The 2026 Medicare late enrollment penalties are three separate premium surcharges, one each for Part A, Part B, and Part D, and only the Part A penalty ever ends. Part B adds 10 percent of the standard premium for each full 12 month period you delayed, for life. Part D adds 1 percent of the national base premium per uncovered month. Part A adds a flat 10 percent for a limited time.
The 2026 Medicare late enrollment penalties attach automatically when you enroll after a window closes without qualifying coverage. Part B adds 10 percent of the $202.90 standard premium per full 12 month delay, for life. Part D adds 1 percent of the $38.99 base premium per uncovered month, for life. Part A adds a flat 10 percent, paid for twice the years delayed, then it ends.
What are the 2026 Medicare late enrollment penalties (at a glance)?
The 2026 Medicare late enrollment penalties differ on rate, base amount, and duration. Part B costs 10 percent of $202.90 per full year delayed, for life. Part D costs 1 percent of $38.99 per uncovered month, recalculated yearly, for life. Part A costs a flat 10 percent of the $311 or $565 premium, paid for twice the years delayed, then ending.
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These are premium surcharges written into federal law (42 U.S.C. 1395r) and regulation (42 CFR 423.46), each measured from the moment an enrollment window ends. The base figures below are Tier 1 primary (Source: CMS 2026 Parts A and B fact sheet, November 14, 2025; CMS 2026 Part D Bid Information fact sheet, July 28, 2025).
- Part B standard monthly premium: $202.90, up from $185.00 in 2025.
- Part D national base beneficiary premium: $38.99 per month, about 6 percent above the 2025 figure of $36.78.
- Part A full monthly premium: $565 (fewer than 30 work quarters) or $311 (30 to 39 quarters); about 99 percent pay no Part A premium.
- Part D penalty trigger: a gap of 63 days or more without creditable drug coverage.
| Feature | Part A | Part B | Part D |
|---|---|---|---|
| Rate | Flat 10% regardless of delay length | 10% per full 12 month period | 1% per full uncovered month |
| Base amount (2026) | $565 or $311 monthly premium | $202.90 standard premium | $38.99 base beneficiary premium |
| Duration | Twice the years of delay, then ends | Generally for life | Generally for life |
| Recalculated yearly? | Fixed while it applies | Moves with the standard premium | Yes, with the base beneficiary premium |
| Who is affected | About 1% who must buy Part A | Nearly all Part B enrollees who delay | Enrollees with a 63 day plus gap |
Sources: Medicare.gov, “Avoid late enrollment penalties”; 42 U.S.C. 1395r; 42 CFR 423.46; CMS 2026 fact sheets.
Why does enrollment timing decide your penalty?
Enrollment timing decides your penalty because each late enrollment surcharge is measured from the day an enrollment window closes. Medicare has three windows: the seven month Initial Enrollment Period, the General Enrollment Period of January 1 to March 31, and the eight month Special Enrollment Period for people who keep working. Missing your window without qualifying coverage is what triggers the penalty.
The Initial Enrollment Period (IEP) runs seven months: the three months before the month you turn 65, the birthday month, and the three months after. The General Enrollment Period (GEP) runs every year from January 1 through March 31, for people who missed their IEP, with coverage starting the first day of the month after enrollment (Source: Medicare.gov, “When can I sign up for Medicare?”, 2026).
The Special Enrollment Period (SEP) is how many people avoid a Part B penalty entirely. If you work past 65 with employer group health coverage based on current employment, the Part B SEP runs eight months, starting when the employment ends or the group coverage ends, whichever comes first (Source: Medicare.gov, “Working past 65”, 2026). One common trap: electing COBRA does not extend the SEP, because the eight month clock starts even if you take COBRA or other non-Medicare coverage. Retirement income planning, such as the timing of a Roth conversion strategy, is a separate question from these enrollment windows, but both belong on the same pre-65 checklist.
How is the Part B late enrollment penalty calculated in 2026?
The 2026 Part B late enrollment penalty adds 10 percent of the standard $202.90 premium for each full 12 month period you could have had Part B but did not enroll. Only full 12 month periods count, so the percentage is always a multiple of 10. The final premium is rounded to the nearest 10 cents, and it is figured on the standard premium, without regard to any income adjustment.
The statute is explicit. Under 42 U.S.C. 1395r(b), the premium “shall be increased by 10 percent of the monthly premium so determined for each full 12 months” you could have been enrolled but were not. Three details govern accuracy. First, only full 12 month periods count, so an 18 month delay is one period (10 percent), not 15 percent. Second, 42 U.S.C. 1395r(c) rounds the final penalty inclusive premium to the nearest 10 cents. Third, the penalty is figured “without regard to any adjustment under subsection (i),” so income related monthly adjustment amounts (IRMAA) are excluded from the penalty base.
That IRMAA exclusion is a point most competitors miss. The late enrollment penalty ignores your income, but Medicare has a separate income surcharge that does respond to modified adjusted gross income on a two year lookback. Managing that income, including how much to convert to Roth and the net investment income tax, is where retirement tax planning and Medicare costs meet.
How much does a Part B delay actually cost?
A one year Part B delay adds 10 percent, raising the 2026 premium from $202.90 to $223.20 per month. A five year delay adds 50 percent ($304.40). A seven year delay adds 70 percent, which after statutory rounding is $344.90 per month, not the un-rounded $344.93 that circulates in many write-ups. The correct figure follows the 10 cent rounding in 42 U.S.C. 1395r(c).
| Delay before enrolling | Penalty percentage | Total premium per month | Added per month | Added per year |
|---|---|---|---|---|
| 1 full year | 10% | $223.20 | $20.30 | $243.60 |
| 2 full years | 20% | $243.50 | $40.60 | $487.20 |
| 3 full years | 30% | $263.80 | $60.90 | $730.80 |
| 5 full years | 50% | $304.40 | $101.50 | $1,218.00 |
| 7 full years | 70% | $344.90 | $142.00 | $1,704.00 |
| 10 full years | 100% | $405.80 | $202.90 | $2,434.80 |
The two year, 20 percent case at $243.50 matches Medicare.gov’s own worked example applied to the 2026 base.
How much does the Part B penalty add over a lifetime?
Because the Part B penalty generally lasts as long as you keep Part B, the annual surcharge repeats. Holding the 2026 base constant, a two year delay adds about $487 a year, or roughly $9,744 across 20 years. A five year delay adds about $1,218 a year, or roughly $24,360 across 20 years. These are arithmetic illustrations, not projections.
| Delay | Added per month | Over 10 years | Over 20 years | Over 25 years |
|---|---|---|---|---|
| 1 year | $20.30 | $2,436 | $4,872 | $6,090 |
| 2 years | $40.60 | $4,872 | $9,744 | $12,180 |
| 5 years | $101.50 | $12,180 | $24,360 | $30,450 |
| 10 years | $202.90 | $24,348 | $48,696 | $60,870 |
The Part B standard premium rises in most years, so the true dollar cost of a delay would generally exceed these constant 2026 illustrations.
How is the Part D late enrollment penalty calculated in 2026?
The 2026 Part D late enrollment penalty equals 1 percent of the $38.99 national base beneficiary premium multiplied by the number of full uncovered months you were eligible for Medicare drug coverage but had none. The result is rounded to the nearest $0.10 and added to your monthly premium, generally for life. Because the base premium changes yearly, the dollar penalty is recalculated each year.
For 2026 the national base beneficiary premium is $38.99 per month, about 6 percent above the 2025 figure of $36.78 (Source: CMS 2026 Part D Bid Information fact sheet, July 28, 2025). The percentage stays locked to the number of uncovered months, but the dollar amount moves with the base premium each year, which sets Part D apart from Part B.
| Full uncovered months | Penalty percentage | Added per month | Added per year |
|---|---|---|---|
| 12 (1 year) | 12% | $4.70 | $56.40 |
| 14 | 14% | $5.50 | $66.00 |
| 24 (2 years) | 24% | $9.40 | $112.80 |
| 43 | 43% | $16.80 | $201.60 |
| 60 (5 years) | 60% | $23.40 | $280.80 |
| 120 (10 years) | 120% | $46.80 | $561.60 |
What triggers the Part D penalty?
The Part D penalty triggers when you go 63 days or more in a row, at any time after your Part D Initial Enrollment Period, without Part D or other creditable prescription drug coverage. This 63 day gap rule is set in 42 CFR 423.46. Staying continuously covered, even by qualifying employer or retiree drug coverage, keeps the clock from ever starting.
Under 42 CFR 423.46, the penalty applies when a continuous period of 63 days or more passes, after your Part D Initial Enrollment Period, during which you were eligible for a Part D plan but had no creditable drug coverage. A beneficiary who disputes a penalty may request reconsideration through an Independent Review Entity contracted by CMS.
What counts as creditable prescription drug coverage?
Creditable prescription drug coverage is coverage expected to pay, on average, at least as much as Medicare’s standard Part D benefit. It includes qualifying employer or union group plans, retiree plans, VA and TRICARE and other military coverage, qualified State Pharmaceutical Assistance Programs, and certain Medigap drug coverage. People who receive Extra Help, the low income subsidy, do not pay the Part D late enrollment penalty at all.
Because the Extra Help subsidy exempts a beneficiary from the Part D penalty entirely, confirming eligibility for that low income program is a valuable check for lower income enrollees (Source: Medicare.gov, “Creditable prescription drug coverage”, 2026).
How is the Part A late enrollment penalty different?
The Part A late enrollment penalty is a flat 10 percent, not a per year figure, and it is not permanent. You pay the higher premium for twice the number of years you delayed, then it ends. It affects only the roughly 1 percent of beneficiaries who must buy Part A, since about 99 percent qualify for premium free Part A through their own or a spouse’s work record.
About 99 percent of beneficiaries pay no Part A premium, because they or a spouse have at least 40 quarters (10 years) of Medicare covered employment (Source: CMS 2026 Parts A and B fact sheet). For those who must buy Part A and delay, the premium may rise 10 percent, paid for twice the years delayed: someone eligible for two years who did not sign up pays the higher premium for four years. The 2026 premiums are $565 (fewer than 30 quarters) and $311 (30 to 39 quarters).
| Premium tier | Surcharge per month (10%) | Delay 1 year, pay 2 years | Delay 2 years, pay 4 years | Delay 3 years, pay 6 years |
|---|---|---|---|---|
| Full premium ($565) | $56.50 | $1,356.00 | $2,712.00 | $4,068.00 |
| Reduced premium ($311) | $31.10 | $746.40 | $1,492.80 | $2,239.20 |
How do you avoid a Medicare late enrollment penalty?
You avoid a Medicare late enrollment penalty by enrolling during your seven month Initial Enrollment Period, or by using a Special Enrollment Period if you keep working past 65 with qualifying employer coverage. For drugs, keep creditable prescription drug coverage and never let a gap reach 63 days. When employer coverage ends, enroll before the eight month Part B SEP closes.
- Enroll during your Initial Enrollment Period, the seven months around your 65th birthday, unless you have qualifying employer coverage based on current work.
- If you keep working, enroll in Part B within the eight month Special Enrollment Period after the job or the employer group coverage ends, whichever comes first. Remember that COBRA does not extend this window.
- Keep creditable prescription drug coverage the whole time, and act before any gap reaches 63 days.
- Coordinate the timing with your broader retirement income plan. Decisions about a required minimum distribution and the Roth conversion deadline can raise the income that drives the separate IRMAA surcharge, even though they do not affect the late enrollment penalty itself.
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Frequently asked questions
How is the Medicare Part B late enrollment penalty calculated?
It is 10 percent of the standard premium for each full 12 month period you could have had Part B but did not enroll. In 2026 the standard premium is $202.90, so a two year delay adds 20 percent, or $40.60 per month. Only full 12 month periods count, and the final premium is rounded to the nearest 10 cents (42 U.S.C. 1395r).
Does the Medicare late enrollment penalty ever go away?
It depends on the part. The Part A penalty ends after you pay it for twice the number of years you delayed. The Part B and Part D penalties generally last for as long as you keep that coverage, so in most cases they do not go away (42 U.S.C. 1395r; 42 CFR 423.46).
How do I avoid the Medicare late enrollment penalty?
Enroll during your seven month Initial Enrollment Period, or use a Special Enrollment Period if you work past 65 with qualifying employer coverage. Keep creditable prescription drug coverage and never let a gap reach 63 days. Enroll in Part B within eight months of the job or group coverage ending, remembering that COBRA does not extend the Part B SEP.
How much is the Part D late enrollment penalty in 2026?
In 2026 the Part D penalty is 1 percent of the $38.99 national base beneficiary premium for each full uncovered month, rounded to the nearest $0.10. A 14 month gap adds about $5.50 per month; a 43 month gap adds about $16.80 per month. The amount is recalculated each year as the base premium changes (Source: CMS 2026 Part D Bid Information fact sheet).
Can the Medicare late enrollment penalty be waived or appealed?
Yes, in some situations. A Part D penalty may be reconsidered through an Independent Review Entity contracted by CMS, and people who receive Extra Help do not pay it at all. Part B relief is narrower, generally tied to equitable relief or SEP eligibility, and decided case by case (Source: 42 CFR 423.46; CMS, “Late Enrollment Penalty Appeals”).
How long do you have to pay the Medicare late enrollment penalty?
For Part B and Part D, you generally pay the penalty for as long as you keep that coverage, which for most people means for life. For Part A, you pay the flat 10 percent surcharge for twice the number of years you delayed enrollment, and then it ends (42 U.S.C. 1395r; Medicare.gov).
Sources
CMS, “2026 Medicare Parts A and B Premiums and Deductibles” fact sheet (released November 14, 2025), https://www.cms.gov/newsroom/fact-sheets/2026-medicare-parts-b-premiums-deductibles.
CMS, “2026 Medicare Part D Bid Information and Part D Premium Stabilization Demonstration Parameters” fact sheet (released July 28, 2025), https://www.cms.gov/newsroom/fact-sheets/2026-medicare-part-d-bid-information-and-part-d-premium-stabilization-demonstration-parameters.
CMS, “Creditable Coverage and Late Enrollment Penalty,” https://www.cms.gov/medicare/enrollment-renewal/part-d-plans/creditable-coverage-and-late-enrollment-penalty.
CMS, “Late Enrollment Penalty (LEP) Appeals,” https://www.cms.gov/medicare/appeals-grievances/prescription-drug/late-enrollment-penalty-appeals.
Medicare.gov, “When can I sign up for Medicare?” https://www.medicare.gov/basics/get-started-with-medicare/sign-up/when-can-i-sign-up-for-medicare.
Medicare.gov, “Working past 65,” https://www.medicare.gov/basics/get-started-with-medicare/medicare-basics/working-past-65.
Medicare.gov, “Avoid late enrollment penalties,” https://www.medicare.gov/basics/costs/medicare-costs/avoid-penalties.
Medicare.gov, “Medicare drug coverage (Part D) late enrollment penalty,” https://www.medicare.gov/drug-coverage-part-d/costs-for-medicare-drug-coverage/part-d-late-enrollment-penalty.
Medicare.gov, “Creditable prescription drug coverage,” https://www.medicare.gov/health-drug-plans/part-d/basics/creditable-coverage.
Cornell Legal Information Institute, 42 U.S.C. 1395r, https://www.law.cornell.edu/uscode/text/42/1395r.
Cornell Legal Information Institute, 42 CFR 423.46, https://www.law.cornell.edu/cfr/text/42/423.46.
About the author
Craig Wear, CFP®, is the founder of Q3 Advisors, a registered investment adviser focused on retirement tax planning. This briefing was prepared and reviewed by the Q3 Advisors team using primary sources, including CMS fact sheets, Medicare.gov guidance, and the underlying federal statute and regulation. All base dollar figures are drawn from Tier 1 federal sources for calendar year 2026, and all penalty calculations follow the cited statutory and regulatory formulas.
Disclaimer
This material is provided by Q3 Advisors, a registered investment adviser, for informational and educational purposes only. It is not investment, legal, or tax advice, nor a recommendation to buy or sell any security or to adopt any strategy. Information is believed to be from reliable sources as of the dates cited, but its accuracy is not guaranteed and figures are subject to change. Registration does not imply a certain level of skill or training. See Q3 Advisors’ Form ADV Part 2A and Part 2B for information on services, fees, and conflicts of interest. Readers should consult their own qualified tax, legal, or financial advisor before making any decisions.
