The short answer
If you have an ACA Marketplace plan with a premium subsidy and you become eligible for Medicare at 65, you generally need to move off the Marketplace plan. Here's the trap: once you're eligible for premium-free Part A, you can't keep receiving a Marketplace subsidy — and if you do, you may have to repay it at tax time. Many people don't realize this and get a surprise bill.
So turning 65 on a Marketplace plan means making a clean transition to Medicare, not keeping both.
Why keeping both backfires
The premium tax credit that lowers your Marketplace premium is only for people who don't have access to other qualifying coverage like Medicare. Once you're eligible for premium-free Part A, you no longer qualify for the subsidy. If you keep taking it, the IRS can require you to pay it back when you file. On top of that, delaying Medicare enrollment can trigger late penalties.
So the overlap isn't just redundant — it can cost you twice, in repaid subsidies and potential penalties. Our pre-Medicare coverage overview covers the transition.
How to transition cleanly
Enroll in Medicare during your Initial Enrollment Period around your 65th birthday, and end your Marketplace plan so its coverage stops when Medicare begins — timed so there's no gap and no overlap. Update the Marketplace that you're gaining Medicare so your subsidy stops correctly.
Done right, it's a smooth handoff. Our guide to the ACA Marketplace and the pre-Medicare overview walk through timing so you avoid both the subsidy repayment and any coverage gap.
Frequently Asked Questions
Can I keep my Marketplace subsidy after I qualify for Medicare?
No. Once you're eligible for premium-free Part A, you no longer qualify for a Marketplace premium subsidy. Keeping it can force you to repay the subsidy at tax time.
What happens if I keep both Marketplace and Medicare?
You may have to repay the subsidy when you file taxes, and delaying Medicare enrollment can trigger late penalties — so the overlap can cost you twice.
How do I transition from a Marketplace plan to Medicare?
Enroll in Medicare during your Initial Enrollment Period, end your Marketplace plan so it stops when Medicare begins, and tell the Marketplace you're gaining Medicare so the subsidy stops correctly.
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