Urban Institute and Brookings Institution Tax Policy Center. December 2018. Elaine Maag, senior research associate at the Tax Policy Center, explored how restricting Child Tax Credit (CTC) refundability as part of the 2017 Tax Cuts and Jobs Act actually reduced the value of another tax credit, the Child and Dependent Care Tax Credit (CDCTC), for many lower-income families.
https://www.taxpolicycenter.org/taxvox/how-tax-cuts-and-jobs-act-reduced-value-child-care-credit