Except as provided in subd. 2., if a parent who is required to pay child support under par. (b) or (c) is receiving adoption assistance under s. 48.975 for the child for whom support is ordered, the amount of the child support payments determined under par. (b) or (c) may not exceed the amount of the adoption assistance maintenance payments under s. 48.975 (3) (a). If an agreement under s. 48.975 (4) is in effect that provides for a payment of $0 under s. 48.975 (3) (a), the payment of $0 shall be considered to be an adoption assistance maintenance payment for purposes of this subdivision.

Subdivision 1. does not apply if, after considering the factors under par. (c) 1. to 11., the court finds by the greater weight of the credible evidence that limiting the amount of the child support payments to the amount of the adoption assistance maintenance payments under s. 48.975 (3) (a) is unfair to the child or to either of the parents.