Common Ownership and the ALE Determination
The Affordable Care Act's employer mandate applies to Applicable Large Employers (ALEs) — those with 50 or more full-time equivalent employees — but determining whether a business crosses that threshold is not always a single-entity calculation. When related businesses share common ownership or operate under certain organizational arrangements, Internal Revenue Code rules require that their employees be counted together before any ALE determination is made. Understanding how these aggregation rules interact with the ALE threshold is essential for compliance across corporate families, franchise networks, and multi-entity ownership structures.
Definition and scope
Under Internal Revenue Code (IRC) Section 414, employers that are part of a "controlled group" or "affiliated service group" must aggregate their employee counts for purposes of the ALE determination under IRC Section 4980H. The regulatory context for ACA compliance traces directly to Treasury Regulation §54.4980H-1 and §54.4980H-2, which incorporate Section 414 by reference and make aggregation a mandatory step — not an optional one — before any employer concludes it falls below the 50 full-time equivalent threshold.
The scope of entities subject to this rule is broad:
- Parent-subsidiary controlled groups — a parent corporation owns at least 80% of one or more subsidiary entities (IRC §1563(a)(1))
- Brother-sister controlled groups — 5 or fewer individuals, estates, or trusts own at least 80% of each entity and more than 50% of each entity considering only overlapping ownership (IRC §1563(a)(2))
- Combined groups — a group of entities that includes both a parent-subsidiary and a brother-sister arrangement
- Affiliated service groups — entities linked through service relationships rather than direct equity ownership, governed by IRC §414(m)
Each category carries distinct ownership thresholds and logic, and the distinctions matter because a business might fall inside one category but outside another.
How it works
The aggregation process for ALE determination follows a structured sequence:
- Identify all related entities. Map every entity in which the owners hold equity interests, including minority stakes that could contribute to the controlled group tests.
- Apply the ownership percentage tests. For parent-subsidiary groups, the 80% ownership test is applied up and down the ownership chain. For brother-sister groups, both the 80% common ownership test and the 50% identical ownership test must be satisfied simultaneously.
- Include affiliated service groups. Even without majority equity ownership, entities that regularly associate to perform services for third parties, or that significantly perform services for each other, may be aggregated under IRC §414(m).
- Count all employees across the aggregated group. Full-time employees and full-time equivalent employees from every member of the controlled group are added together as if they were employed by a single employer.
- Apply the 50 full-time equivalent threshold. If the combined count reaches 50 or more, every member of the group is an ALE individually — including members that, standing alone, would have fewer than 50 employees.
This last point is critical: ALE status attaches to each member entity separately, meaning each must comply with offer-of-coverage requirements and reporting obligations on its own, even though the size determination was made at the group level. The IRS confirmed this treatment in IRS Publication on ACA employer provisions and through final regulations published in the Federal Register (79 Fed. Reg. 8544 (Feb. 12, 2014)).
Common scenarios
Franchise arrangements. A franchisor and franchisee are generally treated as separate employers for ALE purposes unless a controlled group relationship exists. The IRS has specifically addressed this in the preamble to the final 4980H regulations: the franchise relationship itself does not create aggregation, but if the franchisor owns 80% or more of a franchisee's equity, the entities must be aggregated. Many national franchise systems involve no equity overlap between franchisor and franchisee, placing them outside controlled group treatment.
Family-owned businesses. Attribution rules under IRC §1563(e) apply stock owned by spouses, children, grandchildren, and parents in certain circumstances. A spouse's ownership stake is typically attributed to the other spouse, which can unexpectedly create controlled group membership even where the spouses operate wholly separate businesses. An individual owning 40% of Company A and 45% of Company B may not form a controlled group on those figures alone — but spousal attribution could push the effective ownership above the 80% threshold.
Private equity and fund structures. Investment funds holding majority stakes in portfolio companies can create controlled groups spanning completely unrelated industries. Fund-level ownership of 80% or more in two or more operating companies triggers aggregation of those companies' employees. A fund managing portfolio companies in retail, manufacturing, and hospitality — each with 30 employees — would produce an aggregated count of 90 full-time equivalents, making each portfolio company an ALE.
Staffing and professional employer organizations (PEOs). Co-employment arrangements introduce complexity because the common law employer — not necessarily the entity listed on the payroll — determines which entity's employees are counted. The IRS has addressed this in Notice 2013-54 and related guidance.
Decision boundaries
The line between aggregation and non-aggregation turns on specific ownership percentages, not operational relationships. Two businesses sharing a name, bank account, or management team are not automatically a controlled group; the statutory tests require documented equity ownership at or above the applicable thresholds.
A comparison of the two primary tests illustrates the distinction:
| Test | Entities Covered | Ownership Threshold |
|---|---|---|
| Parent-subsidiary | Chain with ≥80% ownership at each link | 80% at each tier |
| Brother-sister | 2+ entities, same 5-or-fewer owners | 80% common + 50% identical |
An entity that passes neither test and is not an affiliated service group stands alone for the employee count. The full framework governing ALE determination hinges on this aggregation analysis before any employee headcount arithmetic begins.
When an entity's status is ambiguous — for example, where ownership is spread across trusts, estates, or indirect holdings — the analysis requires reference to IRC §318 attribution rules, which layer onto the §1563 tests and can expand the ownership universe significantly. A complete picture of how controlled group rules fit within the ACA employer mandate is available through the ACA authority homepage and supplementary IRS guidance at IRS.gov.
References
- IRC §4980H — Shared Responsibility for Employers Regarding Health Coverage (U.S. House, Office of Law Revision Counsel)
- IRC §414 — Definitions and Special Rules (U.S. House, Office of Law Revision Counsel)
- IRC §1563 — Definitions and Special Rules for Controlled Groups (U.S. House, Office of Law Revision Counsel)
- Treasury Final Regulations — Shared Responsibility for Employers, 79 Fed. Reg. 8544 (Feb. 12, 2014) (IRS)
- IRS Notice 2013-54 — Application of Market Reform and Other Provisions
- IRS — Affordable Care Act: Information for Employers
The law belongs to the people. Georgia v. Public.Resource.Org, 590 U.S. (2020)