What do I need to know about Medicare before retiring?
David TalleyUpdated December 20, 2025
Quick Answer
Medicare eligibility begins at 65, regardless of retirement age. You should enroll during your Initial Enrollment Period (3 months before to 3 months after turning 65) to avoid late penalties. Original Medicare (Parts A & B) covers hospital and medical services; Part D covers prescriptions. Many people add Medigap or Medicare Advantage for additional coverage.
Medicare is complicated, but the core decisions are manageable. Here's what matters.
The timeline:
- Age 65: You're eligible (regardless of when you retire)
- Initial Enrollment Period: 7 months centered on your 65th birthday
- If you're still working with employer coverage, you may delay—but there are rules
The parts of Medicare:
- **Part A (Hospital)**: Usually premium-free if you paid payroll taxes for 10+ years
- **Part B (Medical)**: Monthly premium (~$175/month in 2024), covers doctor visits, outpatient care
- **Part D (Prescriptions)**: Separate plans with varying premiums and coverage
- **Medigap (Supplement)**: Fills gaps in Original Medicare, sold by private insurers
- **Medicare Advantage (Part C)**: Alternative to Original Medicare, often includes drug coverage
The decision tree:
1. Original Medicare + Medigap + Part D = Most flexibility, any doctor who accepts Medicare, predictable costs
2. Medicare Advantage = Often lower premiums, but network restrictions, variable out-of-pocket
The penalties:
If you don't enroll on time and don't have qualifying employer coverage:
- Part B: 10% penalty for each 12-month period you delayed (forever)
- Part D: 1% penalty per month you delayed (forever)
What people miss:
- IRMAA: High earners pay more for Parts B and D (based on tax returns from 2 years prior)
- Medigap timing: Best rates are during open enrollment at 65—if you wait, you may face medical underwriting
- Retiring before 65: You'll need bridge coverage (COBRA, marketplace, spouse's plan)
The bottom line:
Healthcare costs are one of the biggest retirement expenses. Understanding Medicare isn't optional—it's essential to retiring confidently.
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