1 – March 31) for Part B, with coverage starting the month after you enroll. For Part D and Medicare Advantage, the Annual Enrollment Period runs October 15 – December 7 each year.

When a delay is allowed (Special Enrollment Periods)

Not everyone has to sign up at 65. If you or your spouse is still working and you have group health coverage from that job, you can usually delay Part B without a penalty and enroll later through a Special Enrollment Period.

For Part D, the key phrase is "creditable coverage" — drug coverage that Medicare considers at least as good as a standard Part D plan. Employer plans, some retiree plans, and TRICARE often qualify. Each year, your plan should send you a notice telling you whether your drug coverage is creditable. Save those notices. You may need them to prove you don't owe a penalty.

COBRA and retiree-only coverage generally do NOT count as active employer coverage for delaying Part B. This trips up a lot of people, so check before you assume you're covered.

What this looks like in the Jackson area

Jackson is in Hinds County, where Medicare beneficiaries can choose Original Medicare (Parts A and B) plus a stand-alone Part D plan, or a Medicare Advantage plan that often includes drug coverage. Multiple carriers and plans are available in the county each year, and the specific lineup can change at the Annual Enrollment Period.

The point isn't which plan you pick first — it's that you enroll in some form of Part B and creditable drug coverage on time. That's what protects you from penalties later.

How to avoid the penalties — a simple checklist

• Mark your Initial Enrollment Period on the calendar three months before your 65th birthday.
• If you're working past 65, confirm in writing that your employer coverage lets you delay Part B, and ask HR for a letter you can keep.
• Each fall, check that your drug coverage is still "creditable" — the notice should arrive by mid-September.
• If you lose job-based coverage, act quickly. Special Enrollment Periods have deadlines, usually eight months for Part B and about two months for Part D.
• If income is tight, ask about Extra Help (also called the Low Income Subsidy) for Part D and about Medicare Savings Programs for Part B.

Where to get personal help

Penalty questions get personal fast, and one wrong assumption can cost you every month. For free, unbiased help in Mississippi, contact the State Health Insurance Assistance Program (SHIP) through the Mississippi Department of Human Services. You can also call 1-800-MEDICARE (1-800-633-4227) or visit medicare.gov to check enrollment periods and confirm your coverage status.