Missouri Child Support Calculator

Missouri calculates child support using the Income Shares Model through the Form 14 worksheet required by Supreme Court Rule 88.01. Both parents' gross monthly incomes are combined, matched to the Child Support Schedule based on the number of children, and divided proportionally by each parent's income share. The Form 14 amount is presumed correct under RSMo § 452.340, though courts may deviate when the result would be unjust.

Missouri Form 14 includes all gross income sources: wages, salaries, bonuses, commissions, self-employment earnings, investment income, rental income, and government benefits. Courts may impute income to a parent who is voluntarily underemployed or unemployed without good cause. Both parents must disclose all income sources, and the combined adjusted gross income determines the base obligation under the Child Support Schedule.

Missouri's Form 14 includes a parenting time adjustment based on overnight visits. The credit begins at 36 overnights per year with a 6% reduction and increases incrementally to a 34% reduction at 181–183 overnights annually. Courts may apply up to a 50% adjustment in specific circumstances. When parents share substantially equal parenting time, the guidelines require a separate calculation method under RSMo § 452.340.

Missouri allows child support modification when a substantial and continuing change in circumstances makes the current amount unreasonable under RSMo § 452.370. If recalculating support with updated income results in at least a 20% difference from the existing order, that establishes a prima facie case for modification. A new Form 14 must be completed with current financial information and filed with the court.

Beyond the base support amount from the Child Support Schedule, Missouri Form 14 adds work-related childcare costs, the child's health insurance premiums, and extraordinary medical expenses. Unreimbursed medical bills exceeding $250 per child per year are split proportionally between parents based on their income shares. These additional expenses are calculated on top of the base obligation and allocated by each parent's percentage of combined income.

Missouri's Child Support Schedule sets presumed amounts based on combined parental income and number of children, but does not impose a fixed statutory minimum or maximum cap. For very high-income families, courts may extrapolate beyond the schedule or exercise discretion under RSMo § 452.340. The Form 14 amount is a rebuttable presumption — either parent can present evidence that a different amount is appropriate.

Missouri child support generally terminates when the child turns 18. However, support extends to age 21 if the child is still in high school, enrolled in college or vocational school with at least 12 credit hours per semester, and completing at least half those hours. Support also ends upon the child's marriage, entry into military service, death, or becoming self-supporting. Children with disabilities may receive support beyond age 21.

Missouri enforces child support through the Family Support Division using wage garnishment, tax refund interception, license suspension (driver's, professional, and recreational), and passport denial for arrearages exceeding $2,500. Courts may hold a non-paying parent in contempt, which can result in fines or jail time. Missouri also reports overdue child support to credit bureaus, and liens may be placed on property or bank accounts.