How is child support calculated in Missouri?

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Missouri   child support   is governed by   RSMo § 452.340   and   Missouri Supreme Court Rule 88.01  , which require completion of   Form 14   — the Presumed Child Support Calculation Worksheet — in every case.    1. The Form 14 Calculation   Form 14 is a 12-line worksheet that performs an   Income Shares   computation: -   Line 1  : Monthly gross income of each parent. -   Line 2  : Adjustments (other court-ordered child support actually paid, maintenance paid). -   Line 3  : Adjusted monthly gross income. -   Line 4  : Combined adjusted gross. -   Line 5  : Proportionate shares. -   Line 6  : Basic child support amount from the   Schedule of Basic Child Support Obligations  . -   Lines 7-9  : Childcare costs, health insurance, uninsured medical/extraordinary. -   Line 10  : Total combined obligation. -   Line 11  : Each parent's presumed share. -   Line 12  : Adjustment for   overnight periods of custody/visitation  .    2. Overnight Adjustment (Form 14, Line 12)   The non-custodial parent receives an   overnight visitation credit   ranging from: -   0% credit   for 0-35 overnights/year -   6% credit   for 36-72 overnights -   9% credit   for 73-91 overnights -   10% credit   for 92-109 overnights -   20-30% credit   for 110+ overnights, with greater credits for substantially shared parenting.    3. Schedule Range   The Schedule covers combined adjusted gross incomes up to   $30,000/month  . Above that, the court has discretion based on the child's needs.    4. Duration (RSMo § 452.340.5)   Support continues until the child: - Reaches   age 18   (general rule), OR - Reaches   age 21   if still   enrolled in and attending high school  , OR - Is   enrolled in a vocational/higher education program   with at least 12 credit hours, in which case support continues to   age 21   (or   age 22 / completion of degree  , whichever first).  The college continuation requires the child to maintain enrollment, provide grade transcripts, and meet other statutory benchmarks.    5. Rebuttal (Rule 88.01(b))   Form 14's amount is   rebuttably presumed correct  . The court must enter a written or specific finding that the Form 14 amount is   unjust or inappropriate   to deviate.    6. Modification (RSMo § 452.370)   Modification requires   substantial and continuing change   in circumstances. A statutory   20% rebuttable presumption of substantial change   applies when guideline recalculation differs by 20% or more from the existing order.    7. Imputation   Imputed income is allowed for voluntary unemployment/underemployment, often based on full-time minimum wage as a starting point.  This is legal information, not legal advice.