Three Arrangements, One Rule That Governs Them
Retiree HRAs, Medicare HRAs and spousal incentive arrangements all do the same underlying thing: move a population, and its claims, off the group plan while leaving those people with something of value. Whether you may do it, and how, turns almost entirely on one threshold.
The 20-Employee Line
Medicare Secondary Payer rules determine who pays first when an employee is Medicare-eligible, and the answer flips at twenty employees.
For a longer view of cost, see how a year-round health and cost strategy works between renewals.
| Employer size | Who pays first | Can an HRA reimburse Medicare premiums? |
|---|---|---|
| Fewer than 20 employees | Medicare | Generally yes — Medicare is already primary |
| 20 or more employees | The group health plan | Generally no — it would be an incentive to leave the plan |
The reasoning behind the rule is straightforward: Congress did not want employers shifting cost onto Medicare by encouraging older workers off the group plan. At 20 or more employees, offering that incentive is prohibited, and the exposure falls on the employer rather than the employee.
Where reimbursement is permitted, Part B, Part D and Medicare Supplement premiums qualify. Part A premiums do not, though most people owe no Part A premium.
Retiree-Only HRAs Sit Outside the Usual Constraints
This is the part worth knowing, because it runs against everything else in this area. A standalone HRA for active employees fails ACA market reforms — the rule that makes most general-purpose reimbursement arrangements unlawful. A retiree-only plan is not subject to those reforms.
The practical effect is that an employer can fund a retiree HRA on its own terms, without pairing it to a group plan and without fitting it into an ICHRA or QSEHRA structure. For an employer carrying a retiree medical obligation, it converts an open-ended promise into a defined contribution, which is the difference between a liability that grows with medical trend and one you set.
The Spousal Incentive Arrangement
A spousal incentive HRA reimburses part of the cost for an employee’s spouse to take coverage through their own employer instead of joining yours. The employer pays a portion of the spouse’s premium, and in exchange that person and their claims leave the group.
On a plan where spousal claims are a visible share of spend, this is often the cheapest structural change available — you are paying a fraction of another employer’s premium rather than absorbing the claims yourself. It only works where the spouse genuinely has an offer of their own, so it is worth establishing that before designing around it.
What to Check Before Designing Any of These
- Count your employees against the 20 threshold — this single number decides what is permitted.
- Confirm whether the population is genuinely retired. A retiree-only plan means retirees, not older active employees.
- For a spousal arrangement, establish how many spouses actually have coverage available elsewhere.
- Remember that an HRA is a group health plan in its own right — plan document, ERISA and COBRA rights all attach, as covered in our guide to medical expense reimbursement plans.
- Check the interaction with HSA eligibility if any of the population still contributes to one.
Group retiree medical is something we place, and the design question is usually less about which arrangement than about which population you are actually trying to move and whether the rules let you. That is a short conversation once we know your headcount.
Questions We Get
Can an employer reimburse an employee’s Medicare premiums?
It depends entirely on headcount. An employer with fewer than 20 employees generally can, because Medicare is the primary payer for that group. An employer with 20 or more generally cannot, because Medicare Secondary Payer rules prohibit offering a financial incentive for a Medicare-eligible employee to leave the group plan.
What is the 20-employee line under Medicare Secondary Payer rules?
Below 20 employees, Medicare pays first and the group plan is secondary. At 20 or more, the group plan pays first and Medicare is secondary. The rule exists to stop employers shifting cost onto Medicare, and it is why the same arrangement is permitted at one employer and prohibited at another.
Which Medicare premiums can be reimbursed?
Where reimbursement is permitted, Part B and Part D premiums qualify, as do Medicare Supplement premiums. Part A premiums do not — though most people have no Part A premium, so this rarely bites in practice.
Is a retiree-only HRA allowed as a standalone arrangement?
Yes, and this is the important distinction. A standalone HRA for active employees fails ACA market reforms. A retiree-only plan sits outside those reforms, so it can operate on its own without being paired with a group plan — which makes it one of the few genuinely flexible tools left.
What is a spousal incentive HRA?
An arrangement reimbursing part of the cost for an employee’s spouse to take coverage through their own employer, rather than joining yours. The employer pays a share of the spouse’s premium and removes that person, and their claims, from the group. For a plan carrying expensive spousal claims it can be the cheapest change available.
Can an employer just drop older employees onto Medicare to save money?
No. At 20 or more employees that is precisely what Medicare Secondary Payer rules prohibit, and the exposure is not trivial — it reaches the employer rather than the employee. Coverage has to be offered on the same terms regardless of Medicare eligibility.
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