If all of you live together as a family, the child can only be entered on ONE of your tax returns--not on both. The "sharing" of child-related credits you may have heard about is only between divorced or never married parents who live apart and share custody. Prepare your tax returns both ways --with Mom or Dad claiming the child--- to see which way it comes out better. If the higher earner claims the child they can also file as Head of Household.