What is the definition for back child support?

Answer 1

Child that has been ordered, retroactively, back to the breakup of the parents, or the birth of the child, up to the statutory limits of the state, and determinant on whether this involves a divorce or paternity case.

In a divorce, it is retroactive back to the breakup of the parents. This is the same in cases where the parents were simply cohabiting. However, in cases where the parents had never been a couple, the retroactive amount can be up to 21 years worth, depending on the state. Further, depending on the state, the claim can be filed up until the child turns age 23. Knowledge of the existence of the child by the paternal parent is not a mandatory requirement under the laws of the states that allow this, but could be a consideration by the courts.