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Medicare Part B Late Enrollment Penalty Calculator
Enter the months you have delayed Part B, or expect to delay, and see what the late penalty adds to your premium at the 2026 rate.
How Much Would A Part B Late Penalty Cost You?
Missing your Initial Enrollment Period triggers a permanent Part B late enrollment penalty. The penalty is 10% of the standard premium for every full 12 months you delayed, added to your premium for life. See what it could cost.
The penalty applies for as long as you have Part B. The 20-year estimate assumes the 2026 premium; actual premiums rise most years, so the real lifetime cost is likely higher.
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Adam will call you back within one business day. If it is after hours, the next business morning. No obligation.
Or call now: (785) 247-1314The number that comes back is what Social Security adds to your Part B premium every month. It is not a one-time fine, and it does not fall away after a few years. Below is the rule the calculator applies, the same arithmetic at four common delays, and the situations that stop the penalty applying at all. The rule below is the one Social Security applies, and the overview of Medicare help in Lawrence explains how a first call runs.
How The Part B Penalty Works
Social Security charges a late enrollment penalty when you take Part B after your Initial Enrollment Period closes with nothing creditable covering the gap. Three facts set the size of it.
- The charge is 10 percent of the standard Part B premium for each full 12 months you could have had Part B but did not, without creditable employer coverage behind you.
- It is added to what you pay every month, for as long as you have Part B.
- The 2026 standard premium is $202.90 a month, so one 10 percent step is worth $20.29 at today's rate.
Only whole years count, and partial ones are dropped. Eleven months late carries nothing. Twelve months carries 10 percent. A delay of 25 months still carries 20 percent, because the third full year has not finished.
The clock starts when your Initial Enrollment Period closes, not on your birthday. Months when you or your spouse were actively working count differently. If you were on that employer group health plan and the employer has 20 or more employees, those months do not count against you. Getting that timing right is the point of the Turning 65 guide for Lawrence, which lays the seven-month window out in order.
Worked Examples At The 2026 Premium
Every figure here is arithmetic on the 2026 standard premium of $202.90. Find your delay in the first column. The rest of the row is what the penalty adds on top of the premium everyone pays.
| Delay | Penalty | Added per month | Added per year | 20-year total |
|---|---|---|---|---|
| 12 months | 10 percent | $20.29 | $243.48 | $4,870 |
| 24 months | 20 percent | $40.58 | $486.96 | $9,739 |
| 36 months | 30 percent | $60.87 | $730.44 | $14,609 |
| 60 months | 50 percent | $101.45 | $1,217.40 | $24,348 |
Read that last column as a floor, not a forecast. It holds the premium at the 2026 level, and the standard premium has risen in most years. The penalty is a percentage of that premium, so it rises too.
Set the middle of the table against a retirement budget and it stops looking technical. Two years of delay is $40.58 leaving the account every month, on top of the premium, for as long as you keep the coverage. To see where this decision sits among the others, the Medicare plans overview takes Parts A, B, C and D in turn.
How To Avoid The Penalty
Three of the panels below are ways to stay clear of the penalty. The last is the coverage that looks like it ought to protect you and does not.
Delaying Part B is the first of the seven Medicare mistakes worth avoiding. The rest follow the same shape: a deadline that passes quietly and sends a bill years later.
A number on a screen is not a verdict. Adam will check whether one of these exceptions covers your months.
Call Adam (785) 247-1314 Request a callPart B Penalty Questions
How is the Part B late enrollment penalty calculated?
Count the full 12-month periods between the close of your Initial Enrollment Period and the month Part B starts, leaving out months covered by a creditable employer plan. Each complete period is worth 10 percent. A 26-month gap holds two, so the answer is 20 percent, not 21.7 percent.
How long do I pay the Part B penalty?
For as long as you hold Part B, which for most people means the rest of their life. Social Security locks the percentage when you enroll. It does not lock the dollar amount, which is recalculated against the standard premium every year.
What counts as creditable coverage for Part B?
A group health plan tied to current work, either your own job or one your spouse still holds, at an employer with 20 or more employees. Coverage that exists because a job ended fails the test. COBRA and retiree plans are real insurance and still do not count here.
Can the Part B penalty be removed or appealed?
Sometimes. If employer insurance covered those months, form CMS-L564 is how that employer confirms it to Social Security, and the penalty comes off. If a federal employee gave you wrong information and you acted on it, equitable relief is the route. Adam can help you work out which one applies.
Is there also a Part D late enrollment penalty?
Yes, and it is built differently. A gap of 63 days or more without creditable drug coverage is what triggers it. Once it is triggered, the charge is 1 percent of the national base beneficiary premium for every full month you went uncovered after your Initial Enrollment Period ended, and it lasts for life too. Both can land on the same person.
Does the penalty apply if I delay Part A?
For most people, no. Part A costs nothing if you or your spouse worked 40 quarters, and there is no penalty on coverage you do not pay for. If you have fewer than 40 quarters and buy Part A, a 10 percent penalty can apply for twice the number of years you delayed.
Not sure if the penalty applies to you?
Adam can check whether an exception fits your situation. No charge.
Call (785) 247-1314 Or request a callback