An Adoption Taxpayer Identification Number (ATIN) is A brief nine-digit number issued with the IRS to people who are in the entire process of lawfully adopting a U.S. citizen or resident boy or girl but who can't get an SSN for that child in time to file their tax return. https://ricardob577u.blogolenta.com/30434433/the-fact-about-taxdome-login-that-no-one-is-suggesting