If support has not been finalized, the Magistrate can't put him in jail (yet). You'll need to finalize the case first, then if he doesn't pay on the final order, the consequences are the same for an "illegal" immigrant as they are for anyone else - ultimately if he refuses to pay and there is no other method to enforce the order, he will be incarcerated. -- David Bliven, Bronx Child Support lawyer (www.blivenlaw.net)