What Is a Business Affiliate? Control, Thresholds, and Legal Impact

A business affiliate is a company or person that controls, is controlled by, or shares common control with another entity.¹ The relationship is defined by control, meaning the power to direct another entity’s management and policies through stock ownership, contracts, or other arrangements. Different federal agencies apply different ownership thresholds depending on the regulatory context, so two companies can be affiliates under one law and independent under another.

What Control Really Means

Owning more than 50 percent of a company’s voting stock is the clearest way to establish control, but it is not the only way.¹ A party with a smaller stake can still qualify as an affiliate if it holds board seats, management contracts, or veto rights over key decisions. Regulators care about who actually calls the shots, not just the number on the cap table.

Control comes in two forms. Affirmative control is the straightforward version: one party guides another’s operations or strategy through majority voting shares, board representatives, or a management contract. If an entity has the legal right to steer the business, it is an affiliate regardless of how often it uses that right.

Negative control is subtler. It exists when a minority owner can block ordinary business actions, such as preventing the board from reaching a quorum, vetoing new debt, or blocking the submission of a legal claim to arbitration. The ability to stop a company from doing routine business is enough to create affiliation. The SBA draws a line, though: a minority owner who can only block truly extraordinary events, like dissolution, merger, admitting new equity holders, or filing for bankruptcy, does not trigger negative control.² Those are treated as standard investor protections.

Ownership Thresholds Change With the Law

Because every agency defines affiliation for its own purposes, the percentage that matters depends on which rule you are asking about:

FTC fair credit rules treat a company as an affiliate if another entity owns or controls 25 percent or more of its voting shares, controls the election of a majority of its directors, or exercises a controlling influence over its management.³
Under the Hart-Scott-Rodino merger notification rules, an entity is an affiliate when another person holds 50 percent or more of its voting securities or has the contractual power to designate 50 percent or more of its directors.⁴
For consolidated federal tax returns, the IRS requires a parent to own at least 80 percent of a subsidiary’s voting power and at least 80 percent of its stock value.⁵

The same ownership stake can trigger an affiliation for small-business eligibility but fall short of the IRS standard for joint filing. If you are trying to figure out whether two companies are affiliates, the first question is always: affiliates for what purpose?

When Operations Create Affiliation Without Ownership

Ownership is not the only path. The SBA and other agencies look at how businesses actually operate to decide whether they function independently or as a single economic unit.

Family Ties

The SBA presumes that companies owned or controlled by close family members, including spouses, civil-union partners, parents, children, and siblings, are affiliates if they conduct business together, share resources, exchange loans, or use the same employees or locations.² A business can rebut this presumption by showing a clear separation between the two companies. More distant family relationships, like cousins or in-laws, do not trigger the presumption on their own.

Economic Dependence

When a company derives 70 percent or more of its revenue from a single other company over the previous three fiscal years, the SBA presumes the two are affiliated.² A newer business with few contracts can rebut the presumption, and so can a company whose contracts leave it free to sell to other buyers. An established firm earning nearly all its income from one source will have a harder time arguing independence.

Shared Resources and Overlapping Leadership

Companies that share facilities, equipment, or employees without a genuine, market-rate agreement look like a single operation to regulators. Free or deeply discounted office space, administrative support, or staffing between businesses signals that they are functioning as one.² The same goes for interlocking leadership: when the same people serve as officers or directors across multiple companies, those companies are generally treated as affiliates because the overlap signals coordinated decision-making.

Common Affiliate Structures

Most affiliations come from hierarchical ownership. A parent company that holds a majority stake in a subsidiary is its affiliate, with economic control flowing from parent to subsidiary while each entity keeps its own legal identity. Under SEC rules, a subsidiary whose parent owns more than 50 percent of its voting stock is a “majority-owned subsidiary.”¹

Sister companies, which do not own shares in each other but answer to the same parent, are also affiliates of each other through their shared controlling party. Holding companies add further layers by owning the voting securities of several operating companies, and every entity in the chain is affiliated with the others. Regulators look through the layers to find the ultimate source of control.

Why Being an Affiliate Matters

Affiliation changes legal obligations across several areas of law. The consequences can be significant, even for businesses that view themselves as independent.

Small-Business Eligibility

The SBA determines whether a company qualifies as “small” by combining the revenue and employee counts of the applicant and all its affiliates, both domestic and foreign.⁶ A company that looks small on its own may be disqualified once its affiliates’ numbers are added in. This aggregation applies to government contracting set-asides, SBA loans, disaster assistance, and surety bond programs.

Several relationships are carved out and do not create affiliation on their own:²

Approved SBA mentor-protégé relationships
Employee leasing arrangements and the use of professional employer organizations
Businesses substantially owned by licensed Small Business Investment Companies
Businesses owned by Indian Tribes, Alaska Native Corporations, Native Hawaiian Organizations, or Community Development Corporations, when the only connection to another business is common ownership by the same organization

Taxes

An affiliated group whose parent owns at least 80 percent of the voting power and value of a subsidiary can file a consolidated federal income tax return, letting the group offset one member’s losses against another’s profits.⁵ Transactions between members of a consolidated group are subject to special timing rules designed to make the group’s taxable income match what it would have been if the members were divisions of a single corporation.⁷

A separate “controlled group” test governs employee benefit plans. All employees of corporations in a controlled group are treated as a single employer for retirement plan eligibility, vesting, and contribution limits.⁸ A parent-subsidiary controlled group exists when one corporation owns at least 80 percent of the voting power or stock value of another, and a brother-sister controlled group exists when five or fewer individuals, estates, or trusts own more than 50 percent of each corporation, counting only the ownership that is identical across them.⁹ If you own multiple businesses that form a controlled group, you cannot offer a generous retirement plan to employees of one while leaving out the others.

Joint Employer Liability

Under the Fair Labor Standards Act, “employ” is defined broadly to include allowing or permitting someone to work.¹⁰ When two affiliated companies share control over the same worker’s job, they can be treated as joint employers. The worker’s hours across both companies are combined for overtime, and both companies are individually and jointly responsible for wage-and-hour compliance. Joint employment is especially likely when affiliates share facilities or equipment, coordinate scheduling, or move employees between related companies.¹¹ Shifting staff between affiliates without tracking total hours is a common path to overtime violations.

Merger Notification

The Hart-Scott-Rodino Act requires companies to notify the FTC and DOJ before completing certain large acquisitions.¹² The statute defines a “person” as an ultimate parent entity together with everything it controls, so the assets and voting securities of all affiliates count when figuring out whether a deal crosses the reporting threshold. A company that looks below the line on its own can be pulled above it once its affiliates’ holdings are included.

Disclosure

Publicly traded companies must list their subsidiaries in Exhibit 21 of their annual Form 10-K, identifying each subsidiary, its jurisdiction of incorporation, and any names it uses to do business.¹³ Companies applying for SBA loans or federal contracts must also disclose their affiliates, and because the SBA aggregates size across affiliated entities, failing to reveal one can lead to a finding of size misrepresentation, with consequences ranging from denial of the loan or contract to civil penalties for making false statements to a federal agency.⁶

A Note on Affiliate Marketing

“Affiliate” shows up in two very different business contexts. A corporate affiliate, the kind described here, is an entity linked to another through ownership or control. An affiliate marketer is typically an independent contractor who earns a commission for promoting another company’s products. The two share a label and nothing else legally. An affiliate marketer has no ownership stake, no board seats, and no ability to influence management. If you are researching obligations tied to shared ownership or control, affiliate marketing arrangements do not apply.

Keeping Affiliates Legally Separate

Separate legal entities within an affiliated group generally cannot be held liable for each other’s debts. Each corporation, LLC, or subsidiary is its own legal person, and owners are ordinarily protected from the obligations of the entities they control. Courts will set that protection aside, however, when a controlling party treats an affiliate as an extension of itself rather than as an independent entity. The doctrine is commonly called piercing the corporate veil.

Courts weigh several factors: whether the affiliate was severely underfunded from the start, whether owners commingled personal and corporate funds, whether corporate formalities like separate board meetings and financial records were observed, and whether the structure was used to commit fraud or evade existing legal obligations. No single factor decides the case, and the standard varies by state, but the core question stays constant: did the controlling party respect the affiliate’s separate existence, or treat its assets and operations as its own?

The practical lesson for anyone running affiliated businesses is to maintain genuine independence between them. Separate bank accounts, real board meetings, accurate records, and clear boundaries between parent and subsidiary are what make the liability protections hold up when they are tested.

1
eCFR. 17 CFR 230.405 – Definitions of Terms
2
eCFR. 13 CFR 121.103 – How Does SBA Determine Affiliation
3
eCFR. 16 CFR 680.3 – Definitions
4
Federal Trade Commission. Sec 801.1 – Definitions
5
Office of the Law Revision Counsel. 26 USC 1504 – Definitions
6
eCFR. 13 CFR Part 121 – Small Business Size Regulations
7
eCFR. 26 CFR 1.1502-13 – Intercompany Transactions
8
Office of the Law Revision Counsel. 26 USC 414 – Definitions and Special Rules
9
Office of the Law Revision Counsel. 26 USC 1563 – Definitions and Special Rules
10
Office of the Law Revision Counsel. 29 USC 203 – Definitions
11
GovInfo. 29 CFR 791.2 – Joint Employment
12
Office of the Law Revision Counsel. 15 USC 18a – Premerger Notification and Waiting Period
13
eCFR. 17 CFR 229.601 – Item 601 Exhibits