For 2017, the maximum adoption credit and exclusion is $13,570 per child. The amount changes each year to adjust for inflation. The credit will begin to phase out for families with modified adjusted gross incomes above $203,540 and the credit will go away completely for those with incomes around $243,540.
Since the credit is per child, the maximum you claim depends on the number of children you adopt. If you adopt two children in 2017, your maximum is $13,570 x 2 or $27,140. If you adopt four children, the maximum is $13,570 x 4 or $54,280.
Adoption Tax Credit Amounts
2017: $13,570 non-refundable
2016: $13,460 non-refundable
2015: $13,400 non-refundable
2014: $13,190 non-refundable
2013: $12,970 non-refundable
2012: $12,650 non-refundable
*The credit was only refundable in 2010 and 2011. A refundable credit is one that a person can receive regardless of their tax liability. It is viewed as a payment so the parents can receive a refund larger than any taxes they have paid in during the year.
Adoption Tax Credit Income Phase-out Ranges
2017: $203,540 – $243,540
2016: $201,920 – $241,920
2015: $201,010 – $241,010
2014: $197,880 – $237,880
2013: $194,580 – $234,580
2012: $189,710 – $229,710
Source: http://fundyouradoption.tv/adoption-tax-credit/