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Working Past 65 Bundle

The complete playbook for staying employed past Medicare age — when to defer, when to enroll, employer coordination, the COBRA trap, HSA timing, the 8-month return SEP, and forms (CMS-L564, CMS-1763) you need.

Best for: Anyone 64-70 still working with employer coverage and unsure whether to defer Medicare or enroll. The wrong move can cost $20K+ in late-enrollment penalties or in employer-coverage gaps.

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Who this is for

  • Working 64+ with employer health insurance
  • Self-employed approaching 65 with individual insurance
  • 65+ on a spouse's employer plan
  • Recently retired and within 8-month SEP window
  • HR/benefits administrators handling Medicare-eligible employees
  • S-corp owners and small business owners over 65

What's inside

  • 20-employee rule — does your employer's plan stay primary, or does Medicare?
  • HSA contribution timing — Medicare enrollment ends HSA contributions
  • Part A: take it or defer? The case for each
  • COBRA trap: COBRA is creditable for Part D, NOT for Part B
  • Form CMS-L564: getting evidence of creditable coverage
  • Form CMS-1763: dropping Part B if you're enrolled but covered elsewhere
  • 8-month return SEP — when employer coverage ends, you have 8 months
  • Self-employed scenarios: sole prop, S-corp, LLC, freelance contracts
  • Cheat sheet: decision tree for every employment situation

Preview — The 20-employee rule (this is everything)

If your employer (or your spouse's employer if you're on their plan) has 20 or more employees, the employer plan is PRIMARY and Medicare is SECONDARY when you're enrolled in both. You can safely defer Medicare and use the employer plan as your main coverage. No late penalty when you eventually enroll.

If your employer has FEWER than 20 employees, Medicare is PRIMARY and the employer plan is SECONDARY. In this case, you MUST enroll in Medicare at 65, even if you have employer coverage. The employer plan won't fully cover what Medicare would pay because Medicare is primary by federal law — meaning the employer plan only kicks in for the gaps Medicare leaves.

This is the single most important question to ask BEFORE turning 65: is my employer (or spouse's employer) of 20+ employees, or under 20? If under 20, defer is not an option — you'll be uninsured for the gaps if you don't enroll.

How to verify: ask HR for the employer's 'group health plan size for Medicare coordination' in writing. Document the answer. Some employers fluctuate around 20 employees year-over-year — federal rules use the prior calendar year's average.

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Full table of contents

  1. The 20-employee rule (this is everything)
  2. HSA contribution timing — the trap that catches everyone
  3. Should you take Part A even if deferring Part B?
  4. COBRA: creditable for Part D, NOT for Part B
  5. Form CMS-L564 — your creditable coverage proof
  6. Self-employed at 65 — the murky case
  7. Form CMS-1763 — dropping Part B if needed
  8. Couples scenarios
Key takeaways
  • 20-employee rule: 20+ = defer is safe. Under 20 = MUST enroll at 65.
  • Part A while working: usually fine, but kills HSA contributions.
  • COBRA isn't creditable for Part B. SEP starts at active employment end.
  • Form CMS-L564 = evidence-of-coverage proof for SEP enrollment.
  • 8-month Part B SEP after active employment ends. Don't wait.
  • Self-employed individual plan: usually no defer, enroll at 65.
  • Form CMS-1763 = drop Part B if already enrolled and employer covers.
Action steps
  1. Confirm employer's group plan size (20+ or under 20) in writing.
  2. If on HSA, calendar last contribution + Medicare enrollment date.
  3. Get CMS-L564 filled out by HR before you leave coverage.
  4. Set Part B enrollment for the month before group coverage ends.
  5. If recently laid off/retired: enroll Part B within 8 months of active employment end (not COBRA end).
  6. Self-employed approaching 65: enroll in Medicare unless on a true 20+ group plan.
Cheat sheet — Working past 65 decision tree
  • · Employer 20+? → Defer is safe, employer is primary
  • · Employer under 20? → Enroll Part B at 65, Medicare is primary
  • · On HSA? → Defer ALL Medicare parts including A to keep contributing
  • · On COBRA? → Part B SEP starts at active employment end, NOT COBRA end
  • · Leaving job? → 8-month Part B SEP. Use it.
  • · Self-employed individual plan? → Usually enroll at 65
  • · Already on Part B and starting 20+ job? → Form CMS-1763 to drop
  • · Form CMS-L564 = your creditable coverage attestation

FAQ

What if I'm self-employed but my spouse has employer coverage 20+?+

If you're on your spouse's employer plan as a dependent and their employer has 20+ employees, the rules apply to YOU same as if you were the employee. Defer is safe.

Can I delay Medicare AND keep collecting Social Security?+

Yes for Part B and D. NO for Part A — collecting SS auto-enrolls you in Part A retroactively up to 6 months when you do sign up. So if HSA matters, you must defer SS too.

What's the late-enrollment penalty math?+

Part B: 10% per 12 months of delay, permanent. Five years late = 50% added to your monthly Part B premium for life. On 2026 standard $202.90/mo premium = $101/mo penalty added forever. Lifetime cost over 20 years of retirement: $24K+.

Pairs well with

Medicare Course ($49)
Social Security Claiming Strategy ($29)

Working Past 65 Bundle for $29.

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