If you are only claiming 2 kids and you are NOT the custodial parent, then you will leave the other 2 off your return. The non custodial parent can only claim the Child Tax Credit.
If you ARE the custodial parent, then you can enter all 4 on your return and then for the 2 you are not claiming, mark that the other parent will claim them this year. The custodial parent can still claim the EITC and Child and Dependent Care Credit.
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