Can I get back child support?

Yes, you can collect back child support IF it was ordered by the court. They call this arrearages and can be collected. Interest may also be charged on these amounts.

If you do not have a court order for child support, then the answer is no. You cannot collect back child support when there is no court order. Child support is ordered going forward and cannot be ordered paid retroactively. In some cases the court may order the child support from when the motion was filed.