This is a temporary number issued by the IRS for an adoptive child. It is provided to individuals legally adopting a U.S. citizen or resident child who is not eligible to obtain an SSN for that child in time to file their tax return.
IRS website for ATIN: https://www.irs.gov/individuals/adoption-taxpayer-identification-number
This information applies to all years of UltimateTax software.
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