Missouri uses Form 14 — an income shares model based on both parents’ gross incomes. A presumed child support amount is calculated using a published worksheet. Courts may deviate from Form 14 if it would be unjust or inappropriate.
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Missouri calculates child support using the Income shares model established under Missouri Supreme Court Form 14. This is a statutory formula that leaves limited room for judicial discretion on the base calculation amount, ensuring consistency and predictability for families across the state.
Form 14 worksheet: gross income of both parents combined, adjustments for taxes and mandatory deductions, basic obligation from schedule, split proportionally.
The calculation begins with determining each parent's net disposable income, which includes virtually all sources of income minus taxes, mandatory payroll deductions, and certain hardship deductions. The court then applies the statutory formula using the time each parent has primary physical responsibility for the children and the applicable income allocation brackets.
Beyond the base formula amount, Missourirequires additional contributions for mandatory add-on expenses. These typically include childcare costs necessary for the custodial parent's employment or education, uninsured healthcare expenses for the children, and in some cases, educational and travel costs. These add-ons are split between parents in proportion to their respective incomes.
Primary statute: Missouri Supreme Court Form 14
Form 14 worksheet-based calculation using both parents’ gross incomes.
Presumed child support amount — court may deviate if unjust.
Health insurance and childcare costs included in calculation.
Parenting time credits for substantial overnights.
Missouri uses "dissolution" terminology, not "divorce."
Commingling does NOT automatically convert separate to marital property — owner's intent matters (RSMo §452.330(4)).
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Residency Requirement
90 days residency (RSMo § 452.305)
Mandatory Waiting Period
30-day waiting period after service (RSMo § 452.320(3))
No-Fault Ground
Irretrievably broken
State Income Tax
Progressive 1.5–4.8% (2025 rate reduction)
Missouri uses the Income shares model under Missouri Supreme Court Form 14. Missouri uses Form 14 — an income shares model based on both parents’ gross incomes. A presumed child support amount is calculated using a published worksheet. Courts may deviate from Form 14 if it would be unjust or inappropriate.
Key factors include both parents' income, the number of children, custodial time share, mandatory add-on expenses (childcare, health insurance), and any applicable deductions. Form 14 worksheet-based calculation using both parents’ gross incomes.
Yes. Either parent can request a modification if there has been a material change in circumstances, such as a significant change in income, custody arrangements, or the needs of the child. The court will recalculate support using the same statutory formula.
Form 14 worksheet: gross income of both parents combined, adjustments for taxes and mandatory deductions, basic obligation from schedule, split proportionally.
Get a personalized child support calculation based on Missouri's actual statutory formula.
Start My Free MissouriEstimate →This tool provides educational estimates based on Missouri family law and does not constitute legal advice. Child support calculations are approximations of the statutory formula and may differ from court-ordered amounts. Consult a licensed Missouri family law attorney before making decisions. Primary statute: Missouri Supreme Court Form 14.