What Is the Difference Between an EIN, TIN, and ITIN?
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The acronyms EIN, TIN, and ITIN are used by the IRS to identify the different types of tax ID numbers. The main difference between an EIN and an ITIN or TIN is that an EIN is used for business entities while an ITIN is used for individuals. TIN is an umbrella term for the various kinds of taxpayer identification numbers.
Written by the Upsolve Team. Legally reviewed by Jonathan Petts
Updated January 30, 2025
Overview: EIN vs. TIN vs. ITIN
Taxpayer identification numbers are essential for tax compliance, but each type serves a unique purpose. Here’s a quick breakdown:
TIN (Taxpayer Identification Number): An umbrella term that includes all tax ID numbers issued by the IRS or SSA, such as SSNs, EINs, and ITINs.
EIN (Employer Identification Number): A tax ID for businesses, estates, and trusts, used for tax filings, payroll, and opening business accounts.
ITIN (Individual Taxpayer Identification Number): A tax ID for individuals who can't get an SSN, such as undocumented immigrants or foreign nationals, to file taxes and meet U.S. tax laws.
What Is a TIN?
A Taxpayer Identification Number (TIN) is used by the Internal Revenue Service (IRS) in U.S. tax law administration. Your TIN is issued either by the Social Security Administration (SSA) or by the IRS. A TIN is used on tax returns, tax statements, and other tax-related documents.
There are a few types of TIN numbers that all serve different purposes. Below, we’ll talk about Employer Identification Numbers and Individual Taxpayer Identification Numbers in more detail.
What Is an Employer Identification Number (EIN)?
An EIN is a nine-digit number the IRS uses to identify business entities like corporations and LLCs for tax purposes. EIN’s are also known as federal tax identification numbers which are used on Form 1041: U.S. Income Tax Return for Estates and Trusts to report income from estates and trusts. You often need an EIN to open a business bank account.
The main thing that separates an EIN from a TIN is that an EIN is for a business while a TIN is for an individual.
How Do I Get an EIN?
There are four different ways you can receive an employer identification number/federal tax ID number.
Option 1. Apply for an EIN Online
The quickest way to get an EIN is by applying online through the IRS website. This also allows you to pay with a credit card. If your business, office, or agency is located in the United States can use the EIN online application. When you apply for an EIN online, you will receive your ID number immediately.
Option 2. Apply for an EIN by Mail
You can also download and complete Form SS-4 to send it by mail. If your business needs a new employer ID number, one will be assigned and mailed to you. When you apply for an EIN by mail, you will receive your ID number in four weeks.
Option 3. Apply for an EIN by Phone
Applying by phone is a great option for non-resident alien applicants. If you are an international EIN applicant, you can call 1-267-941-1099 to obtain your EIN number. If you’re the one making the phone call, you need to be authorized to receive the EIN for your business entity.
The person applying by phone also needs to be able to answer any questions concerning the SS-4 form. Typically, it is the business owner who would make this phone call.
Option 4. Apply for an EIN by Fax
Finally, you can fax your completed Form SS-4 application to the IRS.
What Is an Individual Taxpayer Identification Number (ITIN)?
An ITIN is a nine-digit tax processing number that the IRS uses to identify individuals for personal tax purposes. ITINs are only assigned to individuals who are required to have taxpayer identification but are ineligible to get a Social Security Number (SSN).
How Do I Get an ITIN?
If you need an ITIN, you will need to complete IRS Form W-7: IRS Application for Individual Taxpayer Identification Number. This form requires documentation of foreign/immigrant status and identification documentation and can be brought to an IRS walk-in office or to an authorized Acceptance Agent.
Important: You cannot claim earned income credit using an ITIN.
Other Tax Identification Numbers
Social Security numbers, Adoption Taxpayer Identification Numbers and Preparer Tax Identification numbers are also sometimes used a tax ID numbers. Read on to learn more about each of these.
Social Security Number (SSN)
A Social Security number (SSN) is an individual identification number. Social security cards are issued by the Social Security Administration (SSA). Social Security numbers are nine-digit ID numbers in the format: xxx-xx-xxxx.
To apply for a Social Security number you must fill out and file Form SS-5: Application for a Social Security Card. Your local social security office may be able to help you with this process.
Adoption Taxpayer Identification Number (ATIN)
An Adoption Taxpayer Identification Number (ATIN) is issued by the IRS to individuals who are in the process of legally adopting a child who is a U.S. citizen or U.S. resident. An ATIN is a temporary nine-digit number that adopters use for adding dependents when filing taxes.
You can apply for an ATIN by filing Form W-7A: Application for Taxpayer Identification Number for Pending U.S. Adoptions.
Preparer Tax Identification Number (PTIN)
A PTIN is used by individuals who are paid tax preparers. If you are someone who prepares tax forms, you will need to add your PTIN to all of the tax returns you prepare. If you need a new PTIN, you can apply for one through the IRS sign-up system.
