Form SS-4, Application for Employer Identification Number (EIN)
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Form SS-4, Application for Employer Identification Number (EIN), is the IRS form a business or other entity files to request a nine-digit federal EIN used for tax filing, hiring employees, and opening business bank accounts. It's completed by the entity's owner or responsible party — a sole proprietor, LLC, corporation, partnership, estate, or trust. JustFill lets you fill Form SS-4 online free, auto-detecting every line so you can type or dictate your answers.
Form SS-4 is the IRS Application for Employer Identification Number (EIN), the document used to request the nine-digit number (formatted like 12-3456789) that the IRS assigns to businesses and other entities for tax filing and reporting. Sole proprietors, LLCs, corporations, partnerships, estates, trusts, churches, nonprofits, and certain individuals file Form SS-4 to obtain an EIN they'll need to hire employees, open a business bank account, file employment or excise taxes, or set up a retirement plan. You can fill Form SS-4 online free with JustFill: the AI reads the EIN application, detects each line and checkbox, and lets you type or dictate your entity name, responsible party, type of entity, and reason for applying — then download a clean, completed PDF.
Download the latest Form SS-4 (Rev. December 2025) and its line-by-line instructions free as fillable PDFs from the IRS at irs.gov/forms-pubs/about-form-ss-4. JustFill opens that same PDF in your browser so you can complete and print it without Adobe Acrobat.
Get the official Form SS-4 PDF from Internal Revenue Service (IRS)What each section of Form SS-4 asks for. JustFill’s AI will detect these fields automatically when you upload the PDF — review the breakdown below so you know what to enter.
The exact legal name of the business, estate, trust, or individual for whom the EIN is being requested.
Line 2 is a doing-business-as (DBA) name if different from line 1; line 3 names the executor, administrator, trustee, or 'care of' contact for estates and trusts.
Line 4a–4b is the mailing address (a P.O. box is allowed); line 5a–5b is the physical street address if different (no P.O. box permitted here).
The individual who ultimately owns or controls the entity, plus that person's SSN, ITIN, or EIN. Nominees are not allowed as the responsible party.
Whether the application is for an LLC (or foreign equivalent), the number of LLC members (8b), and whether the LLC was organized in the United States (8c).
Identifies the entity type: sole proprietor, partnership, corporation, S corporation/personal service corporation, estate, trust, church, nonprofit, government, and others.
Why you need the EIN: started a new business, hired employees, banking purpose, changed type of organization, purchased a going business, created a trust, or created a pension plan.
Date business started (11), accounting year closing month (12), highest number of employees expected (13), Form 944 election (14), first wages paid (15), principal business activity (16), line of merchandise/services (17), and whether the entity previously received an EIN (18). The Third Party Designee and signature sections close the form.
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Form W-9: Request for Taxpayer Identification Number and Certification
Form 2848: Power of Attorney and Declaration of Representative
Form SS-5: Application for a Social Security Card
Schedule C (Form 1040), Profit or Loss From Business (Sole Proprietorship)
Official source: Form SS-4 on Internal Revenue Service (IRS)’s website
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