Form detail
IRS Form SS-4
Application for Employer Identification Number (EIN)
Country
United States
Revision year
2025
Methods
paper, fax, efile
Updated
2026-05-01
Application for Employer Identification Number (EIN)
Used to apply for an employer identification number for a business, trust, estate, or other entity.
Who must file: Entities and persons that need an EIN for federal tax filing and reporting purposes, including many newly formed businesses and certain foreign-owned entities.
Practical overview
Form SS-4 is not an annual compliance form. It is the setup form that gives the entity the EIN needed for banking, payroll, and many federal and state filing workflows.
Practical steps
- Decide which legal entity or responsible party needs the EIN.
- Complete the SS-4 with the correct formation and classification details.
- Apply electronically when eligible, or use the IRS paper or fax path if required.
- Keep the EIN notice for later federal and state registrations.
Due-date notes
Submit before the EIN is needed for banking, payroll, or federal filing requirements.
Timing: as-needed
Penalty snapshot
No standard monetary penalty is listed in this seed record.
Related guides
Primary sources
- About Form SS-4Verified 2026-05-01
- Instructions for Form SS-4 (12/2025)Verified 2026-05-01
Important disclaimer
This library is for general tax education only. Always verify filing obligations, due dates, and tax consequences against the cited primary source or with a qualified tax professional.