Waiting Two Years for Medicare Part B Turns a $202.90 Premium Into $243.50 a Month for Life
6 min read · Last updated August 22, 2026
- Every full 12-month period you go without Part B, when you didn’t have a Special Enrollment Period, adds a 10% penalty to your monthly premium.
- A 24-month delay turns the 2026 standard Part B premium of $202.90 into $243.50 a month, a 20% penalty.
- If you or your spouse had group health coverage through active employment when you turned 65, a Special Enrollment Period can let you sign up penalty-free.
- The penalty is not a one-time fee. It’s added to your premium for as long as you’re enrolled in Part B.
In this article
- How the Penalty Is Calculated
- The Worked Example: $202.90 to $243.50
- How to Avoid the Penalty
- Penalty by Delay Length
- What to Do If Your Penalty Looks Wrong
- What People Get Wrong
- Frequently Asked Questions
A retired shop foreman in Nevada kept working past 65, stayed on his employer’s group health plan, and assumed Medicare could wait. When that job ended two years later with no group coverage lined up and no Special Enrollment Period claimed in time, he signed up for Part B and found his monthly premium wasn’t the standard $202.90 rate. It was $243.50, and it will stay that way for as long as he carries Part B.
How the Penalty Is Calculated
Medicare’s rule is straightforward on paper: if you don’t sign up for Part B when you’re first eligible, and you don’t qualify for a Special Enrollment Period, your monthly premium may go up 10% for each full 12-month period you could have had Part B but didn’t. The penalty is based on full 12-month blocks of time, not partial months or odd stretches of a few weeks.
That 10% compounds with each additional year of delay. Someone who waited one full year without coverage and without a valid exception owes a 10% penalty. Someone who waited two full years owes 20%. The percentage keeps climbing for every additional 12-month period, and it’s calculated against whatever the standard Part B premium happens to be for that year, not the premium in effect when you were first eligible.
The Worked Example: From $202.90 to $243.50
Medicare.gov walks through this exact scenario, and it’s worth naming every input. Say someone waited 2 full years, 24 months, to sign up for Part B, and they didn’t qualify for a Special Enrollment Period during that time.
That’s two full 12-month periods, so the penalty is 10% times 2, or 20%. The 2026 Part B standard monthly premium is $202.90. Twenty percent of $202.90 is $40.58. Add that penalty to the base premium: $202.90 plus $40.58 equals $243.48, which rounds to $243.50 as the actual 2026 monthly premium with the penalty applied.
That $40.58 isn’t a one-time catch-up charge. It’s the new baseline added to the premium every single month, for as long as that person has Part B.
How to Avoid the Penalty
The most common way to avoid this penalty entirely is a Special Enrollment Period tied to employer coverage. If you, or your spouse, were still working and covered by a group health plan through that employer when you turned 65, you generally won’t owe a Part B penalty, as long as you sign up within the defined window after that employment or coverage ends. Retiree coverage, COBRA, and individual marketplace plans don’t count for this exception; it has to be active employment with a group health plan.
There’s a second path that doesn’t involve employment at all: if you qualify for a Medicare Savings Program, a state program that helps pay Medicare costs for people with limited income, you generally won’t owe a Part B penalty either. YRH has a separate, full breakdown of Medicare Savings Program eligibility if that’s the door that applies to your situation.
One more thing worth flagging while you’re thinking about enrollment timing: Medicare Part D also has a late enrollment penalty, but it’s calculated differently, as 1% of the national base beneficiary premium for each month you went without creditable drug coverage. That’s a separate calculation from everything above and deserves its own research if it applies to you.
Penalty by Delay Length
| Months without Part B (when you could have had it) | Penalty percentage | 2026 monthly premium with penalty |
|---|---|---|
| 12 months | 10% | $223.20 |
| 24 months | 20% | $243.50 |
| 36 months | 30% | $263.80 |
| 48 months | 40% | $284.10 |
What to Do If Your Penalty Looks Wrong
If you believe your Part B penalty was calculated incorrectly, or you think you qualified for a Special Enrollment Period that wasn’t applied, you don’t have to accept the number as final. Medicare’s own guidance is to contact Social Security or call 1-800-MEDICARE if you disagree with a penalty determination. Have your enrollment dates and any documentation of employer coverage ready, since the review will hinge on exactly when your group health coverage started and ended relative to when you signed up.
What People Get Wrong
The biggest misconception is treating the penalty as a one-time catch-up payment, something you pay off and move past. It isn’t. It rides on top of your premium every month for as long as you have Part B.
The second is assuming any health coverage counts toward a Special Enrollment Period. It has to be a group health plan tied to active employment, yours or your spouse’s, not retiree coverage, not COBRA, not a marketplace plan. The third is assuming the penalty gets prorated for partial years; it’s calculated in full 12-month blocks, so a delay of 13 months and a delay of 23 months both round up to two full periods once you cross that second year. And some people conflate the Part B penalty math with the Part D penalty math, when the two are calculated on entirely different bases.
Frequently asked questions
How much does the Medicare Part B penalty add to my premium? It adds 10% of the standard Part B premium for every full 12-month period you went without coverage and without a Special Enrollment Period. For example, a 24-month delay adds 20%, turning the 2026 standard premium of $202.90 into $243.50 a month.
Does the Part B penalty ever go away? No. Unlike a one-time late fee, the Part B penalty is added to your monthly premium for as long as you’re enrolled in Part B. It doesn’t expire after a set number of years or get forgiven once you’ve paid it for a while.
Who qualifies for a Special Enrollment Period that avoids the penalty? Most commonly, someone who was still working and covered by a group health plan through that employer when they turned 65. You generally must sign up within a defined window after that employment or coverage ends to avoid owing a penalty.
Is the Medicare Part D penalty calculated the same way as Part B? No. Part D’s late enrollment penalty is calculated as 1% of the national base beneficiary premium for each month you went without creditable drug coverage, which is a different formula from the 10%-per-12-month-period rule used for Part B.
