What do you mean by "underage?" If one of the children turned 17 before the end of 2020 you do not get the child tax credit for that child. You lose the CTC in the year that the child turns 17---which often comes as a surprise to parents.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
