Vt. Stat. Ann. tit. 15, § 655

In any proceeding to establish or modify child support, the total support obligation shall be presumed to be the amount of child support needed, from which a parental support obligation shall be calculated and ordered to be paid unless support is established under section 659 of this title. The court shall review the adequacy of a child support amount agreed to by the parties with reference to the total support obligation.