Medicare Part A Work Credits: How 40 Quarters and Premium-Free Part A Work

The basic rule

What Are Medicare Part A Work Credits?

Social Security uses quarters of coverage, commonly called Social Security or Medicare work credits, to determine whether a worker has enough covered work history for certain benefits. For premium-free Part A at age 65, the familiar benchmark is generally 40 credits.

2026 earnings threshold

How Do You Earn a Medicare Work Credit?

For 2026, you earn one Social Security and Medicare credit for each $1,890 of covered earnings, up to four credits for the year. That means $7,560 of covered earnings in 2026 is enough to earn the year’s maximum four credits.

The dollar amount required for one credit changes over time, so someone who worked decades ago did not need to earn today’s dollar amount for an older credit.

Premium-free eligibility

Do You Need 40 Credits of Your Own?

Not always. Medicare says Part A can be premium-free when you or a spouse paid Medicare taxes long enough while working. Social Security also recognizes some eligibility through a former or deceased spouse’s work record when its relationship requirements are met.

If you are unsure which record applies, Social Security—not an insurance company—makes the official Part A entitlement and premium determination.

If you have fewer credits

What If You Do Not Qualify for Premium-Free Part A?

Many people age 65 or older who do not qualify for premium-free Part A can buy it. The monthly premium depends on Medicare-covered work history.

For age-based Medicare, Medicare.gov states that if you need to buy Part A, you also have to enroll in Part B. A Part B premium applies separately.

Common confusion

Do Work Credits Change What Part A Covers?

No. Work credits primarily determine entitlement and premium status; they do not create a richer Part A benefit package. Having 42, 60 or 100 credits does not make Part A cover more hospital days than having 40 credits.

That distinction is why this page is separate from our Part A coverage and costs guide. This guide answers “Do I qualify for premium-free Part A, and what if I do not?” The other guide answers “What does Part A cover, and what can I owe when I use it?”

Planning before 65

What If You Are Close to 40 Credits?

If your Social Security record shows fewer than 40 credits, additional Medicare-covered work can add credits over time, up to four per year. Once new covered earnings are posted, Social Security can determine whether your Part A premium category has changed.

• Check your earnings history in your my Social Security account.
• Make sure years of covered employment are not missing from the record.
• If a spouse’s record may qualify you, ask Social Security which record will be used.
• If you expect to buy Part A, budget for Part B as well and verify your enrollment window.

Other Medicare paths

What If Medicare Starts Before Age 65?

Medicare before 65 can begin through disability entitlement, ALS or ESRD, and those pathways do not fit neatly into the ordinary age-65 “40 work credits for premium-free Part A” explanation. If that is your situation, start with Medicare Under 65: Disability, SSDI, ALS and ESRD.

Likewise, if you are still working past 65 and contribute to an HSA, do not use work credits alone to decide when to enroll. Premium-free Part A can affect HSA contribution eligibility, and delayed Part A enrollment can have retroactive effective-date consequences. See Medicare and HSA Rules.