Medicare Late Enrollment Penalties in 2026 — Part B Lasts for Life, Part A Does Not
Part B adds 10% per full 12-month delay and is usually charged for life. Part A lasts only twice the years you delayed. Part D adds 1% a month. Standard Part B premium is $202.90 in 2026.
★The three penalties do not work the same way
People often assume one Medicare late-enrollment rule covers everything. ★**Each part is calculated differently, and only one of them is charged for life in the usual case.**[1]
★**Part B** — an extra **10% for each year** you could have signed up but didn't, and it is **usually charged for as long as you have the coverage**. ★**Part A** — the premium **may go up 10%**, but it lasts only **twice the number of years you didn't sign up**, so it does end. ★**Part D** — an extra **1% for each month** (12% a year), added **for as long as you have Medicare drug coverage, even if you switch plans**.[1]
★Part B counts only whole years — partial ones don't add up
★The Part B penalty is applied per **full 12-month period**. Waiting 23 months is not 'almost two years' of penalty — **it is one full period, so 10%**, not 20%. The count is of complete 12-month blocks you went without Part B when you could have had it.[2]
★And because the penalty is a **percentage of the standard premium**, it **rises when the premium rises**. The standard Part B premium is **$202.90 in 2026**, so a 20% penalty is not a fixed dollar amount — it grows with the premium each year.[1][2]
★Delay is not automatically a penalty
★Having waited does **not** by itself mean you owe a penalty. A **Special Enrollment Period** can exempt you from the Part B penalty — this is the situation for many people who stayed on employer coverage past 65.[2]
★For Part D the test is **creditable coverage**: the penalty applies if you go **63 or more days without it**. Prior drug coverage that meets Medicare's standard — an employer plan or VA coverage, for instance — **prevents the penalty**. So the question is not only *how long you waited* but *what you had while waiting*.[1][2]
Verified facts
Cross-checked against 2+ independent sourcesThis section contains facts cross-checked against multiple sources.
Medicare.gov states the Part B late enrollment penalty adds an extra 10% for each year you could have signed up for Part B but did not.[1][2] 2 sources
Late enrollment penalties are usually charged for as long as you have that type of coverage, which for most people means a lifetime penalty for Part B.[1][2] 2 sources
The Part A late enrollment penalty raises the monthly premium by 10% but lasts for twice the number of years you did not sign up, unlike Part B.[1][2] 2 sources
The Part D late enrollment penalty adds 1% for each month, which is 12% a year, and applies if you go 63 or more days without creditable coverage.[1][2] 2 sources
The standard Part B premium is $202.90 in 2026, and the Part D national base beneficiary premium is $38.99 in 2026.[1][2] 2 sources
Only full 12-month periods count toward the Part B penalty, and a Special Enrollment Period can exempt someone from it.[1][2] 2 sources
Timeline
- 2026-03-26
NCOA publishes its explainer citing the 2026 Part B premium of $202.90 and Part D base of $38.99.[2]
- Model
- claude-opus-5
- Time
- 09/08/2026, 21:20
- Tokens
- 9,000
- Sources
- 2 sources adopted
- Model
- claude-opus-5 (medicare.gov official page and NCOA checked against each other)
- Time
- 09/08/2026, 21:20
- Tokens
- 9,000
- Verdict
- Passed
Show revision history (2)
| 09/08/2026, 09:00 | First authored (claude-opus-5) | Created |
| 09/08/2026 | New document. The three parts use different penalty rules and only Part B is usually lifetime, which most summaries blur together; built from Medicare.gov and NCOA. | Updated |
Frequently asked
How is the Medicare Part B late enrollment penalty calculated?
It adds 10% to the standard Part B premium for each full 12-month period you could have had Part B but didn't. Only complete 12-month periods count, so 23 months of delay is one period, not two.[1][2]
Does the Part B penalty ever go away?
Usually not. Medicare.gov says late enrollment penalties are charged for as long as you have that coverage, which for most people means a lifetime penalty for Part B.[1]
Is the Part A penalty also for life?
No. The Part A penalty raises the premium 10% but lasts only twice the number of years you did not sign up, so unlike Part B it ends.[1]
How is the Part D penalty different?
Part D adds 1% per month, or 12% a year, and is based on the national base beneficiary premium, which is $38.99 in 2026. It applies after 63 or more days without creditable drug coverage and continues even if you change plans.[1][2]
I delayed because I had job coverage. Do I still owe a penalty?
Not necessarily. A Special Enrollment Period can exempt you from the Part B penalty, and for Part D, prior creditable coverage such as an employer or VA plan prevents the penalty.[2]