Utah · Medicare · 2026

Working Past 65 in Utah: Medicare, Your Employer Plan & the Part B Penalty (2026)

Whether you can safely delay Medicare comes down to one number: how many people work at the company providing your health plan. Twenty is the line — and getting it wrong can cost you for life.

Utah Retirement Income Data Desk

Reviewed by Brian Penner, Retirement income & long-term care planner · Updated July 20, 2026

The bottom line

20 or more employees: the group plan pays first, Medicare pays second — you can usually delay Part B penalty-free (Medicare.gov).
Fewer than 20 employees: Medicare pays first — delaying can leave big bills nobody covers.
When the job or the coverage ends, you get an 8-month Special Enrollment Period to add Part B with no penalty.
Miss it and Part B costs 10% more per full year late — for life (about $20.29/month per year against 2026's $202.90 premium).
COBRA and retiree plans don't count as current employer coverage, and HSA contributions must stop when Medicare starts.

Utah has more people working past 65 than the stereotype suggests — school-district staff in Davis County, contractors along the Wasatch Front, ranchers in Cache Valley, small-shop owners in St. George and Moab. If that's you, the question isn't "should I retire?" It's narrower and more urgent: do I have to take Medicare at 65, or can I stay on the plan I already have?

The honest answer is that Medicare doesn't care how healthy you are or how much you like your employer plan. It cares about employer size, and it enforces the answer with penalties that never go away. Here's how the 2026 rules actually work, with the official numbers.

What actually decides it: the 20-employee rule

Medicare's coordination-of-benefits rules set who pays a claim first — the "primary payer" — and who picks up the remainder. For people 65 and older with coverage from a current job, the threshold is simple:

Employer size	Who pays first	What that means for you at 65
20 or more employees	Group health plan pays first; Medicare pays second	You can generally delay Part B (and Part D, if drug coverage is creditable) without a penalty, then enroll when the job or coverage ends.
Fewer than 20 employees	Medicare pays first; group plan pays second	Your group plan may pay little or nothing on claims Medicare would have covered. Enrolling in Part A and Part B at 65 is usually necessary.

Source: Medicare.gov, "Who pays first?" — medicare.gov/health-drug-plans/coordination/who-pays-first. Coverage must be based on current employment (yours or your spouse's).

Why this matters more in Utah than almost anywhere: Utah is the youngest state in the country, with a median age of 32.0, and just 14% of Utah employment is at firms where at least a quarter of workers are older — the lowest share in the nation (U.S. Census Bureau, Business Dynamics Statistics of Human Capital, 2022 data, published Dec. 2, 2025). Translation: a Utahn still working at 65 is unusually likely to be at a small business — exactly the situation where Medicare pays first and delaying enrollment is the expensive choice. Don't assume the "everyone delays Part B" advice you heard from a friend in a bigger state applies to you. Ask HR, in writing, how many employees the company has.

What does "current employment" mean — does COBRA count?

No — and this is the mistake that costs Utah families the most money. Medicare recognizes a Special Enrollment Period only for coverage tied to a job someone is actively working. Per Medicare, COBRA and retiree health plans aren't considered coverage based on current employment, so when they end you don't get a Special Enrollment Period.

Picture a common scenario: you leave a Salt Lake County employer at 65, elect 18 months of COBRA because it feels familiar, and skip Medicare. Your 8-month window quietly closes while you're paying COBRA premiums. When COBRA ends you discover you must wait for the General Enrollment Period — and you'll carry a Part B penalty for the rest of your life. Same story with a retiree health plan: it's a supplement to Medicare in Medicare's eyes, not a substitute for it.

How long do I have to sign up after I stop working?

You get an 8-month Special Enrollment Period (SEP). It starts the month after either your employment ends or your group health coverage ends — whichever happens first. Enroll inside that window and you owe no Part B late enrollment penalty.

Confirm the employer size and get the creditable-coverage notice from HR before you make any decision. Both facts should be in writing.
Mark the trigger date — the earlier of your last day of work and your last day of group coverage. The clock starts the following month.
File with Social Security, not your insurer. Part B enrollment during the SEP uses forms CMS-40B (your application) plus CMS-L564, which your employer completes to prove you had coverage.
Line up drug coverage within 63 days of losing creditable employer drug coverage to avoid the Part D penalty.
Decide on Medigap vs. Medicare Advantage before Part B starts — your Medigap open enrollment window opens when Part B begins.

Miss the 8 months and your fallback is the General Enrollment Period, January 1 – March 31, with coverage starting the month after you sign up. That's both a coverage gap and a permanent penalty.

What the Part B late enrollment penalty really costs

The formula is blunt: 10% of the standard Part B premium for each full 12-month period you could have had Part B but didn't. For most people it lasts as long as you have Part B. Against the 2026 standard premium of $202.90 a month, here's the arithmetic:

Years late	Penalty	Added per month	Total Part B premium	Extra per year
1 year	10%	+$20.29	$223.19	$243
2 years	20%	+$40.58	$243.48	$487
3 years	30%	+$60.87	$263.77	$730
5 years	50%	+$101.45	$304.35	$1,217
8 years	80%	+$162.32	$365.22	$1,948

Calculated from the Medicare.gov penalty formula (10% per full 12 months) applied to the 2026 standard Part B premium of $202.90 (CMS). Illustration only; Social Security calculates your actual penalty. Sources: medicare.gov; cms.gov.

On time $203

1 yr late $223

2 yr late $243

3 yr late $264

5 yr late $304

8 yr late $365

Total monthly Part B premium in 2026 by years of late enrollment. Sources: Medicare.gov penalty formula; CMS 2026 premium fact sheet.

$202.90

Standard 2026 Part B premium, per month (CMS)

8 months

Special Enrollment Period after work or coverage ends (Medicare.gov)

$38.99

2026 Part D national base premium — the Part D penalty base (CMS)

Sources: CMS, "2026 Medicare Parts A & B Premiums and Deductibles" — cms.gov; CMS, "2026 Medicare Part D Bid Information" — cms.gov.

Should I take Part A at 65 even if I keep my employer plan?

For most people Part A costs nothing — CMS reports that about 99% of Medicare beneficiaries pay no Part A premium because they have at least 40 quarters of Medicare-covered work. Taking premium-free Part A can add a layer of hospital coverage behind your group plan, subject to the 2026 Part A inpatient deductible of $1,736.

There is exactly one big reason a working Utahn might not take Part A at 65 — and it's the next section.

(If you don't have 40 quarters, Part A isn't automatic: people with 30–39 quarters can buy in at a reduced $311 a month in 2026, and those with fewer quarters pay the full rate. Part A also carries its own late enrollment penalty when you have to buy it.)

The HSA trap: when Medicare and your health savings account collide

If you're covering yourself with a high-deductible health plan and funding an HSA, enrolling in any part of Medicare — including premium-free Part A — ends your ability to contribute. Two details catch people:

Part A can be retroactive. When you enroll after 65, Part A coverage can begin up to 6 months before the month you apply (never earlier than the month you turned 65). Contributions made during those retroactive months become excess contributions.
Filing for Social Security triggers Part A. You can't take Social Security at 65+ and decline Part A. CMS guidance is to stop HSA contributions 6 months before you retire or apply for Social Security to avoid the tax problem.

Excess contributions can generally be withdrawn — along with the earnings attributable to them — by your tax filing deadline including extensions, per IRS Publication 969. But it's a headache worth avoiding. Talk to your tax preparer before you file for anything.

The planning tension in one line: the small-employer worker usually must take Medicare at 65, while the HSA saver usually wants to delay it. If you're both — a Utah small-business owner with an HDHP and an HSA — you have a real decision to make, and the right answer depends on your claims, your premiums, and your tax situation, not on a rule of thumb.

What about drug coverage and Part D?

Part D has its own, separate penalty. If you go 63 days or more after your Initial Enrollment Period without Medicare drug coverage or other creditable coverage, the penalty is 1% of the national base beneficiary premium ($38.99 in 2026) for every full uncovered month, rounded to the nearest 10 cents and added to your plan premium for as long as you have Part D.

Employer plans are often creditable — but "often" isn't "always," and the burden of proof is on you. Your plan is required to tell you each year whether its drug coverage is creditable. Keep those notices. A year of uncovered months is roughly $4.70 a month added for life; five years is about $23.40 a month. Small numbers that compound quietly.

Still working at 65 and not sure what you're supposed to do?

We help Utah workers and their spouses sort out employer size, creditable coverage, HSA timing, and the 8-month window — before a deadline turns into a lifetime penalty. Plain English, no pressure.

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A checklist for Utahns approaching 65 while still working

Three months before your 65th birthday: ask HR for the employee count and a written creditable-coverage notice for drug benefits.
If the employer has fewer than 20 employees: plan to enroll in Part A and Part B during your Initial Enrollment Period — the 7-month window around your 65th birthday month.
If you fund an HSA: stop contributions about 6 months before you'll file for Medicare or Social Security.
When you stop working: start the 8-month clock from the earlier of your last day of work or last day of coverage, and file forms CMS-40B and CMS-L564 with Social Security.
Don't rely on COBRA or a retiree plan to hold your place. Neither one earns you a Special Enrollment Period.
Compare Medigap and Medicare Advantage before Part B starts, so you use your Medigap open enrollment window rather than losing it.

Frequently asked questions

If I'm still working at 65 in Utah, do I have to sign up for Medicare?

It depends on the size of the employer whose plan covers you. If the employer has 20 or more employees, the group health plan pays first and Medicare pays second, so you can generally delay Part B without a penalty and enroll later using a Special Enrollment Period. If the employer has fewer than 20 employees, Medicare pays first — meaning your group plan may pay little or nothing until you enroll in Part A and Part B. In that case, delaying can leave you with large uncovered bills.

How long do I have to sign up for Medicare after I stop working?

You get an 8-month Special Enrollment Period that starts the month after your employment ends or your group health coverage ends, whichever comes first. Sign up inside that window and you owe no Part B late enrollment penalty. Miss it and you generally have to wait for the General Enrollment Period, January 1 through March 31, with coverage starting the month after you sign up — a gap plus a lifetime penalty.

How much is the Medicare Part B late enrollment penalty in 2026?

The Part B penalty is 10% of the standard premium for each full 12-month period you could have had Part B but didn't. Against the 2026 standard premium of $202.90 a month, one year late adds about $20.29 a month, and three years late adds about $60.87 a month. For most people the penalty lasts as long as you have Part B — it is not a one-time charge.

Does COBRA or retiree coverage let me delay Medicare?

No. Medicare does not treat COBRA or retiree health coverage as coverage based on current employment, so neither one earns you a Special Enrollment Period when it ends. This is one of the most expensive misunderstandings in Medicare. If you are 65 or older and your only coverage is COBRA or a retiree plan, you generally need to enroll in Medicare when first eligible or risk a lifetime penalty.

Can I keep contributing to my HSA after I turn 65 if I keep working?

Only if you are not enrolled in any part of Medicare. Once Medicare coverage begins, HSA contributions must stop. The trap is retroactivity: when you enroll after 65, Part A can start up to 6 months earlier (but never before the month you turned 65), and contributions made during those retroactive months become excess contributions. Many people stop HSA contributions 6 months before they plan to file for Medicare or Social Security. This is educational, not tax advice.

What about Part D drug coverage if I work past 65 in Utah?

If your employer drug coverage is creditable — at least as good as Medicare's standard — you can delay Part D without penalty and enroll when that coverage ends. If you go 63 days or more without creditable drug coverage after your Initial Enrollment Period, you can owe a Part D late enrollment penalty of 1% of the national base beneficiary premium ($38.99 in 2026) for every full uncovered month, added to your plan premium for as long as you have Part D. Ask your plan administrator for the creditable coverage notice in writing.

Sources

Medicare.gov — Who pays first? (20-or-more vs. fewer-than-20 employee rule): medicare.gov/health-drug-plans/coordination/who-pays-first
Medicare.gov — Working past 65 (8-month Special Enrollment Period; employer coverage): medicare.gov/basics/get-started-with-medicare/medicare-basics/working-past-65
Medicare.gov — Avoid late enrollment penalties (Part B 10% per full 12 months): medicare.gov/basics/costs/medicare-costs/avoid-penalties
Medicare.gov — COBRA coverage and Medicare: medicare.gov/basics/get-started-with-medicare/medicare-basics/working-past-65/cobra-coverage
CMS — 2026 Medicare Parts A & B Premiums and Deductibles (Part B $202.90; Part A deductible $1,736; $311 reduced Part A premium; ~99% premium-free Part A): cms.gov/newsroom/fact-sheets/2026-medicare-parts-b-premiums-deductibles
CMS — 2026 Medicare Part D Bid Information (national base beneficiary premium $38.99): cms.gov/newsroom/fact-sheets/2026-medicare-part-d-bid-information-and-part-d-premium-stabilization-demonstration-parameters
CMS — Creditable Coverage and the Part D Late Enrollment Penalty (63-day rule, 1% formula): cms.gov/medicare/enrollment-renewal/part-d-plans/creditable-coverage-and-late-enrollment-penalty
SSA — When to sign up for Medicare (HSA guidance: stop contributions 6 months before applying): ssa.gov/medicare/plan/when-to-sign-up
IRS — Publication 969, Health Savings Accounts (Medicare enrollment ends HSA eligibility; correcting excess contributions): irs.gov/publications/p969
U.S. Census Bureau — "Firms in Production Sectors and Northern States Have Some of the Highest Shares of Older Workers" (Utah median age 32.0; 14% of employment at firms with ≥25% older workers, lowest in the nation; BDS-HC 2022 data, published Dec. 2, 2025): census.gov/library/stories/2025/12/older-workers.html

About this article. Written by the Utah Retirement Income Data Desk and reviewed by Brian Penner, Retirement income & long-term care planner. Educational only — not financial, tax, or legal advice. Utah Retirement Income is a licensed independent insurance agency (NPN 16493717); we do not offer every plan available in your area, and we are not connected with or endorsed by Medicare, CMS, the Social Security Administration, or any government agency. Medicare rules and figures change; confirm your own numbers at medicare.gov or ssa.gov, or with a licensed professional. Any call or text you request implies your consent to be contacted about your inquiry.