How to complete and file out Form SS-4: A step-by-step guide for 2026

Getting an Employer Identification Number (EIN) is one of the first practical steps many new businesses take. You may need it to hire employees, open a business bank account, file certain tax returns, or establish the entity’s federal tax account. Form SS-4 is the IRS application used to request that number.

Although the form is short, the choices you make can determine which federal returns and notices the IRS associates with your entity. Start only after your entity’s legal name, formation details, and responsible party are settled—and use the information consistently across your records.

What is Form SS-4?

Form SS-4, Application for Employer Identification Number, is used to apply for an EIN. An EIN is a nine-digit federal tax identification number assigned to sole proprietors, corporations, partnerships, estates, trusts, and other eligible entities for tax filing and reporting purposes. An EIN is for business activities; it does not replace an individual’s SSN or ITIN.

Who needs to file Form SS-4?

Use Form SS-4 when an eligible entity needs a new EIN. Common applicants include new employers, corporations, partnerships, LLCs, trusts, estates, and businesses that must file federal employment, excise, or certain income-tax returns. A sole proprietor generally needs only one EIN regardless of the number of trade names used.

Do not apply for a new EIN merely because the business name or address changed. The IRS instructions identify situations that require a new EIN and those that do not. Existing entities update address, location, or responsible-party information with Form 8822-B instead. An entity with an EIN generally must report a responsible-party change to the IRS within 60 days.

What to gather before you start

• Legal entity name, trade name, formation date, and state or country of formation
• Mailing and physical business addresses
• Responsible party’s legal name and SSN or ITIN, when required
• Entity type, member/owner details, and intended federal tax classification
• Reason for applying, accounting year-end month, expected employee counts, and principal activity

How to fill out Form SS-4

1. Enter the legal name and trade name

Line 1 is the legal name of the entity or individual requesting the EIN. Use line 2 only when the business operates under a different trade name. For an estate, trust, or other specialized entity, follow the line-specific instructions.

2. Add addresses and principal location

Lines 4a–4b are the mailing address. Lines 5a–5b are the physical street address if it differs; do not use a P.O. box for the physical-address line. Line 6 identifies the county and state of the principal business location.

3. Identify the responsible party

Lines 7a–7b require the responsible party’s name and taxpayer ID. Except for a government entity, the responsible party must be a natural person—not another entity—and is generally the person who ultimately owns, controls, or exercises effective control over the applicant. A nominee cannot apply for the EIN or be listed as the responsible party.

4. Select entity type and tax classification

Lines 8 through 9 ask about LLC status and entity type. This section affects which federal return the IRS expects. An LLC must identify its member count and intended treatment when required. Do not confuse an EIN application with a classification election: Form 8832 and Form 2553 have separate purposes.

5. Complete the business and employment questions

Lines 10 through 18 cover the reason for applying, start date, closing month of the accounting year, employee expectations, employment-tax filing, principal business activity, and prior EIN history. Answer from the entity’s actual plans and records. Generally, enter ‘N/A’ on lines that do not apply, and use the applicable selection or return type where the form requires one.

6. Sign or authorize a third-party designee

The responsible party or an authorized person signs the application. A third-party designee can be authorized to receive the EIN and answer questions about the application, but that authorization is limited and does not make the designee the responsible party.

How to apply for an EIN

The IRS recommends applying online when possible for applicants in the United States or U.S. territories; an EIN can be received free of charge through the IRS process. Form SS-4 can also be used for fax or mail applications, and international applicants have additional options. File only one application for the same entity and retain the EIN confirmation with permanent records.

Common Form SS-4 mistakes to avoid

• Applying before the entity is legally formed when formation is required
• Using a nominee instead of the responsible party
• Entering a trade name as the legal name
• Choosing an incorrect entity type or tax return
• Submitting duplicate applications for the same entity
• Using the EIN in place of a responsible party’s SSN or ITIN

Form SS-4 Generator by Jotform

Applying for an EIN requires consistent entity, ownership, and tax-account information. Jotform’s Form SS-4 Generator provides a structured, fillable workspace for collecting the details needed to prepare Form SS-4 and download a completed PDF for review.

Organize entity information in one place

Use the labeled fields to gather the legal name, trade name, formation details, mailing address, principal business location, responsible-party information, ownership details, and expected employment information. Keeping these records together can make it easier to compare the completed form with formation and tax documents.

Create a clearer review process

An EIN application may involve founders, accountants, payroll teams, and legal advisers. Before applying, use the completed form to verify that the legal name, responsible party, entity type, and intended tax return align with the entity’s official records and plans.

Keep sensitive information secure

Form SS-4 can include taxpayer identification numbers, addresses, and ownership details. Jotform protects submissions with 256-bit SSL encryption and GDPR- and CCPA-enabled features. You can also use Encrypted Forms for additional protection.

Download a completed copy for review

After completing the fields, download a PDF for internal review and recordkeeping. Jotform does not submit Form SS-4 to the IRS, assign an EIN, determine who is the responsible party, or make an entity-classification election. The applicant remains responsible for submitting accurate information through the appropriate IRS method.

Get ready to apply for an EIN

An EIN application is easier to manage when your entity details, responsible-party information, and tax plans are complete before you apply. Review the current IRS instructions, submit only one application for the entity, and keep the EIN assignment notice with your permanent business records.

Ready to organize your EIN application details? Use Jotform’s Form SS-4 Generator to prepare a fillable form and download a PDF for review before applying.

AS ALWAYS, CONSULT AN ATTORNEY AND/OR OTHER APPLICABLE PROFESSIONALS BEFORE RELYING ON ANY INFORMATION ON THIS PAGE. THE CONTENT ABOVE IS FOR INFORMATIONAL PURPOSES ONLY. JOTFORM IS NOT PROVIDING LEGAL, TAX, FINANCIAL OR OTHER ADVICE.