Almost everyone gets Medicare Part A for free. Not everyone. If you or your spouse did not work enough quarters to earn it, you can still buy Part A, but you pay a monthly premium. Wait too long to sign up and Medicare tacks on a late penalty. This is one of the quieter Medicare rules, and it catches immigrants, homemakers, and self-employed folks who never paid FICA taxes.
The short answer
If you have to buy Medicare Part A and you sign up after your first enrollment window, your monthly premium goes up 10%. You pay that higher rate for twice the number of years you waited. Wait 3 years, pay the penalty for 6 years.
The good news: unlike the Part B penalty (which lasts for life), the Part A penalty is temporary. It eventually goes away.
First, do you even have to pay for Part A?
About 99% of Americans get Part A with no premium. You qualify for free Part A if you or your spouse:
- Worked and paid Medicare taxes for at least 40 quarters (about 10 years)
- Are receiving Social Security or Railroad Retirement
- Are the widow or divorced ex-spouse of someone who worked 40 quarters
- Have certain disabilities and qualified for Social Security Disability
Free Part A means no premium ever, no late penalty ever. You are done.
If none of the above applies to you, you might still be able to buy Part A. That is when the penalty rules matter.
Who has to pay for Part A?
You might have to buy Part A if you fall into one of these groups:
- You immigrated to the US later in life and did not work here long enough
- You spent most of your career as a homemaker without a spouse who paid Medicare tax
- You worked in a job that did not pay Medicare tax, like some state or local government positions before 1986
- You were self-employed and did not pay self-employment tax
- You are married to someone in one of these situations
The 2026 Part A premium if you have to buy it
There are two rates for people buying Part A. The one you get depends on how many quarters of Medicare-taxed work you or your spouse have on record.
| Quarters of Medicare-Taxed Work | 2026 Monthly Premium |
|---|---|
| 40 or more | Free |
| 30 to 39 | Reduced premium (check current CMS rates) |
| Fewer than 30 | Full premium (check current CMS rates) |
The exact 2026 dollar amounts are published each fall at Medicare.gov's cost page. Historically the reduced rate is about half of the full rate.
How the Part A penalty math works
Here is the rule spelled out:
- Your monthly premium goes up by 10%.
- You pay that higher premium for TWICE the number of full years you could have had Part A but did not sign up.
Example. Say the full Part A premium is $500 a month. You could have signed up at 65 but you waited until 68. That is 3 full years late.
- Your penalty premium: $500 + 10% = $550 a month
- You pay $550 for 3 years x 2 = 6 years
- After 6 years, your premium drops back to whatever the regular rate is at that time
Extra cost over 6 years: $50 x 12 x 6 = $3,600.
How Part A penalty compares to Part B and Part D
The three Medicare late-enrollment penalties look similar but behave differently. Here is the side-by-side:
| Program | Penalty Amount | How Long |
|---|---|---|
| Part A | 10% flat | 2x years you were late (then ends) |
| Part B | 10% for each 12 months late | For the rest of your life |
| Part D | 1% x months late x base beneficiary premium | For the rest of your life |
Part B and Part D never end. Part A does. That is one small mercy in the rulebook.
How to avoid the Part A penalty
The safest way is to enroll during your Initial Enrollment Period. That is the 7 month window: the 3 months before your 65th birthday month, your birthday month, and the 3 months after.
If you miss that window, your next chance is the General Enrollment Period from January 1 to March 31 each year. Coverage starts the first day of the month after you enroll. That is when the penalty math starts.
There is also a Special Enrollment Period (SEP) for people who had employer coverage past 65. If you had qualified employer group health insurance and you enroll within 8 months of losing that coverage, no penalty applies. This is the escape hatch most people use.
Read our full breakdown at Still Working at 65? How Medicare Works With Employer Insurance.
Buying Part A while working past 65
If you are still working and have employer coverage, you can delay Part A without penalty as long as your employer plan is considered "creditable coverage" and the employer has 20 or more employees. Once you lose that coverage, the 8 month SEP starts. Sign up during that window and there is no penalty.
People who work at small employers (under 20 employees) usually have to enroll in Medicare at 65. Their group plan is secondary to Medicare, so waiting means going without primary coverage.
Special situations to know
Immigrants who become citizens or permanent residents
Many people who move to the US later in life do not have enough US work quarters. You can buy Part A only if you are a US citizen OR a lawful permanent resident who has lived in the US continuously for at least 5 years. If you meet that rule, you enroll like any other buyer, and the penalty math applies.
Spouses of workers
You can qualify for premium-free Part A on your spouse's work record if:
- You are at least 62 and your spouse is at least 65
- Your spouse has 40 quarters of Medicare-taxed work
- You are married, divorced (after 10+ years of marriage), or widowed
If your spouse turns 65 after you do, you may need to buy Part A temporarily and switch to free Part A once they qualify.
Divorced spouses
If you were married for at least 10 years to someone with 40 quarters, and you are not remarried, you can use their work record even after divorce. Many people do not realize this.
Real example: Marta
Marta moved to the US at 60. She never worked in the US. Her husband worked full time and paid Medicare tax for 42 quarters. When Marta turned 65, she qualified for FREE Part A on her husband's record. No premium, no penalty risk.
Compare to Elena. Elena moved to the US at 60, never worked here, and is single. At 65 she wanted to buy Part A. She waited 4 years, until age 69, thinking she was healthy enough to skip it. When she finally enrolled, the penalty math ran:
- Premium: full rate + 10%
- Duration: 4 years late means 8 years of penalty payments
- She locks in that higher payment until age 77
If Elena had signed up at 65 or gotten a citizenship-based SEP, she would have avoided all of it.
What happens when the penalty ends
Once your penalty period ends, your premium drops. Your standard Part A premium becomes whatever the current-year regular rate is. You do not have to do anything. Medicare tracks the date automatically.
If you die before the penalty period ends, the penalty ends with you. It does not transfer to a spouse.
Common mistakes
Assuming free Part A is automatic
Most people get it free, but not everyone. If neither you nor your spouse worked 40 quarters, you need to check. Ask Social Security for your work record early, before age 65.
Delaying "just for now"
You save on the premium in the short term but lock in a higher premium later. Buying Part A late almost always costs more than buying it on time.
Confusing Part A with Part B
Part B has a lifetime penalty. Part A does not. Do not use one rule to make decisions about the other.
Missing the SEP after employer coverage ends
You have 8 months from the date your employer coverage ends to enroll penalty-free. Miss it and the penalty math starts. See what happens if you miss Medicare enrollment.
The bottom line
The Part A late enrollment penalty is a smaller deal than most people think, because it only applies to the 1% of people who have to buy Part A. And unlike Part B and Part D, it has an end date.
Still, the math adds up. A 10% surcharge across 6, 8, or 10 years of premiums can hit $5,000 or more. If you fall into the small group that has to buy Part A, enroll during your Initial Enrollment Period or a valid SEP. Do not let the penalty stack up.
Not sure whether you qualify for free Part A? A quick call to Social Security can tell you. Or book a free 20 minute call with me and we will walk your enrollment plan step by step. See related reading on how much Medicare costs in 2026 or the Special Enrollment Periods that can save you the penalty.
Frequently asked questions
Who has to pay a premium for Medicare Part A?
People who did not work 40 quarters of Medicare-taxed employment and whose spouse did not either. About 1% of people over 65. Check with Social Security to see your quarters.
What is the Medicare Part A late enrollment penalty?
A 10% premium surcharge. You pay it for twice the number of full years you delayed enrollment. Wait 3 years, pay the penalty for 6.
How long does the Part A penalty last?
Twice the years you delayed, then it ends. This is different from Part B and Part D penalties, which last for life.
How do I avoid the Part A late enrollment penalty?
Enroll during your Initial Enrollment Period (7 months around your 65th birthday) or a valid Special Enrollment Period after losing employer coverage.
Does the Part A penalty apply to people with premium-free Part A?
No. If you get Part A free because of your work record or your spouse's, there is no late enrollment penalty. Ever.