The federal credit is nonrefundable. In the case of CA at least it appears you could have enough tax to get the full credit while still being under the income c

The federal credit is nonrefundable. In the case of CA at least it appears you could have enough tax to get the full credit while still being under the income cap. In other states such as PA it's likely not possible to have enough tax to get the full federal credit while also qualifying for the state credit.