Updated July 31, 2026. Quick answer: your Medicare Initial Enrollment Period is a 7-month window: the three months before your 65th-birthday month, that month, and the three months after — with one exception almost nobody prints: born on the 1st of a month, you are treated as born the month before, and the entire window shifts a month earlier. Miss the window without qualifying employer coverage and the Part B penalty — 10% per full 12 months late — lasts for life.
The window, your dates
Use the milestones calculator for your computed window. Enrolling in the three months BEFORE the birthday month starts coverage on time; enrolling during or after can delay the start — the early months are the good months.
Working past 65: the rules that actually govern
Active employer coverage (20+ employees) lets you delay penalty-free, and an 8-month Special Enrollment Period opens when the employment or the coverage ends — whichever comes first, and COBRA does NOT count as active coverage for this purpose, the single most expensive misunderstanding in this system. HSA contributors have a second trap: Medicare enrollment ends HSA eligibility, and enrolling after 65 comes with retroactive Part A coverage of up to six months — contributions made into that lookback window create excess-contribution problems. Stop HSA contributions ahead of enrollment accordingly (the HSA strategy guide covers the account’s late-life role).
The premium itself is means-tested two years back — a high-income year at 63 shows up in your first Medicare bill: the IRMAA cliff rules.
A lifetime penalty for a paperwork miss is worth one planning conversation.
Coordinating the Medicare date with employer coverage, HSA contributions and IRMAA is standard adviser work. The matching service below introduces you to advisers who pay to meet you.
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