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Information about Form SS-4, Application for Employer Identification Number, including recent updates, related forms, and instructions on how to file. Form SS-4 is used by sole proprietors, corporations, partnerships, estates, trusts, and other entities to apply for an EIN.

Find information about getting an employer identification number (EIN), understanding deductions and tax credits and using the IRS tax calendar.

Search for business topics like employer tax identification number (EIN) information, with the A-Z Index. Search by business type or subject.

Find tax information and tools for businesses including Employer ID Number (EIN), Employment Tax, Estimated Tax and the Foreign Account Tax Compliance Act (FATCA).

IR-2023-15, January 26, 2023 — The Internal Revenue Service today urged employers to be aware of the January deadline to file Forms W-2 and other wage statements. Filing these documents timely prevents late-filing penalties for employers, helps employees file their income tax returns and prevents tax fraud.

There are some differences between a reporting agent authorized under Form 8655, Reporting Agent Authorization and an agent appointed using Form 2678, Employer/Payer Appointment of Agent.

Review information about the Limited Liability Company (LLC) structure and the entity classification rules related to filing as a single-member limited liability company.

FATCA Dictionary for Registration Form

Refineries with Terminal Racks

For tax years beginning after December 31, 2006, the Small Business and Work Opportunity Tax Act of 2007 (Public Law 110-28) provides that a "qualified joint venture", whose only members are a married couple filing a joint return, can elect not to be treated as a partnership for Federal tax purposes.