Includes credits such as the low-income housing credit, child adoption credit, and "empowerment zone employment" (EZE) credit (not shown separately). Includes the portion of refundable credits used to offset income tax before credits.
For additional information about the return filing requirements, see the annual reports, Statistics of Income-Individual Income Tax Returns at https://www.irs.gov/uac/soi-tax-stats-historical-data-tables.
U.S. Department of the Treasury. Internal Revenue Service, Individual Income Tax Filing: Tax Credits [TXCDTNR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/TXCDTNR, April 24, 2018.