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When do I sign up for Medicare if I’m still working

When do I sign up for Medicare if I’m still working

Enrollment
Last updated: 
April 10, 2026
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The short answer

If your employer has 20 or more employees, you can usually wait until you stop working to sign up for Part B without a penalty. However,most people still sign up for "premium-free" Part A during their 65thbirthday window just to have that extra hospital coverage.

The full explanation

When you turn 65, you enter what’s called your Initial Enrollment Period. This is a seven-month window: the three months before you turn 65, your birthday month, and the three months after. If you are still working and have "creditable"insurance (insurance from a job that is considered as good as Medicare), you have a choice.

If your company is small (fewer than 20 people), Medicare usually becomes your primary insurance the day you turn 65, meaning you must sign up then to avoid big gaps in coverage and future late fees. If your company is large, you can delay Part B (the part that covers doctor visits and has a monthly premium) until you actually retire. Once you stop working or lose that job-based insurance, you get an eight-month Special Enrollment Period to sign up. Just be careful:if you have a Health Savings Account (HSA), you usually need to stop contributing to it six months before you sign up for Medicare to avoid tax headaches.

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In 

Pennsylvania

 specifically

In Pennsylvania, many of our neighbors work well past 65,especially in our thriving tech and healthcare sectors along the larger metro counties.If you work for one of Pennsylvania's large employers—like the University of Pennsylvania, or even the State—their benefits offices are very familiar with "coordinating" with Medicare. It is always a good idea to chat with your HR person. They can provide you with a specific form (the CMS-L564)when you finally do retire to prove you had coverage, which keeps the"Medicare police" from charging you late fees. Pennsylvania residents can also get free Medicare counseling through APPRISE.

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What this means for you

For you, this means flexibility. You don't have to rush into paying for Part B premiums (which are $202.90 a month for most people in 2026) if you already have great insurance at work. It gives you time to compare your current work plan against Medicare to see which one actually saves you more on your prescriptions and doctor visits.

Related Questions

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Still have questions about Medicare?

Book a review with a licensed Medicare advisor.

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Decision area Tool What it answers
Enrollment Initial Enrollment Period Calculator When your 7-month Medicare eligibility window begins and ends based on your 65th birthday
Enrollment When Should I Sign Up for Medicare? The best time to enroll based on your work status, other coverage, and age
Enrollment Special Enrollment Period Checker Whether a life event qualifies you for enrollment outside the standard windows
Enrollment Late Enrollment Penalty Checker How much extra you'll pay monthly if you missed your enrollment window
Enrollment Part B Penalty Calculator The exact 10%-per-year premium increase for delayed Part B enrollment
Enrollment Part D Penalty Calculator The 1%-per-month premium increase for gaps in creditable drug coverage
Costs Cost Scenario Planner Estimated annual spending across plan types at different health utilization levels
Costs Advantage vs. Medigap Cost Comparison True cost difference between Medicare Advantage and Original Medicare with Medigap
Costs IRMAA Calculator Whether your income triggers higher Part B and Part D premiums
Costs Part A Premium Estimator Your monthly Part A premium based on work history and quarters of coverage
Costs M3P Calculator How the Medicare Prescription Payment Plan smooths your drug costs into monthly payments
Coverage Doctor & Drug Assessment Whether your providers and prescriptions are covered by a specific plan
Coverage Part D Shopping Tool Which Part D plan has the lowest total annual cost for your specific medications
Coverage Travel & Network Risk Assessment How your coverage works outside your home area and which plan types travel best
Employer/COBRA COBRA vs. Medicare Why COBRA can trigger permanent Medicare penalties and how costs compare
Employer/COBRA Employer Coverage vs. Medicare Whether your employer plan or Medicare is primary and when to transition
Employer/COBRA HSA & Medicare Compatibility How Medicare enrollment affects HSA eligibility and what to do before enrolling
Planning Caregiver Readiness Checklist Whether you have everything in place to help a loved one with Medicare decisions
Planning Document Gatherer Which documents you need to have ready before enrolling or changing plans
Planning Medigap Fit Assessment Whether Medigap or Medicare Advantage is the better fit for how you use healthcare
Planning Medigap Open Enrollment Window Whether you're inside your one-time guaranteed issue window for Medigap
Planning Medicare Savings Program Eligibility Whether your income qualifies you for help paying Medicare premiums and cost-sharing

‍CMS TPMO Compliance Disclaimer: We do not offer every plan available in your area. Please contact Medicare.gov, 1-800-MEDICARE, or your local State Health Insurance Program (SHIP) to get information on all of your options.

Participating sales agencies represent Medicare Advantage [HMO, PPO, PFFS, and PDP] organizations that are contracted with Medicare. Enrollment depends on the plan’s contract renewal.

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‍Data & Methodology for Research Articles: All provider, facility, quality star ratings, and enrollment data is sourced from primary CMS records (cms.gov), including the December 2025 CPSC Enrollment files and the January 2026 Provider Data Catalog. Calculations for patient-to-provider ratios are performed using indexed clinician and facility data. Everything on restingsycamore.com is for educational purposes and does not constitute an endorsement of any specific plan or provider.

Non-CMS Data Sources: Some  specific data was obtained from https://opendata.gov