Sure, here’s the definition of “TIN taxpayer identification number”:

A Taxpayer Identification Number (TIN) is a unique nine-digit number issued by the Internal Revenue Service (IRS) to individuals and businesses. It is used to identify taxpayers and track their tax liabilities and payments. The TIN is often also used for other purposes, such as applying for tax benefits, filing tax returns, and receiving tax refunds.

Here are the different types of TINs:

• Individual Taxpayer Identification Number (ITIN): An ITIN is a tax processing number issued to individuals who are not eligible for a Social Security Number (SSN).
• Employer Identification Number (EIN): An EIN is a tax processing number issued to businesses, trusts, partnerships, and other entities.
• Social Security Number (SSN): An SSN is a unique nine-digit number issued by the Social Security Administration to U.S. citizens and permanent residents.

It is important to note that you should not share your TIN with anyone unless you are certain that they are a legitimate government agency or business.