Medicare · Cornerstone
Medicare late enrollment penalties, in actual dollars
Last reviewed June 11, 20263 min readBy the Goodsurance editorial team Reviewed by the Goodsurance editorial team
"The penalty" is not one thing. Medicare has three distinct late-enrollment penalties, and they differ in how they are calculated, how long they last, and how easy they are to trigger by accident. The two that matter most for the typical person, Part B and Part D, share an unwelcome feature: they generally last for life. The point of this page is to make each one concrete enough that you can see exactly what is at stake and, more usefully, how to avoid it.
1Part B: the lifetime mistake
This is the big one, both because Part B has a real monthly premium and because the penalty is permanent. If you do not sign up for Part B when you are first eligible and you do not have other qualifying coverage, the penalty adds 10% to your Part B premium for each full 12-month period you went without. It is added to your premium every month for as long as you have Part B, and because the base premium tends to rise over time, the dollar amount of the penalty tends to rise with it.
A concrete sense of scale: someone who delayed Part B for three full years would face roughly a 30% surcharge, about $61 a month, roughly $730 a year, for life. The Part B penalty has its own dedicated page that works through the math; this is the summary.
| Penalty | Trigger | Formula | Duration |
|---|---|---|---|
| Part A | Only if you buy Part A | A temporary surcharge | Limited period |
| Part B | Late without protected coverage | 10% per full 12 months | For life |
| Part D | 63+ days without creditable coverage | 1% of the base per month | For life |
Three penalties, three rules. Source: CMS.
2Part D: the quiet one people forget
The Part D penalty is easy to overlook precisely because Part D feels optional when you are healthy. If you go without creditable drug coverage for 63 or more days in a row after your initial window, you can owe a penalty when you finally enroll. It is calculated from the number of months you went without and a national base figure, then added to your Part D premium for as long as you have drug coverage.
The trap here is the "I do not take any medications" reasoning. Skipping Part D while healthy saves a small premium now and risks a permanent surcharge later, usually when health has changed and the stakes are higher. The way to avoid it without buying a plan you do not need is to make sure whatever coverage you do have counts as creditable.
The 63-day Part D clock
3Part A: rarely an issue, but worth a line
Most people pay no premium for Part A because they earned it through their work history, and there is no penalty for delaying something that is free and that you can pick up at any time. The Part A penalty only applies to the small group who do not qualify for premium-free Part A and have to buy it; for them, late enrollment can add a surcharge for a limited period. For the large majority, this one simply does not come up.
4How to avoid all of them
The reassuring part is that these penalties are almost entirely avoidable, and not only by rushing to enroll at 65. Two paths keep you safe: enroll during your Initial Enrollment Period if you do not have other qualifying coverage, or hold qualifying coverage that protects your window, active employer coverage at a large employer protects your Part B window, and any drug coverage certified as "creditable" protects your Part D window. When that coverage ends, you get a Special Enrollment Period to pick up Medicare without penalty.
One practical habit ties it together: keep the paperwork. Employer and drug plans send notices stating whether coverage is creditable, and holding onto those notices is how you prove you were protected. The penalties punish gaps, not timing per se, so coverage plus proof is the real protection.
Common questions about Medicare
Quick answers to common questions
Tap any question to expand. Each question links to a fuller standalone answer.
How much does Medicare cost in 2026?
Medicare costs in 2026 depend on which parts you have, but here are the standard figures.
Part A (hospital coverage) is premium-free for most people who worked at least 40 quarters; using it carries an inpatient deductible of $1,736 per benefit period in 2026. Part B (doctor and outpatient coverage) has a standard premium, meaning a monthly amount you pay, of $202.90 in 2026, plus a yearly deductible of $283. Part D (prescription drug coverage) varies by plan, with a national base premium of $38.99 in 2026, deductibles up to $615, and a yearly out-of-pocket cap of $2,100. Higher earners pay more for Part B and Part D through IRMAA, an income-based surcharge. Your total depends on the parts and plans you choose.
Why did my Medicare premium go up?
Your Medicare premium can go up for a few common reasons.
First, the standard Part B premium, the monthly amount for doctor and outpatient coverage, is set each year and is $202.90 in 2026, so a yearly adjustment may be part of it. Second, your premium may have risen because of IRMAA, the Income-Related Monthly Adjustment Amount, an extra charge added when your reported income is above a certain level. In 2026, IRMAA begins for single filers with income above $109,000 and joint filers above $218,000. Because IRMAA uses tax information from a prior year, a higher-income year can raise your premium later. If you added Part D drug coverage or a new plan, that can change your total too.
What is IRMAA for Medicare?
IRMAA stands for Income-Related Monthly Adjustment Amount, an extra charge some people pay on top of their standard Medicare premiums.
It applies to Part B (doctor and outpatient coverage) and Part D (prescription drug coverage) when your reported income is above a set threshold. In 2026, IRMAA begins for single filers with income above $109,000 and for joint filers with income above $218,000. The amount added increases at higher income levels. IRMAA is based on your tax return from a prior year, so a higher-income year can affect your premiums later on. If your income has dropped due to a major life change, you can ask Social Security to reconsider. In short, IRMAA means higher earners pay more for the same coverage.
Is Medicare free at age 65?
No, Medicare is not free at age 65 for most people.
Many people pay no premium for Part A (hospital coverage) at 65 because they worked at least 40 quarters and paid Medicare taxes, but that does not make all of Medicare free. Part B (doctor and outpatient coverage) has a standard premium, the monthly amount you pay, of $202.90 in 2026, along with a yearly deductible of $283. If you add Part D for prescription drugs, that has its own cost too. Even premium-free Part A has a $1,736 inpatient deductible per benefit period in 2026 when you use it. So turning 65 does not mean coverage with no cost; most people pay monthly premiums and out-of-pocket amounts.
What is IRMAA?
IRMAA stands for Income-Related Monthly Adjustment Amount, an extra charge added to your Part B (medical) and Part D (drug) premiums if your income is above a set level.
Most people pay only the standard premiums, but higher earners pay the standard amount plus the IRMAA surcharge. The surcharge is based on your tax return from two years earlier, so your 2026 IRMAA is based on your 2024 income. The first income tier begins above $109,000 for a single filer and above $218,000 for a married couple filing jointly in 2026. If your income later drops or a life event changed it, you can ask Social Security to review your case. To understand how IRMAA might affect your premiums, reach out to a licensed Goodsurance advisor at 1-888-301-8091 (TTY 711), Mon to Fri 8 am to 5 pm PT.
What income triggers IRMAA?
IRMAA, the Income-Related Monthly Adjustment Amount, is triggered when your income rises above the first tier: more than $109,000 for a single filer or more than $218,000 for a married couple filing jointly in 2026.
Below those amounts, you pay only the standard Part B and Part D premiums with no surcharge. The income used is your modified adjusted gross income from your tax return two years earlier, so 2026 IRMAA is based on your 2024 income. There are several higher tiers above the first one, and the surcharge grows as income rises. Because it uses a two-year lookback, a year with a one-time income spike, like selling a home, can affect you later. To see how your income lines up, reach out to a licensed Goodsurance advisor at 1-888-301-8091 (TTY 711), Mon to Fri 8 am to 5 pm PT.
How do I appeal IRMAA?
You appeal IRMAA, the Income-Related Monthly Adjustment Amount, by asking Social Security to reconsider the income they used.
Because IRMAA is based on your tax return from two years earlier, the figure can be outdated if your income has dropped. You can request a new decision if you had a qualifying life-changing event, such as marriage, divorce, the death of a spouse, retirement, or a reduction in work hours, that lowered your income. You file a form with Social Security explaining the change and provide documentation, like a tax return or proof of the event. If approved, your surcharge is recalculated using your more current, lower income. There are deadlines, so acting promptly helps. To understand whether your situation qualifies for an appeal, reach out to a licensed Goodsurance advisor at 1-888-301-8091 (TTY 711), Mon to Fri 8 am to 5 pm PT.
Does IRMAA use last year's income?
No, IRMAA does not use last year's income; it uses your income from two years earlier.
IRMAA, the Income-Related Monthly Adjustment Amount, is a surcharge on Part B and Part D premiums for higher earners, and Social Security calculates it using your most recent tax return on file, which is generally from two years back. That means your 2026 IRMAA is based on your 2024 income. This two-year lookback is why a one-time income event, such as selling property or a large withdrawal, can raise your premium a couple of years later. If your income has since dropped because of a life-changing event, you can ask Social Security to use more current figures. To understand the timing for your situation, reach out to a licensed Goodsurance advisor at 1-888-301-8091 (TTY 711), Mon to Fri 8 am to 5 pm PT.
References
- Medicare.govThe Part A, Part B, and Part D late enrollment penalties.
- CMS, Centers for Medicare & Medicaid ServicesCreditable coverage and Special Enrollment Periods. cms.gov