Subsidiary vs affiliate: why the definition depends on the question

Key takeaways

• A subsidiary is a company controlled by another entity. “Affiliate” covers a wider set of relationships. Under US SEC Rule 405, it includes an entity that controls, is controlled by or shares common control with the specified entity. A controlled subsidiary therefore qualifies in that rule’s scope.
• Ownership percentages answer only the questions their governing rules ask. Voting and contractual rights can shape control, while reporting and tax rules apply their own tests.
• Sister companies can be affiliates through a shared controller even when neither controls the other. Under IFRS accounting, an associate involves significant influence without control.
• For an agreement, check the named entity, signatory authority and supporting records. A group label alone cannot assign an obligation.

The difference between a subsidiary and an affiliate

A subsidiary describes a control relationship. An affiliate is a wider label that can capture control in either direction or common control, depending on the source that uses it. Use the definition set by the question before treating either term as a fixed company category.

What a subsidiary is

A subsidiary is a company controlled by another entity, commonly called its parent. The parent may exercise that control directly or through another entity in the group. Under the US SEC’s Rule 405, a subsidiary is an affiliate controlled directly or indirectly by the specified person. SEC Rule 405

Control defines the relationship. A mere investment or commercial arrangement does not establish a subsidiary. Under Rule 405, power may arise through voting securities, contract or other means; an ownership figure alone cannot settle that control question.

For example, a company that controls another company can be described as the parent, while the controlled company is the subsidiary. The terms identify the direction of control; they do not by themselves determine the reporting treatment, tax result or contractual obligations that a separate source may govern.

What an affiliate is

An affiliate is a relationship label with a wider reach than “subsidiary.” In the SEC’s Rule 405 definition, it covers an entity that controls, is controlled by, or is under common control with the specified entity. SEC Rule 405

A parent and its controlled subsidiary fall within that definition. So do two companies controlled by the same parent. These sister companies, also called fellow subsidiaries, share a controller without controlling each other.

Because the word can be defined for a particular legal, reporting or commercial purpose, read the definition in the document you are using. It may cover a broader or narrower set of relationships than the everyday description of companies in the same corporate group.

Why a subsidiary can also be an affiliate

Yes, a subsidiary can also be an affiliate when the applicable definition includes entities that are controlled by the specified company. Rule 405 does exactly that: its subsidiary definition places a company controlled directly or indirectly by the specified person inside the affiliate relationship.

“Subsidiary” identifies the controlled side of the relationship. Under Rule 405, that company is also an affiliate. Two sister companies may likewise be affiliates of each other, although neither is the other’s subsidiary.

Comparison table: subsidiary vs affiliate

This table uses the SEC Rule 405 definitions as a focused example. A tax rule, reporting standard or agreement can define the terms differently.

Point of comparison	Subsidiary	Affiliate
Core relationship	The entity is controlled directly or indirectly by the specified company.	The entity controls, is controlled by, or is under common control with the specified company.
Direction of control	Identifies the controlled company in the relationship.	Can describe the controller, the controlled company or a company connected through common control.
Relationship breadth	A specific control relationship.	A broader relationship set that includes a controlled subsidiary in this definition.
Sister-company example	One sister company is not the other’s subsidiary merely because they share a parent.	Each sister company can be an affiliate of the other through their common controller.

Use “subsidiary” when you need to identify the controlled entity. Use “affiliate” only after checking the definition that applies to the document or decision in front of you.

Map the relationship before using the label

Start with a map of who controls whom. It separates a parent-to-subsidiary relationship from two companies connected only by a shared controller, and from an investment that gives influence without control. That map gives you the right relationship to test under the relevant rule.

The diagram separates control, common control and significant influence. Those relationships require different assessments; the lines do not imply ownership percentages.

Parent and controlled subsidiary

A parent company sits on the controlling side of the relationship; a subsidiary sits on the controlled side. In the SEC’s Rule 405 terminology, a parent is an affiliate that controls the specified person, directly or indirectly, while the controlled company is a subsidiary.

The control path can run through more than one entity. For example, Parent A may control Holding B, which controls Operating C. When the relevant definition recognizes indirect control, A can be the parent in relation to C even though B stands between them in the corporate structure.

Map the entities and the direction of control before relying on the labels in an agreement, report or internal record. The chart identifies the relationship; the governing document determines how that relationship matters for the decision at hand.

Sister companies under common control

Sister companies sit beside each other in the corporate structure because the same parent or other controller controls both. Each company may be a subsidiary of that common controller, but one sister company does not become the other’s parent simply because they belong to the same group.

In the Rule 405 frame, common control can make the two companies affiliates of each other. That result follows from their relationship to the shared controller, rather than from a control line running from one sister company to the other.

For example, if Parent A controls Subsidiary B and Subsidiary C, B and C are fellow subsidiaries. A chart should show two control lines from A, then treat B and C as connected through common control. This distinction matters when a form, disclosure or agreement uses “affiliate” but does not name a particular group entity.

Associate and significant influence

Under IAS 28, an associate is an entity over which an investor has significant influence. The investor participates in financial and operating policy decisions without controlling or jointly controlling those policies.

On a relationship map, draw the link to an associate as influence rather than control. The investor has a role in the relevant decisions, yet the associate does not become its subsidiary on that basis.

This is a distinct accounting concept, so do not use “associate” as a casual replacement for “affiliate.” It identifies the type of influence IAS 28 addresses; the document you are applying may use affiliate for a different defined relationship.

Affiliate marketing is a different use of the word

Affiliate marketing uses “affiliate” for a referral arrangement. The FTC describes an affiliate link as one through which the person placing it is paid for purchases made through it.

That usage concerns a promotional relationship between a publisher and a seller. It does not identify a parent, subsidiary, sister company or associate, and it should stay outside a corporate-structure analysis.

Read the surrounding language before assigning a meaning. A marketing page may discuss an affiliate program or affiliate links, while a securities filing, financial statement or group agreement may use the same word to describe corporate relationships.

How control and ownership apply to the question

Ownership can be evidence of control, but it is not a universal shortcut to the answer. Identify the decision rights, the governing source and the purpose of the assessment before relying on a percentage.

Ownership, voting rights and decision-making power

An ownership stake may carry voting rights that shape who directs a company’s management and policies. In SEC Rule 405, control may arise through voting securities, by contract or through other means. The relevant question is who has the power the definition requires, rather than simply who holds the largest economic stake.

The same rule separately defines “majority-owned subsidiary” using more than 50% of securities carrying director-election voting rights. That threshold belongs to this defined term; other subsidiary, affiliate and reporting questions need their own tests.

IFRS reporting applies its own control assessment. IFRS 10 considers power, exposure or rights to variable returns, and the ability to use power to affect those returns. Review the relevant decision rights alongside the ownership record.

Contractual rights and other sources of control

Control may rest on rights outside the share register. SEC Rule 405 includes control through a contract or other means when those rights provide the power to direct management and policies.

That makes the relevant documents part of the assessment. Review the governance agreement, shareholder arrangements and any other instrument that allocates decision-making authority, then identify who can exercise the rights in practice.

The result still depends on the definition you need to apply. A contractual right that matters under one source may not answer a different reporting, tax or agreement question, so keep the document, the purpose and the control test together.

Why the applicable purpose changes the test

“Affiliate” and “subsidiary” do not carry one test across every setting. SEC Rule 405 supplies definitions for its securities-rule and registration-form context. IFRS 10 uses control as the basis for consolidation. A tax rule or agreement may set a different purpose and use different terms or conditions.

Start with the decision you need to make: classification under a corporate rule, financial reporting, tax treatment or an entity-specific obligation. Then locate the governing source and apply its definition to the relevant ownership, voting and contractual rights.

This sequence prevents a label from doing more work than it can support. A conclusion reached for one purpose should stay scoped to that purpose until the rule governing the next question has been assessed.

What changes in reporting, liability and operations

The same group relationship can matter differently in financial reporting, legal liability and day-to-day operations. Keep each question tied to its governing standard, agreement and named entity instead of assuming that one group label settles them all.

Consolidation and related-party reporting

For IFRS reporting, control is the basis for consolidating a parent and its subsidiaries. Consolidated financial statements present them as a single economic entity for reporting purposes. IFRS 10

Consolidation is one reporting question. IAS 24’s related-party framework can include a parent, subsidiary, fellow subsidiary, associate or joint venture. It addresses related-party transactions, outstanding balances and commitments when its conditions apply.

Apply the standard’s scope and exceptions to the facts. IFRS 10 includes an exception for particular subsidiaries of an investment entity, so a control relationship should lead to an assessment rather than an automatic reporting conclusion.

Separate legal identity and liability scope

In the UK government’s business setup guidance, a subsidiary is a separate legal entity from its parent. Its own agreements and records therefore matter when tracing an obligation.

Separate identity does not produce a universal liability answer. In the jurisdiction-specific government guidance behind this example, an existing company generally has no legal liability for a subsidiary’s debts and obligations; the terms and circumstances of a particular case still matter.

Check the named entity, the relevant agreement and the governing law before assigning an obligation within a group. Consolidated reporting and common control describe important relationships, but they do not replace an entity-specific liability analysis.

Tax definitions use their own tests

Tax treatment follows the definition and conditions in the applicable tax law. The corporate vocabulary may look familiar, yet the threshold, eligible entities and ownership chain can be set for that tax purpose alone.

Under US Internal Revenue Code section 1504(a), an affiliated group includes qualifying corporations linked by stock ownership to a common parent. The specified test requires at least 80% of both voting power and stock value. It applies to that tax purpose.

For a tax question, identify the jurisdiction and tax provision first, then apply its conditions to the actual ownership and entity structure. Do not carry a corporate, securities or accounting conclusion into a tax analysis without checking the tax rule that governs it.

The group entity named in an agreement still matters

An agreement needs a named party. “Affiliate” or “group company” can describe a relationship, but it does not by itself identify which legal entity has taken on the particular obligation.

Under the law of England and Wales or Northern Ireland, a person can make a company contract on its behalf when acting with express or implied authority. Companies Act 2006, section 43 The named entity and the signer’s authority therefore belong in the same review.

Consolidated financial statements may present a group as a single economic entity for reporting, but they do not identify an agreement’s signatory. Read the agreement separately, confirm the entity named in it and check the authority under the governing terms and law.

A practical way to assess a group relationship

Use a repeatable sequence: state the question, find the governing document, map the relevant rights and identify the entity to which the answer must apply. This keeps a corporate label from being mistaken for a reporting conclusion, tax result or contractual commitment.

The decision path routes a corporate, reporting, US tax or agreement question to its governing source. Apply that source to the actual entities and documents before reaching a conclusion.

Start with the question and the governing document

Write the decision in one sentence before reviewing an ownership chart. Are you classifying a relationship for a corporate term, determining whether consolidation applies, addressing a tax question or identifying an agreement party? Each route begins with a different governing source.

For an IFRS reporting question, control is the basis for consolidation. IFRS 10 For an agreement question, begin with the named entity, the agreement terms and the authority available to the signatory. For a corporate-definition question, use the scope and wording of the rule that defines the relationship.

When the ownership chart leaves the answer unclear, begin with the decision you need to make and read the document that governs it. Then assess the relevant control rights, rather than trying to make one percentage settle a reporting, tax and agreement question at once.

— Mike Smirnov

This order makes the evidence easier to assess. The cap table remains important, but it becomes one input to the test instead of the test itself.

Identify who controls the relevant decisions

After you identify the governing source, identify the decisions that source treats as relevant and who has the rights to direct them. Rule 405 looks to power to direct management and policies through voting securities, contract or other means. The assessment therefore reaches beyond a list of shareholders.

For an IFRS 10 control assessment, consider the full set of elements: power, exposure or rights to variable returns, and the ability to use power to affect those returns. The standard requires judgment across the facts and circumstances.

Keep the conclusion at the right level. A party may participate in financial and operating policy decisions without controlling them; IAS 28 treats that relationship as significant influence for an associate. Record the relevant decision rights and the document that grants them before assigning the relationship label.

Match the obligation to the contracting entity

When the question concerns an obligation, begin with the legal entity named in the agreement. A group chart can show the relationship around that company, but it cannot substitute for the party designation in the document.

Review the agreement as a set of entity-specific facts: the party name, the obligation in question, the signatory and the authority under which that person signed. In the statutory example used here, authority may be express or implied and is tied to acting on behalf of a particular company.

If another group company appears in the commercial arrangement, keep its role separate until the agreement or another governing document gives it a defined role. This prevents a shared parent, consolidated reporting or an affiliate label from being treated as a substitute for a contracting entity.

Keep the records that support the conclusion

Keep a short record of how you reached the relationship conclusion. The record should make it possible to trace the label back to the governing source, the relevant entity and the rights or facts that answer the question.

For a control assessment, retain the ownership and voting records together with the governance documents and contractual rights reviewed. For an agreement question, keep the agreement, the named party, the signature details and the authority record together.

Add a concise note that states the purpose of the assessment and the conclusion reached for that purpose. When the question changes from reporting to tax or from group mapping to an agreement obligation, start a new assessment against the source that governs the new question.

Common corporate-structure examples

These examples show how the relationship labels fit a corporate map. They are teaching models, so apply the governing rule and the actual documents before using any label for a real group.

A parent and its controlled company

Parent A controls Company B. B is A’s subsidiary, and A is B’s parent. In the Rule 405 terminology used throughout this article, the relationship also places B within A’s affiliates because B is controlled by A.

The control can be direct or indirect. If A controls Holding B and Holding B controls Operating C, the relevant definition may treat A as C’s parent through the chain of control.

This example answers the relationship question only. It does not decide whether A and B consolidate their accounts, share a tax treatment or become parties to each other’s agreements; those outcomes follow the applicable source and the documents involved.

Two sister companies

Parent A controls Studio B and Company C. B and C are sister companies, or fellow subsidiaries, because they share the same controller. Neither one needs to control the other.

Under Rule 405’s common-control language, B and C can each be affiliates of the other. The connection runs through A, so the corporate map should show A above both companies rather than draw B as the parent of C or the reverse.

This example is useful when an agreement refers to affiliates. It tells you to look for the common controller and then return to the agreement to identify which of the sister companies is actually named and authorized for the relevant role.

A strategic investment with significant influence

Investor A holds a strategic investment in Company B and participates in B’s financial and operating policy decisions. If A does not control or jointly control those policies, IAS 28 describes B as A’s associate and A’s position as significant influence.

The relationship map should show an influence line from A to B rather than a control line. B is not A’s subsidiary on those facts, even though A has a meaningful role in decisions that affect B.

Keep the accounting term specific. “Associate” captures this significant-influence relationship under IAS 28; whether another document calls the companies affiliates depends on that document’s own definition.

A branch, division and subsidiary are not interchangeable

A subsidiary can be a separate legal entity from the existing company. In the government setup guidance used for this comparison, a branch is an office of the existing company and is not a separate legal entity. The distinction changes which entity you need to identify in a record or agreement.

“Division” describes an activity within a company in one IRS fact pattern. Check the formation and governing documents before assigning separate-entity status to a division elsewhere.

Use the formation, registration and governing documents to identify what you are dealing with. Do not assume that an operating label such as “division” creates a subsidiary, or that a branch has the same separate-entity status as a subsidiary.

Questions to ask before a contractor engagement crosses group entities

When contractor work involves more than one company in a group, document the role of each entity before relying on a broad label such as “affiliate.” The relevant agreement, authority and supporting records identify the operational relationship more precisely than the group chart alone.

The diagram orders the document check: named entity, control records, signing authority, work recipient and supporting records. The agreement and governing law determine each company’s role.

Which entity signs the agreement?

Start with the legal entity named as the contracting party and the name shown in the signature block. A parent, subsidiary or sister-company relationship does not itself establish which group company signed the agreement.

Then check the signatory’s authority to act for that named entity. Under the law of England and Wales or Northern Ireland, authority under section 43 can be express or implied; section 44 requires a person signing for more than one company to sign separately in each capacity.

In a cross-entity contractor engagement, a group label is too broad to operate from. Review the named contracting entity, signatory authority, work recipient and supporting records together; the agreement and governing law determine what another group company may do.

— Mike Smirnov

Record the contracting entity and the authority evidence with the agreement. If another group company needs a role, identify the document that gives it that role rather than inferring it from common control.

Which entity receives the work and holds the agreed rights?

The company that signs an agreement and the company that receives the work may need separate identification. Start with the agreement’s own wording: which entity is named as the recipient, and which clause identifies the party that receives the agreed rights?

Where more than one group entity is involved, keep the questions explicit:

• Does the agreement name the work recipient?
• Does it allocate the agreed rights to a named entity?
• Does it give another group company authority or a defined role?
• Do the signed documents and any applicable order or amendment match that allocation?

Do not fill a gap with the affiliate label. Whether a group company may receive work or hold agreed rights depends on the agreement, the authority chain and the governing law, so raise an unclear allocation for the appropriate expert review.

Which entity keeps the supporting documents?

Identify the entity responsible for maintaining the record of the engagement, then keep that answer aligned with the agreement and the group’s operating process. The record should let a reviewer connect the contractor work to the contracting entity, signatory authority, work recipient and agreed rights.

For a cross-entity arrangement, keep the supporting set together:

• the signed agreement and any order or amendment;
• the authority record for the signatory;
• the documents identifying the work recipient and agreed rights; and
• the records that explain each group entity’s role.

Related-party reporting can cover transfers of resources, services or obligations and can address transactions, balances and commitments when its conditions apply. The entity holding operational documents and the entity with reporting responsibilities may need separate review under the applicable requirements, so do not assume one group record answers every purpose.

When does another entity need express authority or its own agreement?

Treat this as a document question, not a group-structure shortcut. Another entity may need express authority or its own agreement when the intended role requires it under the agreement terms or governing law. The label “affiliate” does not resolve that question.

Review the role the other entity is meant to perform, then ask:

• Is it named as a party or given a role in the agreement?
• Does a document grant it authority to act, receive work or hold the agreed rights?
• Does the signatory have authority for that entity as well as the original contracting party?
• Does the applicable execution rule require a separate signature capacity?

Under the law of England and Wales or Northern Ireland, the section 44 execution rule requires separate signing in each capacity when one person signs for more than one company. Where the agreement or authority chain remains unclear, obtain an expert review before treating the additional entity as authorized or bound.

Frequently asked questions

These answers use the source-specific distinctions explained above. For a real reporting, tax or agreement question, apply the definition and governing document that control that particular decision.

Are all subsidiaries affiliates?

Under SEC Rule 405, yes: a subsidiary is an affiliate controlled directly or indirectly by the specified person. SEC Rule 405

That answer belongs to the rule’s securities-definition scope. Another document may define affiliate differently, so check the definition attached to the question you need to answer.

Is every affiliate a subsidiary?

No. In SEC Rule 405, an affiliate can be the parent that controls the specified company, the controlled subsidiary or another company under common control.

For example, two sister companies may be affiliates of each other through their shared parent. Neither is automatically the other’s subsidiary because neither needs to control the other. The wider affiliate label therefore includes relationships beyond the controlled-company relationship described by “subsidiary.”

Is a parent company an affiliate of its subsidiary?

Under SEC Rule 405, yes. The rule defines a parent as an affiliate that controls the specified person directly or indirectly.

The relationship works in both directions for the affiliate label: the parent is an affiliate because it controls the subsidiary, and the subsidiary is an affiliate because the parent controls it. “Parent” and “subsidiary” still identify the direction of control, so they remain the clearer terms when that direction matters.

What is the difference between an associate company and a subsidiary?

Under IAS 28, an associate is an entity over which an investor has significant influence. The investor can participate in financial and operating policy decisions without controlling or jointly controlling those policies.

A subsidiary is controlled by its parent. For IFRS reporting, control is the basis for consolidation, while IAS 28 generally applies the equity method to investments in associates, subject to its exceptions. The distinction turns on the relevant level of power, not on the casual use of the word “affiliate.”

Is an LLC considered a subsidiary?

An LLC’s legal form alone does not decide whether it is a subsidiary. The IRS describes an LLC as an entity created under state statute. Whether it is a subsidiary depends on who controls it under the applicable definition.

Tax classification is a separate issue. A single-member LLC may be disregarded as separate from its owner for one income-tax treatment and still be considered separate for other tax purposes. That treatment does not replace the control assessment used to decide a subsidiary relationship.

Does a percentage of ownership always decide the relationship?

No. A percentage can be part of a defined test, but it does not decide every affiliate, subsidiary, reporting or tax question. SEC Rule 405, for example, uses more than 50% of director-election voting securities for its separate “majority-owned subsidiary” definition, while its broader control definition also reaches contractual and other means of directing management and policies.

IAS 28 presumes significant influence at 20% or more of voting power, but that presumption belongs to its associate-accounting context. IFRS 10 requires an assessment of power, exposure or rights to variable returns, and the ability to use power to affect returns.

Use the percentage only after you identify the governing source. Then review the rights, ownership records and facts that the source requires for its particular conclusion.

Treat the label as the start of the analysis

“Subsidiary,” “affiliate,” “parent” and “associate” identify relationships. They do not settle every reporting, tax, liability or agreement question that follows.

Start by naming the decision you need to make and the source that governs it. Then map control, common control or significant influence; review ownership, voting and contractual rights; and identify the legal entity that bears the relevant obligation.

For a cross-entity contractor engagement, carry that discipline into the agreement. Confirm the named contracting entity, signatory authority, work recipient, agreed rights and supporting records. When those documents leave another group company’s role unclear, resolve that question under the governing terms and law before treating the role as established.