How is retroactive child support calculated?

The calculation of the retroactive award is not necessarily an end to this particular inquiry. There is no issue, as noted above, that there should be a retroactive award of child support; the respondent, in the face of a claim made by the wife failed to make adequate support payments or arrangements; as noted above the amount paid by the respondent was woefully inadequate considering his income as compared to that of the applicant. I have limited jurisdiction in exercising discretion beyond a pure set off child support amount when no evidence has been led regarding actual expenses paid by the respective parties for the children: see Contino v. Leonelli-Contino, supra.