This happened to me years ago, not exactly in your situation but my ex asking the Judge if he had to pay when he took his two children for holiday! The judge turned to him and said, "Is she not still holding a bedroom, a roof over their heads and food in their stomach. Now you didn't say how long he had to take his son for. This is the debating question. Yes you still have to do as I said however, if he has your son for lets say 6mths. Then "no" unfortunately, he would not have to pay support. The only real way you can find out is to take him back to court. Yes, you did the right thing in having your son go with his father, yet I would say the Judge would likely say again, as I wrote. If he is supporting you as well, then yes the payments should still be coming through. Something tells me though that your ex checked everything out, meaning he crossed his "t's" and dotted his "i's" or he likely would not have taken him. I wish you much luck however like I said it really depends on the length of time he actually has had to take him for.