An Adoption Taxpayer Identification Number (ATIN) is A brief nine-digit number issued because of the IRS to people who are in the whole process of lawfully adopting a U.S. citizen or resident kid but who simply cannot get an SSN for that child in time to file their tax return. https://pmaccounting82693.evawiki.com/9399887/helping_the_others_realize_the_advantages_of_tax_free