Yes. A federal ID number and an EIN are the same thing in ordinary business usage: both refer to the nine-digit Employer Identification Number the IRS assigns to businesses, estates, trusts, and other entities for tax filing and reporting.1Internal Revenue Service. About Form SS-4, Application for Employer Identification Number (EIN) You will also see it called a Federal Tax Identification Number, or FTIN. Three labels, one number, formatted as XX-XXXXXXX.
Why One Number Has Three Names
“Federal ID Number” and “Federal Tax ID Number” are informal, plain-English labels people reach for when they don’t want to say “Employer Identification Number.” The IRS’s official name is EIN, which is itself a little misleading, because you need one even if you never hire an employee. The name was coined decades ago when the number was mainly used for payroll tax reporting, and it stuck as the number’s role expanded to cover corporate income tax, partnership returns, excise taxes, estates, trusts, and nonprofit reporting.
So when a bank asks for your federal tax ID, a vendor asks for your federal ID number, and the IRS asks for your EIN, they all want the same nine digits. Give the EIN in any of these situations and you have answered the question correctly.
When “Federal ID Number” Might Mean Something Else
The phrase “federal ID number” is loose enough that it can occasionally refer to a different IRS-issued taxpayer identification number. These are not interchangeable with an EIN, and using the wrong one on a return or application can cause a rejection.2Internal Revenue Service. Taxpayer Identification Numbers (TIN)
The Social Security Number is the default federal identifier for individuals. A sole proprietor with no employees and no excise tax obligations can use an SSN in place of an EIN for business reporting.
The Individual Taxpayer Identification Number, or ITIN, is a nine-digit number beginning with 9 that the IRS issues to people who must file a U.S. federal return but are not eligible for an SSN.3Internal Revenue Service. Individual Taxpayer Identification Number (ITIN) It does not authorize work, does not qualify the holder for Social Security benefits, and cannot substitute for an EIN when an entity-level number is required.
The Preparer Tax Identification Number, or PTIN, is required for anyone who prepares federal returns for compensation, and it must be renewed annually.4Internal Revenue Service. IRS Reminds Tax Pros to Renew PTINs for the 2026 Tax Season The Adoption Taxpayer Identification Number, or ATIN, is a temporary number for a child in a pending domestic adoption when the adopting parents can’t yet get the child’s SSN.5Internal Revenue Service. Adoption Taxpayer Identification Number Neither has anything to do with business tax compliance.
The practical rule: if you’re being asked for a number in a business context — opening a bank account, filing a business return, applying for a license, completing a W-9 as a company — the “federal ID number” almost always means the EIN.
Who Actually Needs an EIN
Every corporation and partnership needs an EIN, regardless of size or revenue.6Internal Revenue Service. Get an Employer Identification Number Multi-member LLCs fall into the same category. Sole proprietors need one once they hire employees or begin filing excise tax returns. Estates, trusts, and nonprofit organizations each need their own EIN. Retirement plan administrators do as well.
A single-member LLC with no employees and no excise tax obligations can technically use the owner’s SSN.7Internal Revenue Service. When to Get a New EIN In practice, most banks require an EIN to open a business account, and using one keeps the owner’s SSN off invoices, vendor forms, and W-9s. Because the application is free and fast, most single-member LLCs get one anyway.
A sole proprietor with no employees who reports income and expenses on Schedule C can use an SSN and skip the EIN entirely. That changes the moment you hire someone, take on a partner, incorporate, or start filing excise tax returns.
How to Get an EIN
You apply by submitting IRS Form SS-4. The fastest way is the IRS’s online tool, which assigns your number immediately once the application is accepted.8Internal Revenue Service. Instructions for Form SS-4 (Rev. December 2025) The online system is available Monday through Friday from 6:00 a.m. to 1:00 a.m. Eastern, Saturdays from 6:00 a.m. to 9:00 p.m., and Sundays from 6:00 p.m. to midnight.6Internal Revenue Service. Get an Employer Identification Number You can also fax Form SS-4 and receive your number in about four business days, or mail it and wait roughly four weeks.
The application is free. If a website charges you, you’re not on irs.gov. Third-party services that advertise EIN “filing” are simply completing the same free form on your behalf. Some of these sites are designed to look official, so check the URL before entering any information.
If you’re forming an LLC, corporation, partnership, or tax-exempt organization, complete your state-level formation first. The IRS warns that applying before the state filing is done can delay processing. You’ll need the entity’s exact legal name as registered with the state.
Every application also requires a responsible party: the individual who owns or controls the entity, identified by full legal name, title, and personal taxpayer identification number (usually an SSN). The responsible party must be a person, not another business, with the sole exception of government entities.9Internal Revenue Service. Responsible Parties and Nominees
If You Already Have an EIN but Can’t Find It
An EIN never expires, and the IRS won’t issue a second one to the same entity. So if you’re asking whether a federal ID number is the same as an EIN because someone is asking for a number you can’t locate, start with what you already have. Check old business tax returns. Look for the original IRS assignment notice (Form CP 575). Check bank account paperwork or state license applications, both of which typically required the EIN.
If none of that turns it up, call the IRS Business and Specialty Tax line at 1-800-829-4933, Monday through Friday, 7:00 a.m. to 7:00 p.m. local time. After identity verification, the IRS will send a 147C verification letter confirming the number by mail or fax.
One last point worth knowing: even after a business closes, its EIN stays permanently tied to that entity.10Internal Revenue Service. Closing a Business The IRS does not reuse or reassign it. So if you’re looking at a number from an old business, that’s still its number, and no one else has it.