A: After calculating a family’s total family income from all sources, the VTP factors expenses from housing, medical, daycare, tithing and Catholic HS tuition to calculate a Modified Tuition Income (MTI) for each family. Recommended tuition is then based on 6-8 percent of the MTI based on where the MTI falls on a sliding scale. School administrators have the ability to adjust this recommended tuition based on factors not included in the formula (i.e. recent job loss, external income sources, family illness).