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Reviewed by: William McLee
Reviewed date:
February 16, 2026

What Form SS-4 Is For

Form SS-4 is the IRS form used to request an Employer Identification Number (EIN) for business entities operating in the United States. The Internal Revenue Service requires an EIN when organizations file a tax return, annual information return, or engage in activities involving limited liability companies, foreign corporations, or foreign-owned U.S. companies. Applicants also use it when completing related IRS forms such as Form W-9 or Form 1041.

When You’d Use Form SS-4

You use Form SS-4 when your business entity needs an Employer Identification Number for tax filing or banking requirements during any tax year. You also use it when foreign owners must file IRS Form 5472 under Section 6038A, including for a fiscal year-end. Applicants in Washington, DC, U.S. possessions, Arizona LLC structures, or other locations also rely on an EIN for ongoing compliance.

Key Rules or Details for 2016

  • Responsible party identification: You must enter a responsible party with a valid Social Security number because the Internal Revenue Service requires accurate identification. This ensures reliable recordkeeping when reporting a line of business or related information.

  • Foreign ownership rule: You must provide foreign ownership details when filing under section 6038A because transactions involving foreign corporations require added reporting. This supports IRS oversight and ensures the accurate submission of annual information returns.

  • Daily EIN issuance limit: You receive one EIN per responsible party each day because the IRS enforces limits to reduce duplication. This prevents confusion and maintains consistency during the application process.

  • U.S. address requirement: You provide a U.S. mailing address even when operating from U.S. possessions because the IRS processes EIN requests using domestic routing. This ensures delivery of documents and follow-up notices.

  • Multiple submission options: You may use the application by mail, fax, or telephone, as the IRS supports several submission paths. These options help business entities access EIN processing without geographic limitations.

Step-by-Step (High Level)

Step 1: Determine the line eligibility

You can confirm that your business entity requires an Employer Identification Number and review whether your structure involves foreign owners or limited liability companies. You also check whether the filing requirements of section 6038A apply to your activities during the tax year.

Step 2: Gather required information

You collect your legal name, mailing address, Social Security number, line of business description, and fiscal year-end. You also gather information involving foreign corporations or foreign-owned U.S. companies when preparing documentation for IRS Form 5472.

Step 3: Choose your application method

You can select an application by fax, mail, or telephone, depending on your needs. You review all entries carefully before you continue to the next screen when following online instructions.

Step 4: Complete Form SS-4 accurately

You enter all required information, including business structure and responsible party details, and verify that each field matches IRS requirements. You confirm accuracy to ensure the Internal Revenue Service assigns your Employer Identification Number without delays.

Step 5: Submit and retain confirmation

You can submit the completed form to Cincinnati, OH, or through your selected method, and then wait for the EIN assignment to be processed. You keep the confirmation notice because you use the Employer Identification Number for tax return filings or annual information return submissions.

Common Mistakes and How to Avoid Them

  • Incorrect responsible party: Some applicants list a business name instead of an individual, which delays processing. You can avoid this issue by providing an individual’s Social Security number exactly as the form requires.

  • Missing foreign ownership details: Filers sometimes overlook foreign owners when section 6038A applies, which creates reporting problems. You can prevent this problem by reviewing the IRS Form 5472 instructions before completing the application.

  • Outdated mailing address: Applicants sometimes enter an incorrect address, resulting in missing notices. You can avoid this situation by checking your current mailing address immediately before submitting your form.

  • Vague line of business: Some applicants provide unclear activity descriptions, which can impact tax classification. You can prevent this error by describing your line of business with clear, specific wording.

  • Incomplete signature section: Applicants sometimes skip the signature area, which stops processing. You can avoid this complication by signing the form and confirming whether a third-party designee is included, as applicable.

What Happens After You File

After you submit your form, the Internal Revenue Service assigns your Employer Identification Number through your selected method. You will receive the EIN immediately by telephone or after it has been processed. You use your EIN for tax return filings, annual information return reports, or section 6038A documentation. You also store your EIN carefully, as it remains permanently associated with your business entity.

FAQs

Does every business entity need an EIN?

Not every business needs one, but most business entities require an Employer Identification Number (EIN) for banking, tax return filing, or compliance reporting purposes. Requirements apply to limited liability companies, foreign corporations, foreign-owned U.S. companies, and similar entities.

Can a foreign owner apply for an EIN?

Yes, a foreign owner may use an application by telephone when no Social Security number is available. The Internal Revenue Service issues an EIN after verifying identity and business details.

Does Form SS-4 relate to IRS Form 5472?

Yes, foreign-owned U.S. companies must obtain an EIN before filing IRS Form 5472 under section 6038A. The EIN identifies the business entity on every annual information return.

Can I apply without creating a user account?

Yes, it is possible to apply by fax, mail, or telephone without the need to establish a user account. Online instructions, including account creation and sign-in procedures, are exclusively applicable to IRS website tools.

What if I lose my EIN confirmation?

You may contact the Internal Revenue Service to request verification. The EIN remains permanently assigned, and you can use it for all future filings once it is retrieved.

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