An Employer Identification Number (EIN) is a federal tax identification number issued by the U.S. Internal Revenue Service (IRS) to identify a business or other entity for tax administration. It is often compared to a business tax ID, but it is not the same as a state registration number, sales-tax permit, or personal Social Security number.
What is an EIN used for?
Depending on the business, an EIN may be used for federal tax returns, payroll, certain excise-tax filings, and banking or financial onboarding. Banks commonly request the EIN or other tax information as part of their own identity and compliance checks. An EIN alone does not prove that a business is licensed, in good standing, or eligible for a particular bank account.
Who may need one?
Many corporations and partnerships need an EIN. Employers generally need one, and some other entities or tax situations also require it. A sole proprietor without employees may not always need an EIN for federal tax purposes, but may choose or be required to obtain one in particular circumstances. Always check current IRS guidance for your entity type.
Applying carefully
Eligible applicants can apply through the IRS’s official EIN process. The responsible party and entity details must be accurate, and the application should not be submitted repeatedly just because a confirmation is delayed. International applicants may have different application methods than applicants with a U.S. principal business location.
Common mistakes
- Using a business name that does not match the formation or tax records.
- Confusing a state filing number with an EIN.
- Assuming an EIN guarantees approval for a bank account, payment processor, or credit product.
- Paying a third party without understanding that the IRS provides an official application route.
- Sharing tax documents or EIN confirmation letters with unverified contacts.
Protect the number
An EIN is not a password, but it is still sensitive business information. Keep the confirmation notice with company records and share it only when there is a legitimate business need. Monitor unexpected tax correspondence and verify requests through independently obtained contact details.
For current requirements and application methods, consult the IRS directly. This guide is general information, not tax or legal advice.