SS-4 Lines 1–3: Separate Legal Name, Trade Name, and Care-of Fields

The practical answer

A brand name, a formation record, and a correspondence contact can point to three different names. Copying the most familiar name into every SS-4 field makes the application harder to reconcile with the documents behind it. Three details shape the review: Which document supports the legal entity name? Is the trade name actually different? Whose role does the contact name describe? Keep each answer tied to the document or confirmed fact that supports it.^{[1, p.2] [2, p.1] [1, p.3]}

Scope and the records behind the answer

The discussion follows the entity, form and transaction conditions identified below. The same label on a different form can have a different purpose. Keep the relevant entity and reporting period visible while you compare the requirements, and treat each stated exception as part of the rule rather than an optional footnote.

Official sources checked: 2026-11-09. Annual tax-year forms and continuously revised forms are identified separately in the references.

A side-by-side preparation table

Work through the official requirements

Legal name

Line 1 requires the applicant's legal name, consistent with the applicable Social Security card, formation document or other legal document.^{[1, p.2]}

Field/section 1: Legal name of entity (or individual) for whom the EIN is being requested

Enter the applicant's legal name consistently with its applicable formation or other legal documents.^{[2, p.1] [1, p.2]}

Field/section 2: Trade name of business (if different from name on line 1)

Complete this line only if the trade name or DBA differs from the legal name on line 1.^{[2, p.1] [1, p.3]}

Field/section 3: Executor, administrator, trustee, “care of” name

As applicable, enter the trustee, executor or care-of contact who receives tax information.^{[2, p.1] [1, p.3]}

Mailing address

Lines 4a-4b identify the mailing address where the entity receives correspondence. A foreign address must include the city, province or state, postal code and full country name.^{[1, p.3]}

Authorized signer

The authorized SS-4 signer depends on the type of applicant. A foreign applicant may use a person with appropriate authorization to sign.^{[1, p.6]}

Designee scope

The third-party designee may answer questions about the completed SS-4 and receive the new EIN. Signed authorization is required, and that authority ends when the EIN is assigned and released to the designee.^{[1, p.6]}

Not entity election

Checking an entity-type box on SS-4 is not itself an entity-classification tax election.^{[1, p.4]}

Physical address

Complete lines 5a-5b only when the entity's physical address differs from its mailing address. Do not enter a P.O. box here.^{[1, p.3]}

An illustrative preparation scenario

In this hypothetical preparation example, an owner hands a preparer a formation certificate, a website screenshot, and an email from an accountant. Each shows a different name. The review starts by identifying what each document actually describes before putting names on the draft. The preparer checks three points: Which document supports the legal entity name? Is the trade name actually different? Whose role does the contact name describe? The file remains a working comparison until the relevant facts and applicable instructions have been checked together. No agency outcome is assumed.^{[1, p.2] [2, p.1] [1, p.3]}

This is a planning illustration, not a statement that a particular filing has been accepted or that an entity qualifies for a tax result. Use the source-backed distinctions above to decide what information still needs to be established before a form is completed.

A review sequence you can actually use

1. Which document supports the legal entity name?
2. Is the trade name actually different?
3. Whose role does the contact name describe?

Write down the answer and the record that supports it, rather than marking a question complete because a field contains text. When two records disagree, identify whether the difference concerns the entity, an individual, the reporting period or the type of change. That makes the remaining question specific enough to resolve against the relevant instruction.

Keep the scope of a preparation service separate from the government requirement. A service intake question may gather information for a workflow; it does not create an exception, extend a deadline or determine whether a transaction is reportable. The cited government material remains the basis for those conclusions.

Questions to settle before moving forward

How should I check field/section 2: trade name of business (if different from name on line 1)?

Complete this line only if the trade name or DBA differs from the legal name on line 1. ^{[2, p.1] [1, p.3]}

How should I check field/section 3: executor, administrator, trustee, “care of” name?

As applicable, enter the trustee, executor or care-of contact who receives tax information. ^{[2, p.1] [1, p.3]}

How should I check mailing address?

Lines 4a-4b identify the mailing address where the entity receives correspondence. A foreign address must include the city, province or state, postal code and full country name. ^{[1, p.3]}

How should I check authorized signer?

The authorized SS-4 signer depends on the type of applicant. A foreign applicant may use a person with appropriate authorization to sign. ^{[1, p.6]}

Official sources and versions

1. Instructions for Form SS-4 (Rev. December 2025) — Rev. December 2025
2. Form SS-4 (Rev. December 2025) — Rev. December 2025

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