An HRA is a group health plan, and that single fact drives most of its design. The regulation at 26 C.F.R. 54.9815-2711(d)(6)(i) defines an account-based group health plan as "an employer-provided group health plan that provides reimbursements of medical care expenses with the reimbursement subject to a maximum fixed dollar amount for a period," and says in terms that "an HRA is a type of account-based group health plan." Being a group health plan means the Affordable Care Act's market reforms apply, including the bar on annual dollar limits for essential health benefits and the requirement to cover preventive services without cost sharing. An arrangement that pays a fixed dollar amount cannot satisfy those requirements by itself, which is why an HRA generally has to be integrated with other coverage that does. There are two integration routes: with the employer's own group health plan, which is the traditional design, or with individual health insurance coverage or Medicare, which is the individual coverage HRA.
The same regulation draws the boundary for the whole family. After defining the category it adds: "an account-based group health plan does not include a qualified small employer health reimbursement arrangement, as defined in section 9831(d)(2)." The statute is blunter still, providing at section 9831(d)(1) that "the term 'group health plan' shall not include any qualified small employer health reimbursement arrangement." So an ordinary HRA and an individual coverage HRA are group health plans, and a QSEHRA is expressly not one. Almost every difference between them, which market reforms apply, whether integration with other coverage is required, and whether Congress had to cap the arrangement in dollars, falls out of that line.
Four species, and where each is defined. The traditional integrated HRA is the arrangement Notice 2002-45 describes, sitting alongside the employer's own group health plan, with no statutory dollar cap. The individual coverage HRA at 26 C.F.R. 54.9802-4 is integrated instead with the employee's own individual coverage or with Medicare, and likewise has no statutory cap. The qualified small employer health reimbursement arrangement at Internal Revenue Code section 9831(d) is the one that is not a group health plan at all, and it is capped in dollars by statute with the cap indexed each year. And an excepted benefit HRA, defined at 26 C.F.R. 54.9831-1(c)(3)(viii), is a narrower arrangement treated as a limited excepted benefit rather than as coverage, which is a separate subject this site does not yet cover.
What an HRA may and may not reimburse. Notice 2002-45 restricts benefits to expenses for medical care as defined in section 213(d), each of which must be substantiated. It may not reimburse an expense that was deducted under section 213 in a prior year, nor one incurred before the HRA existed or before the employee enrolled. It may reimburse premiums for accident or health coverage, including for current employees, retirees and COBRA qualified beneficiaries, which is why an HRA is a natural vehicle for retiree health benefits. And the notice is strict about cash: an HRA does not qualify for the income exclusion "if any person has the right to receive cash or any other taxable or non-taxable benefit under the arrangement other than the reimbursement of medical care expenses," and where that right exists every distribution to everyone becomes taxable, including the ones that did reimburse real medical bills.
Who may be covered, and who may not. Reimbursements are excludable for current and former employees, including retirees, their spouses and dependents, and the spouses and dependents of deceased employees. The notice then closes a door small-business owners walk into constantly: "the term 'employee' does not include a self-employed individual as defined in § 401(c)." A sole proprietor and a partner are self-employed individuals under that section, so an HRA cannot give them tax-free reimbursements on their own account. An owner working through an S corporation lands in the same place by a different route: section 1372 provides that for employee fringe benefit purposes the S corporation is treated as a partnership and any shareholder owning more than 2 percent of its stock is treated as a partner.
A vocabulary trap worth naming. Notice 2002-45 also says that where the maximum reimbursement reasonably available is not substantially in excess of the value of the coverage, an HRA is a flexible spending arrangement as defined in section 106(c)(2). That is a different statutory phrase from the health flexible spending account most people mean, which is a salary-reduction benefit inside a cafeteria plan under section 125. The two share a name and almost nothing else: one is funded by the employer and can carry forward, the other is funded by the employee's own salary and is subject to the use-it-or-lose-it rule.