Taxes and child support? Update

My daughter is 5 an her dad only paid child support twice. He owes about 2000-3000. He hasn't paid since 2017. If he doesn't say he pays child support on his taxes or anything, would they take it out of his taxes?

It is court ordered & has been going on for 3 years. He called n told them I don't want child support BEHIND MY BACK in 2017. But the amount still keeps going up? They don't take it from his paycheck automatically or nothing so I'm not sure what's going on with it?