Learn more about U.S. taxpayer information and reporting by Humanitix. Humanitix's Taxpayer Identification Number (TIN)? Why are you requesting my taxpayer information? (U.S. citizens) Why are you requesting my taxpayer information (non-U.S. citizens)Related ArticlesAbout US State Sales TaxWhy are you requesting my taxpayer information? (U.S. citizens)Why are you requesting my taxpayer information (non-U.S. citizens)Humanitix's Taxpayer Identification Number (TIN)US Taxes: 1099's