Utah · Working past 65

Do I Need Medicare at 65 If I'm Still Working in Utah?

Part A, almost always. Part B depends on how many people your employer has on the payroll, and the 20-employee rule is not the penalty rule most articles say it is. It is a payment-order rule. In a state where 89.4% of private worksites have fewer than 20 employees, that distinction decides whether waiting is a free choice or an expensive one. Here is the regulation, quoted, and the decision by employer size.

Medicare On Main Data Desk

Published September 26, 2026 · 9 min read · Reviewed by Brian Penner, 22+ years in Medicare

The Utah version of this question has a shape the national articles miss. Nationally, most people who work past 65 work for someone large, and the advice "you can wait if you have employer coverage" is right for them. In Utah, 120,188 of the state's 134,378 private worksites have fewer than 20 employees, and they carry 28.3% of the state's private jobs. The outfitter in Moab, the dental office in Cedar City, the family trucking company in Nephi, the four-person accounting firm in Logan: for those employees, the same sentence is wrong, and wrong in a way that shows up as a bill rather than a penalty. So before anything else, count.

The rule, quoted

The 20-employee line comes from the Medicare secondary payer rules, not from the enrollment rules. 42 CFR § 411.170(a)(2)(i): "An employer is considered to employ 20 or more employees if the employer has 20 or more employees for each working day in each of 20 or more calendar weeks in the current calendar year or the preceding calendar year." Part-timers count as employees. A seasonal outfit that runs 30 people from May through September and six in the winter clears the bar, because 20 calendar weeks is all it takes.

What the line decides is in § 411.172(a): Medicare "benefits are secondary to benefits payable by a GHP" for any month in which you are 65 or older, entitled to Part A, and "covered under a GHP of an employer that has at least 20 employees ... and coverage under the plan is by virtue of the individual's current employment status." Turn that sentence around and you have the small-employer rule. If the employer has fewer than 20, Medicare is not secondary. It is primary, from the first day of the month you turn 65, and it is primary whether or not you signed up for it.

The large-employer side comes with protections. § 411.170(a)(2)(ii) says the plan "may not take into account the Medicare entitlement of" an active employee 65 or older, and § 411.108(a) lists what that forbids: "Offering coverage that is secondary to Medicare to individuals entitled to Medicare," "Imposing limitations on benefits for a Medicare entitled individual that do not apply to others," "Charging a Medicare entitled individual higher premiums," and, item (9), "Providing misleading or incomplete information that would have the effect of inducing a Medicare entitled individual to reject the employer plan." A large employer that tells you to go get Medicare at 65 is breaking that rule. A small employer that tells you the same thing is describing the law accurately.

The decision by employer size

Sources: 42 CFR § 411.172; § 411.104; § 407.20; SSA POMS HI 00805.266; Medicare.gov, Working past 65.

The small-employer trap is a bill, not a penalty

This is the sentence to get exactly right, because most of what is written about it is slightly wrong in a way that matters. The Special Enrollment Period is defined in 42 CFR § 407.20, and its condition is that "When first eligible for SMI coverage ... they were covered under a GHP or LGHP on the basis of current employment status," where, for someone 65 or over, "coverage must be by reason of the current employment status of the individual or the individual's spouse." There is no headcount in it. The definition of a group health plan in § 411.101 has no headcount either, and Social Security's own manual, POMS HI 00805.266, says it flatly: "The GHP can be of any size."

So the employee at a 12-person firm who stays on the company plan past 65 and never enrolls in Part B does get a Special Enrollment Period later, and does not pay the 10% surcharge. What they lose is different and usually larger. From the month they turned 65, Medicare was the primary payer. The company plan, which is not bound by § 411.108 because the employer is under 20, is allowed to pay as a secondary plan, which means paying what would be left after Medicare paid its share. If Medicare paid nothing because you were not enrolled, that share is not paid by anyone. On a $40,000 hospital stay, Medicare's share is most of the bill. Medicare.gov's instruction on the working-past-65 page is the right first step: "Ask the employer that provides your health insurance if you need to sign up for Part A (Hospital Insurance) and Part B (Medical Insurance) when you turn 65." At a small employer, the honest answer is yes to both.

There is a second way to end up on the wrong side of this at a large employer. § 411.172(c): "An employee or spouse may refuse the health plan offered by the employer. If the employee or spouse refuses the plan— (1) Medicare is primary payer for that individual; and (2) The plan may not offer that individual coverage complementary to Medicare." Drop the work plan at 65 to save the payroll deduction and you have to have Medicare, in full, because the employer cannot legally sell you a wrap-around.

What "current employment status" excludes

The whole large-employer exception rests on three words, and 42 CFR § 411.104 defines them narrowly. You have current employment status if you are "actively working as an employee," are "the employer (including a self-employed person)," or are not actively working but retain "employment rights in the industry" with a job that "has not had his employment terminated by the employer," and have "GHP coverage that is not pursuant to COBRA continuation coverage." Three consequences follow.

COBRA is not current employment. The job ended; the coverage is a legal continuation of it. Medicare.gov says the 8-month clock starts "when you stop working (or lose insurance), even if you choose COBRA or other coverage that's not Medicare." Eighteen months of COBRA is ten months past the end of the Special Enrollment Period. Retiree coverage is not current employment for the same reason, even when it comes from the same employer and looks like the plan you had. A self-employed person is only covered "by virtue of current employment status," under § 411.104(d), if last year's net earnings from the business met the Social Security self-employment floor, and Social Security adds that the plan must be one available to employees, not a policy "that only covers self-employed individuals." A sole proprietor on an individual Marketplace plan has no employer coverage to delay behind and should enroll at 65.

What the delay costs

Two clocks, two penalties. For Part B, 42 CFR § 408.22 says the standard premium "is increased by ten percent for each full twelve months" you were eligible and unenrolled without a Special Enrollment Period. The 2026 standard premium is $202.90 per the CMS fact sheet, so a one-year gap is $20.29 a month and a two-year gap is $40.58, added to every premium for the rest of your life and recalculated upward each time the standard premium rises. Someone who retires at 68 without having had employer coverage since 65 pays roughly $730.44 a year extra at 2026 rates, before any IRMAA surcharge.

For drug coverage the clock is shorter and the penalty smaller. Medicare.gov: "Don't go 63 days or more without creditable drug coverage (coverage that's similar in value to Part D)." The penalty is 1% of the national base beneficiary premium, $38.99 in 2026, for each uncovered month: about $4.70 a month after a year, for life. Most employer plans are creditable, but the employer has to tell you in writing each year, and a high-deductible plan paired with an HSA sometimes is not. Ask for the notice. If your plan is not creditable, that 63-day clock is already running on your 65th birthday, large employer or not.

Part A and the HSA

Medicare.gov's working-past-65 page: "If you don't have to pay a premium for Part A (Hospital Insurance), you can choose to sign up when you turn 65 (or anytime later)." At a large employer, taking premium-free Part A at 65 is harmless; it pays second behind the group plan for a hospital stay. The exception is a Health Savings Account. POMS HI 00805.266 says in capitals that "Health Savings Accounts (HSAs) are NOT group health plans," and enrolling in any part of Medicare ends your eligibility to contribute. Medicare.gov's instruction is specific: "If you have a Health Savings Account (HSA), you and your employer should stop contributing to your HSA 6 months before you retire or apply for benefits from Social Security," because Part A is backdated up to six months when you apply. If you are funding an HSA at a large employer, the clean answer is to delay Part A and Part B together and take both with the Special Enrollment Period. Our HSA post has the six-month arithmetic and the excise tax for getting it wrong.

Why the answer is different in Utah

The Bureau of Labor Statistics counts every private worksite in the state by the number of people on its payroll. The 2025 first-quarter file, the most recent size breakdown, looks like this for Utah.

Source: BLS Quarterly Census of Employment and Wages — establishments by size class, Utah, private, 2025 Q1. Worksites, not firms: a company with three small locations appears three times, so the true share of employers under the Medicare line is somewhat lower than the worksite share.

Read the top three rows together: 120,188 worksites, 89.4% of the total, with fewer than 20 employees, and 411,941 jobs, 28.3% of the private total, inside them. The Medicare rule counts the employer's whole headcount, not the location's, so a branch of a large company is on the large-employer side even if the branch is small. But in the rural counties where we work, the worksite usually is the employer. The practical rule I give people is simple: if you can name everyone who works there, assume you are under 20 and enroll in both parts in your Initial Enrollment Period. If you cannot, ask HR for the count under § 411.170 and get the answer in writing.

The other side of the ledger is how many Utahns this touches. In June 2026 the state had 490,235 Medicare beneficiaries, 449,177 of them aged 65 or older. In Grand County, 33.3% of adults live with high blood pressure and 11.2% with diabetes, per CDC PLACES, which are the conditions that produce the routine claims a primary-payer gap turns into bills. The employer-size question is not abstract for someone with a standing prescription and a cardiologist.

What I would do, in order

Three months before your 65th birthday, count the employer's employees, including part-timers, over the past two calendar years. Under 20: enroll in Part A and Part B during the seven-month Initial Enrollment Period, keep the work plan if it is worth the premium as a secondary payer, and ask the plan for its creditable-coverage notice for drugs. Twenty or more: take premium-free Part A unless you fund an HSA, delay Part B, keep the creditable-coverage notice each year, and write down the retirement date, because the 8-month Special Enrollment Period starts the month after the job or the coverage ends, and COBRA does not extend it. Either way, if you are a spouse covered on someone else's plan, the same test applies to their employer; our spouse's-plan post covers that version.

How we know all this: the Medicare On Main Data Desk frames every article with public data — here, 42 CFR §§ 411.170, 411.172, 411.108, 411.104 and 411.101 for the 20-employee test, the payment order, the prohibited "taking into account" actions and the definition of current employment status; 42 CFR § 407.20 for the Special Enrollment Period's conditions and § 408.22 for the 10% increase, all quoted as published on Cornell LII; SSA POMS HI 00805.266, .270 and .275 for "The GHP can be of any size," the HSA sentence and the 8-month mechanics; Medicare.gov's working-past-65 and costs pages; the CMS fact sheet of November 14, 2025 for the 2026 Part B premium; the BLS Quarterly Census of Employment and Wages 2025 Q1 size file for Utah worksites and jobs by size class; the CMS Medicare Monthly Enrollment file for Utah (June 2026); and CDC PLACES county data (2023). The penalty figures are arithmetic on the published premium, not a quote. No product or carrier is named or recommended. This is education, not advice; confirm your employer's headcount with your employer, and plans, costs and eligibility with a licensed agent or Medicare.gov. We take no payment from any carrier to feature a plan.