What is a TIN and what is it for?
If you live in the United States or own a business that generates income there, understanding what a TIN is is incredibly important. TIN stands for Tax Identification Number, and having one is essential for filing your taxes. In fact, you cannot file taxes in the United States without a TIN.
Are there different types of TINs?
Yes. Tax Identification Numbers come in several forms, depending on who holds the number:
- SSN (Social Security Number): This is the number that U.S. citizens and residents use to file their personal taxes. To do this, they typically file Form 1040.
- ITIN (Individual Taxpayer Identification Number): This number is for people who need to file taxes but don’t have—and cannot get—an SSN. For example, a foreign national living and working in the U.S. who doesn’t qualify for an SSN yet, or a non-resident foreigner who earns income in the U.S. and needs to file taxes on it. People filing with an ITIN use Form 1040 if they live in the U.S., or Form 1040NR if they live abroad. While there are other reasons to get an ITIN, filing taxes is by far the most common.
- EIN (Employer Identification Number): This is the number businesses use to file taxes with the IRS (Internal Revenue Service). An LLC, for example, needs an EIN for many purposes, including tax filing—regardless of who owns it. This means even if you are a non-resident foreigner, you will need an EIN for your business. While a single-member LLC doesn’t file a separate corporate tax return (the income flows directly to the owner’s personal Form 1040 or 1040NR), a multi-member LLC must file Form 1065, and each partner will still file their own individual tax return separately.
This is why our name is Tin4Tax!
We are a team of professionals specializing in helping our clients safely and easily obtain either their EIN or their ITIN.
Are there any other kinds of TINs?
Yes. There is also the Adoption Tax Identification Number (ATIN) and the Preparer Tax Identification Number (PTIN). The ATIN is a temporary number for people in the process of adopting a U.S. child, and the PTIN is for tax professionals—like us at Tin4Tax—who help others prepare and file their tax returns.
Have more questions?
We are here to help! Feel free to contact us anytime—we would be glad to assist you. Write to us today at contact@tin4tax.com.

