Turning 65 in Utah · Leaving HealthCare.gov for Medicare

Can I Keep My Marketplace Plan When I Turn 65 in Utah?

If you retired early, are self-employed, or have been covering yourself through HealthCare.gov, your 65th birthday is the one time two federal programs hand you off to each other, and neither does it for you. Medicare does not cancel your Marketplace plan. The Marketplace does not enroll you in Medicare. The tax credit that has been lowering your premium stops on a date set by regulation whether or not you noticed. Here is what you are allowed to keep, what it costs to keep it, and the exact dates to report for a clean switch.

Medicare On Main Data Desk

Published October 10, 2026 · 9 min read · Reviewed by Brian Penner, 22+ years in Medicare

Start with what the two programs say about each other. HealthCare.gov puts it in one line: "Medicare isn't part of (and doesn't work with) the Health Insurance Marketplace." They are separate systems with separate computers. Utah does not run its own exchange, so a Utah resident buying individual coverage is on the federal HealthCare.gov platform, and everything below is the federal procedure with no state layer in between. (Our Grand Junction readers are on Connect for Health Colorado instead; the federal Medicare and tax rules are the same, but the cancellation steps happen on Colorado's site.)

About 490,235 Utahns are on Medicare (CMS, June 2026). Most of them came from an employer plan, where the handoff is rehearsed by an HR department. The ones who came from the Marketplace did it alone, and the two mistakes that cost the most are the plan that was never ended, and the Medicare enrollment that was put off because the Marketplace plan "was working fine."

What actually changes on your Medicare start date

The HealthCare.gov page on changing from Marketplace to Medicare is direct: "If you will soon get or already have Medicare Part A (Hospital Insurance) or Medicare Advantage (Part C), you should end your Marketplace coverage. You can't get savings on your Marketplace plan premiums or out-of-pocket costs once you're eligible for Medicare Part A, or once your Medicare Part A or Medicare Advantage (Part C) coverage starts. You'll have to pay full price for your Marketplace plan."

Notice the word eligible. The savings do not stop because you enrolled in Medicare. They stop because you could have. That distinction is where most of the trouble comes from, and it gets its own section below.

Here are the four ways this goes, side by side:

Sources: HealthCare.gov, Changing from Marketplace to Medicare; IRS premium tax credit Q&A, Q31; 26 CFR § 1.36B-2(c)(2); Medicare.gov, Avoid late enrollment penalties; Medicare.gov costs page for the $311 or $565 Part A premium in 2026.

The dates: when to report, and when the plan ends

HealthCare.gov gives the rule and one example: "You can report a Medicare start date on your application up to 3 months before Medicare starts ... If your Medicare begins on May 1, you can update your Marketplace application as early as February 1. In your application, report that your Medicare starts on May 1. Your Marketplace coverage ends on April 30 (the day before Medicare coverage starts)." Applied to the next year of birthdays, for someone who signs up for Medicare in the three months before the birthday month and was not born on the first of a month:

Columns two through four are arithmetic on the HealthCare.gov rule above and on Medicare.gov's coverage-start rules. The last column is our reading of 26 CFR § 1.36B-2(c)(2)(ii) and its Example 3; it is a tax question, so confirm it with your tax advisor. If you were born on the first of a month, Medicare starts a month earlier and every date in your row moves up one month. If you sign up during or after your birthday month, Medicare starts the following month and the Marketplace end date moves with it.

Two rows need a warning this fall. If you turn 65 in December or January, the Marketplace's own Open Enrollment (it starts November 1, per HealthCare.gov) will offer to renew your plan for 2027. Do not let it auto-renew for the person going on Medicare. Report the Medicare date first, then confirm the 2027 plan only for a spouse or dependent who is staying. How your Medicare start date is set, month by month, is in when does Medicare coverage start after I sign up at 65?, and our Turning 65 page will calculate it from your birthday.

The tax credit ends when you are eligible, not when you enroll

People reasonably assume that if they do not sign up for Medicare, nothing changes with their Marketplace subsidy. The tax regulation says otherwise. Under 26 CFR § 1.36B-2(c)(2)(ii), "An individual who fails by the last day of the third full calendar month following the event that establishes eligibility ... to complete the requirements to obtain government-sponsored minimum essential coverage ... is treated as eligible for government-sponsored minimum essential coverage as of the first day of the fourth calendar month following the event." The regulation's own example is a taxpayer who "turns 65 on June 3" and "fails to enroll in the Medicare coverage during [the] initial enrollment period." That person "is treated as eligible ... as of October 1."

In plain terms: the credit is available until your Medicare could have started, plus a short grace period if you did nothing, and then it is gone. Any advance payments the Marketplace keeps sending to your insurer after that date are not yours. You settle up on Form 8962 with your tax return.

That used to be a limited problem for many households, because repayment was capped by income. It is not capped now. The IRS Q&A, updated December 23, 2025: "There is no repayment cap for tax years after 2025. For tax years after 2025, you must repay the full amount by which your advance credit payments exceed your Premium Tax Credit." A plan left running by oversight for six months after Medicare began means six months of credit returned in one April. HealthCare.gov also runs periodic data matches; if it finds Medicare on your record it sends a letter and, in its words, "you need to take action within 30 days."

A related trap for people who start Social Security at 62, 63 or 64: you are enrolled in Medicare Parts A and B automatically at 65. You never filled out a Medicare form, so it is easy to believe nothing happened. Something did, and the Marketplace plan is now the thing you have to end. That automatic path is described in can I get Medicare at 65 without taking Social Security?

Why a Marketplace plan does not let you delay Part B

The rule that lets some 65-year-olds postpone Part B without penalty is about coverage from a current employer, yours or your spouse's. An individual plan you bought yourself is not that, no matter how good it is. HealthCare.gov: Marketplace coverage "isn't used in place of Medicare Part B." If you keep it and sign up for Medicare after your seven-month Initial Enrollment Period, you "may have to wait until the General Enrollment Period (January 1 – March 31 each year)," coverage then starts the month after you sign up, and "in most cases, you'll also have to pay monthly late enrollment penalties for Part B and Part D."

• Part B. Medicare.gov: "You'll pay an extra 10% for each year you could have signed up for Part B, but didn't." Its 2026 example for a 24-month delay: $202.90 plus a 20% penalty, "$243.50 will be your Part B monthly premium for 2026." The percentage stays for as long as you have Part B and is recalculated on each year's premium.
• Part D. "An extra 1% for each month" you go without creditable drug coverage after you first get Medicare, figured on the national base premium ($38.99 in 2026), once you have gone "63 days or more." Whether a Marketplace plan's drug benefit counts is not automatic: HealthCare.gov says it "doesn't have to provide the same value (creditable coverage) as Medicare Part D coverage," and that the plan "must tell you in writing" each year. Find that notice before you rely on it.

The employer-coverage version of this decision, including the 20-employee rule, is in do I need Medicare at 65 if I'm still working in Utah? If your bridge to 65 was COBRA rather than the Marketplace, the same "not current employment" logic applies, covered in COBRA instead of Medicare at 65.

The one group with a genuine choice

If you or your spouse did not work roughly ten years in Medicare-taxed jobs, Part A is not premium-free for you. In 2026 it costs "$311 or $565 each month," per Medicare.gov, and you must take Part B with it. HealthCare.gov treats this case differently: "If you have to pay a premium for Medicare Part A, you can choose whether you want to have coverage through Medicare or the Marketplace. Compare your costs and coverage, and consider the Medicare late enrollment penalties when making your decision." A person in that position who has not enrolled in Medicare can still qualify for Marketplace savings. It is a real comparison with real numbers on both sides, and it is worth doing on paper with someone who will show the Medicare penalties in the Marketplace column.

When one of you is 65 and the other is not

A very common household: one spouse aging into Medicare, the other 61 or 63 and staying on the Marketplace. The younger spouse's coverage does not end. What changes is the application: the person starting Medicare comes off, the coverage household shrinks to one, and the tax credit is refigured on the same household income. HealthCare.gov's instruction is to submit the update and then "make sure you confirm the plan for others in your household who need to keep their Marketplace coverage." Do not use the "cancel plan" path for the whole policy unless everyone is leaving; the cancellation page separates ending coverage for some people from ending it for everybody. The younger spouse's options in more depth are in is my spouse eligible for Medicare when I turn 65?

One planning note for higher-income households: the income that decides your spouse's tax credit and the income that decides your own Medicare surcharge two years later are measured on the same tax return. A Roth conversion or a large capital gain in the year you turn 65 can cost on both sides at once. See will a Roth conversion raise my Medicare premiums? and talk to your tax advisor before year-end.

What I would do, in order

1. Four months before your birthday month, find your Medicare start date. If you are not yet on Social Security, you have to sign up; do it in the three months before your birthday month so coverage begins on the first of that month.
2. The day the 3 months window opens, update your HealthCare.gov application with the Medicare start date for the person turning 65. Do not wait for the Medicare card.
3. Confirm the remaining household's plan if a spouse or dependent is staying, and check the new premium.
4. Choose what sits on top of Medicare before the start date: a Medigap policy and a Part D plan, or a Medicare Advantage plan. Your six-month Medigap window starts with Part B, and it only happens once.
5. Check the first month's bank statement. If the Marketplace insurer drafted a premium for a month you were on Medicare, call the Marketplace that week, not at tax time.
6. Keep Form 1095-A when it arrives in January and give it to your tax preparer with your Medicare start date written on it.

How we know all this: the Medicare On Main Data Desk frames every article with public data — here, HealthCare.gov's "Changing from Marketplace to Medicare," "If you have Medicare," cancellation and Open Enrollment dates pages; the IRS "Questions and answers on the Premium Tax Credit" (FS-2025-10); 26 CFR § 1.36B-2(c)(2) as published by Cornell's Legal Information Institute; Medicare.gov's late-enrollment-penalty, coverage-start and costs pages; and the CMS Medicare Monthly Enrollment dataset for Utah, all read October 10, 2026. Worked dates are arithmetic on those rules and should be confirmed against your own Medicare card and Marketplace account. Medicare On Main is a licensed independent insurance agency. We do not offer every plan available in your area. Any information we provide is limited to the plans we do offer in your area. Please contact Medicare.gov or 1-800-MEDICARE to get information on all of your options. Not connected with or endorsed by the U.S. government or the federal Medicare program. This is education, not tax or legal advice; confirm tax-credit questions with your tax advisor and enrollment dates with Social Security, HealthCare.gov or Medicare.gov. We take no payment from any carrier to feature a plan.