If you teach for a public school and were hired after March 31, 1986, your wages are Medicare-qualified. Federal law requires Medicare tax withholding from your paycheck, and each year of teaching builds credits toward premium-free Part A at 65. Teachers hired before April 1986 sit in a gray zone: coverage depends on whether the employer voluntarily opted in, whether the teacher voted into coverage in an old referendum, and whether employment has been continuous since then.
The 1986 Rule
Under 26 U.S.C. § 3121(u), all state and local government employees are subject to Medicare’s Hospital Insurance tax unless a narrow exception applies.1Office of the Law Revision Counsel. 26 USC 3121 Definitions For anyone hired into a public teaching job after March 31, 1986, that settles the question. Medicare tax has been withheld from day one, and every year of covered work earns credits toward premium-free Part A.
You need 40 credits, which works out to about 10 years of Medicare-covered work. In 2026, one credit is earned for every $1,890 in wages subject to Medicare tax, up to four credits per year.2Social Security Administration. 2026 Cost-of-Living Adjustment (COLA) Fact Sheet
The exceptions to the 1986 mandate are unlikely to reach a classroom teacher. They cover situations like temporary emergency workers, election officials earning below a threshold, and certain student employees of District of Columbia hospitals.1Office of the Law Revision Counsel. 26 USC 3121 Definitions
Teachers Hired Before April 1, 1986
The statute carves out a continuing-employment exception. If a teacher was performing regular service for the same employer before April 1, 1986, was a bona fide employee on March 31, 1986, and has stayed with that employer continuously since then, the wages are not required to be subject to Medicare tax.1Office of the Law Revision Counsel. 26 USC 3121 Definitions Very few teachers still meet all three conditions in 2026, since it takes nearly 40 years of unbroken service with one employer, but some veteran educators near retirement do.
Even before 1986, some states and local governments brought their employees under Social Security and Medicare voluntarily through Section 218 agreements. These are contracts between a state and the Social Security Administration that extend coverage to groups of public employees, and they required a referendum. Some referendums used a majority-vote process, where a yes vote covered everyone in the group. Others were divided votes, where only employees who voted yes were covered, and those who voted no remained exempt so long as they stayed in the same retirement system.3Social Security Administration. Section 218 Agreements
That is why two veteran teachers at the same school, both hired before 1986, can have different Medicare status. One voted yes decades ago and has credits. The other voted no and has none from teaching.
Medicare-Only Coverage in Pension States
In roughly 15 states, public school teachers pay Medicare tax but not Social Security tax. These teachers have what is sometimes called Medicare-only or Medicare HI-only coverage. Their wages still count toward the 40 credits needed for premium-free Part A, but they will not receive Social Security retirement benefits based on those earnings. This arrangement is common in states like California, Texas, Ohio, Illinois, and Massachusetts.
The pension arrangement affects retirement income, not Medicare eligibility. Ten years of Medicare-only teaching wages fully qualifies you for premium-free Part A at 65, the same as any other worker paying Medicare tax.
How to Check Your Own Wages
Look at your W-2. Box 5 shows wages subject to Medicare tax, and Box 6 shows the Medicare tax withheld.4Internal Revenue Service. W-2, Wage and Tax Statement If both boxes carry dollar amounts, your wages are Medicare-qualified. If they are blank or zero, no Medicare tax is coming out of your pay. A recent pay stub should also show Medicare tax as its own line-item deduction.
For the full picture, pull your Social Security Statement from the SSA. It lists your earnings history and the credits you have accumulated.5Social Security Administration. Review Record of Earnings You can view it through your my Social Security account or request a paper copy using Form SSA-7004.6Social Security Administration. Request for Social Security Statement
Do this well before retirement. If an employer failed to withhold Medicare tax for a period, sorting it out years later is difficult. Teachers within five to ten years of retiring should verify their credit count while there is still time to close any gap through additional covered work.
If You Don’t Have Enough Credits
A teacher whose wages were never Medicare-qualified, or who fell short of 40 credits, can still get Part A by paying a monthly premium. The 2026 amounts:7Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles
- 40 or more credits: $0 (premium-free Part A)
- 30 to 39 credits: $311 per month
- Fewer than 30 credits: $565 per month
Part B is separate and applies to everyone regardless of work history. The standard Part B premium in 2026 is $202.90 per month, and the Part A inpatient hospital deductible is $1,736 per benefit period.7Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles
Two other paths get you to premium-free Part A. If your spouse has 40 or more credits of Medicare-covered employment, you can qualify on their record at 65.8HHS.gov. Who’s Eligible for Medicare? Prior private-sector work also counts. Seven years in a covered private job before you switched into teaching means you only need three more years of Medicare-covered wages to reach 40 credits.
Enrollment Timing Once You Do Qualify
Credits get you eligibility. Enrollment is a separate step. The Initial Enrollment Period runs seven months: the three months before you turn 65, your birthday month, and the three months after.9Medicare. When Can I Sign Up for Medicare?
Many teachers keep working past 65 under the district’s group health plan. In that case, you do not have to enroll at 65. When employer coverage ends, you get an eight-month Special Enrollment Period to sign up for Part B without penalty, running from the month the employer coverage or employment ends, whichever comes first.
Two things catch teachers off guard. Retiree health insurance and COBRA are not treated as coverage from current employment, so retiring at 66 and living on COBRA for 18 months will burn through the Special Enrollment Period before the COBRA does. And if you go more than eight consecutive months without either Part B or employer group coverage after turning 65, you lose the Special Enrollment Period and have to wait for the General Enrollment Period in January through March, with coverage not starting until July.