First of all, he has to pay taxes. Second, if they have his social number it will show up. You need to get a court order, and set a hearing date, the judge can than make him bring in his earnings. He has to keep books if he has his own business. And he had to apply for a business license. So theres no way he can hide. And then they will put a flag on his income tax returns, and any money he has coming, will go straight to you.Go down to your county and file for child support and give them all the info you have.