What Are 40 Quarters? Calculation, Social Security, And Medicare
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Medically reviewed by Oluwatoyin Kuloyo, Pharm.D., BCPS — Written by MaryAnn De Pietro, CRT — Updated on May 21, 2025- Overview
- Calculation
- Qualifying earnings
- Disabilities
- Other eligibility
- Helpful options
- Summary
A quarter is a 3-month period, and 1 year has 4 quarters in it. When a person has worked and paid taxes for 40 quarters during their life, they may be entitled to premium-free Medicare Part A.
Part A is just one part of Medicare, the federal health insurance program for adults ages 65 years and over as well as younger adults with qualifying disabilities.
Medicare Part A is free for many adults based on how many qualifying quarters they have worked in their lifetime.
This article will look at what it means to have worked 40 quarters, how this may affect premiums, and other eligibility and qualification details.
Glossary of Medicare terms
- Out-of-pocket cost: This is the amount a person must pay for care when Medicare does not pay the total amount or offer coverage. Costs can include deductibles, coinsurance, copayments, and premiums.
- Premium: This is the amount of money someone pays each month for Medicare coverage.
- Deductible: This is an annual amount a person must spend out of pocket within a certain period before Medicare starts to fund their treatments.
- Coinsurance: This is the percentage of treatment costs that a person must self-fund. For Medicare Part B, coinsurance is 20%.
- Copayment: This is a fixed dollar amount a person with insurance pays when receiving certain treatments. For Medicare, this usually applies to prescription drugs.
What are 40 quarters of work?
Share on PinterestMedicare bases the cost of Part A premiums on the number of quarters that a person worked and paid Medicare taxes before receiving Medicare.
Qualifying quarters worked are also called credits. This means for each quarter that a person worked, they earned a credit. To qualify for premium-free Medicare Part A, an individual must have worked 40 quarters in their lifetime.
How long is 40 quarters?
According to Medicare, 40 quarters of work is generally equal to at least 10 years of working and paying Medicare taxes.
The Social Security Administration (SSA) funds Medicare. Taxes that automatically get deducted from an individual’s paycheck include Medicare taxes.
Medicare tax funds Medicare Part A insurance when a person becomes eligible at age 65 years or sooner due to a disability.
Currently, the Medicare tax rate is 2.9%. Employers pay 1.45%, and employees pay the remaining 1.45% in the form of a payroll deduction.
»Learn more:What does Medicare Part A cover?What is a quarter of coverage?
To calculate a person’s eligibility for premium-free Medicare Part A insurance, Medicare counts the number of employment quarters the individual worked.
A quarter of coverage is a 3-month calendar period during which a person worked in a job and paid Medicare taxes. Every quarter of coverage earned counts as 1 credit toward qualifying for free Medicare Part A.
During a quarter of coverage, an employee pays Federal Insurance Contributions Act (FICA) taxes, which combine withheld taxes for Medicare and Social Security. On a paycheck, Medicare withholding tax appears as “Fed Med/EE.”
Each year has 4 quarters. So 40 quarters equals roughly 10 years of work.
The “40 quarters” rule applies to premium-free Medicare Part A only. Other parts of Medicare, including Medicare Part B, involve a monthly premium regardless of how long a person has worked in their lifetime.
Working quarters affect on monthly premiums
Although Medicare requires people to earn 40 credits for premium-free Part A coverage, those who earned fewer credits may still obtain Medicare Part A as long as they pay a monthly premium.
The monthly cost for Medicare Part A may change. In 2025, people who paid Medicare taxes and earned between 30 and 39 quarters pay a monthly Part A premium of $285. Individuals who paid Medicare taxes for fewer than 30 quarters pay $518 a month.
Qualifying earning amounts for Medicare
To qualify for premium-free Medicare, an individual must also earn a certain amount during the quarters worked.
Medicare divides yearly earnings into quarters to determine how many credits a person has earned.
The earnings required may change from year to year. In 2025, individuals must earn $1,810 per quarter ($7,240 in a year) to be eligible for premium-free Medicare.
Some people may earn enough in 1 quarter to qualify for all 4 credits. In other cases, it might take someone the entire year to make enough to be eligible for all 4 credits earned.
Regardless of a person’s income amount, they cannot earn more than 4 credits in 1 year.
Earning a higher amount does not affect the amount of Medicare benefits a person receives, either. For instance, a person does not get additional Medicare Part A benefits or discounts because they earned more than the minimum 40 quarters.
Additionally, even when a person qualifies for premium-free Medicare Part A, they must pay a deductible for certain services.
»Learn more:How much does Medicare Part A cost?Qualifying quarters and disability for Medicare
The specific number of quarters of coverage depends on whether an individual is applying for Part A coverage based on a disability or age.
Adults younger than 65 years old may also qualify for free Medicare Part A if they:
- receive Social Security disability benefits
- have amyotrophic lateral sclerosis (ALS)
- have end stage renal disease (ESRD)
When in receipt of Social Security disability benefits, individuals must have worked a certain number of quarters, depending on their age, to be entitled to premium-free Medicare Part A:
| Age | Working quarters |
|---|---|
| before 24 years | 6 work credits earned within the 3-year period before the start of disability |
| 24 to 31 years | must have worked half the time between age 21 years and when a disability was acquired — for example, if a person acquires a disability at 27 years old, they must have earned 12 work credits within the past 6 years |
| 31 years and over | must have earned at least 20 work credits in 10 years before they acquired a disability |
Eligibility based on a spouse’s work history
A married person who has not worked at all or has not worked enough to earn credits toward free Medicare might gain premium-free Part A through their spouse’s employment.
To qualify based on a spouse’s employment, an individual must be at least 65 years old, and their spouse must be 62 years old or over and have earned enough Medicare credits to qualify for free Medicare Part A for themselves.
Options if not enough quarters worked
Options are available to obtain Medicare Part A if a person did not earn enough working quarters.
Medicare savings programs are federally funded assistance programs that each state administers to help with the costs associated with Medicare.
There are four different Medicare savings programs. Most of the programs help pay for Medicare Part B premiums.
The Qualified Medicare Beneficiary Program helps pay for premiums and other costs of Part A. Income limits apply to qualify for the assistance programs.
Medicare resources
For more resources to help guide you through the complex world of medical insurance, visit our Medicare hub.
Summary
For premium-free Medicare Part A, an individual must have worked 40 quarters. This is about 10 years of working and paying Medicare taxes.
A quarter of coverage refers to a 3-month period of work that includes Medicare taxes. Also, in 2025, a person must earn $1,810 per quarter to qualify.
People who do not have 40 quarters of qualifying employment may buy Medicare Part A.
A younger adult with a disability would not need to have earned the full 40 quarters, but the required number of credits will vary depending on age.
In some cases, an individual who does not qualify alone may qualify based on the work history of a spouse.
The information on this website may assist you in making personal decisions about insurance, but it is not intended to provide advice regarding the purchase or use of any insurance or insurance products. Healthline Media does not transact the business of insurance in any manner and is not licensed as an insurance company or producer in any U.S. jurisdiction. Healthline Media does not recommend or endorse any third parties that may transact the business of insurance.
- Health Insurance / Medical Insurance
- Medicare / Medicaid / SCHIP
How we reviewed this article:
SourcesMedical News Today has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical journals and associations. We only use quality, credible sources to ensure content accuracy and integrity. You can learn more about how we ensure our content is accurate and current by reading our editorial policy.- 2025 Medicare parts A & B premiums and deductibles. (2024). https://www.cms.gov/newsroom/fact-sheets/2025-medicare-parts-b-premiums-and-deductibles
- Medicare savings programs. (n.d.). https://www.medicare.gov/basics/costs/help/medicare-savings-programs
- Quarter of coverage. (n.d.). https://www.ssa.gov/OACT/COLA/QC.html
- Topic no. 751, Social Security and Medicare withholding rates. (2025). https://www.irs.gov/taxtopics/tc751
- Understanding Supplemental Security Income Social Security entitlement -- 2024 edition. (2024). https://www.ssa.gov/ssi/text-entitle-ussi.htm
- What does Medicare cost? (n.d.). https://www.medicare.gov/basics/get-started-with-medicare/medicare-basics/what-does-medicare-cost
- Who's eligible for Medicare? (2022).https://www.hhs.gov/answers/medicare-and-medicaid/who-is-eligible-for-medicare/index.html
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Medically reviewed by Oluwatoyin Kuloyo, Pharm.D., BCPS — Written by MaryAnn De Pietro, CRT — Updated on May 21, 2025Latest news
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