Your tax ID is your own Social Security number--or if you do not have a Social Security number it could be your ITIN. There are some people who get a Tax Identification number to use instead of having to give out a Social Security number when they are going to get a 1099Misc for work as an independent contractor. Did you get a Tax ID from the IRS for a purpose such as that?
https://www.irs.gov/individuals/international-taxpayers/taxpayer-identification-numbers-tin
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
