Missouri child support at a glance
- Guideline model: Income shares (Form 14)
- Income used: Each parent's gross income (Form 14, line 1).
- Shared parenting time: The revised Form 14, for orders entered after January 1, 2026, credits overnights starting at 36 a year: 6% for 36 to 72 overnights, rising in steps to 34% at 181 to 183 overnights. A court may go up to 50% if the result is unjust.
- When support ends: At 18; if the child is in secondary school, support continues to completion or age 21, whichever comes first, and it can continue to 21 with qualifying college or vocational enrollment (RSMo 452.340).
Official calculator or worksheet: Missouri Form 14 worksheet
Missouri's official tool is the Form 14 worksheet.
This page explains the rules; it does not calculate an order. Health insurance, child care, other children and deviations change the result. Use the official tool and confirm with a family-law attorney licensed in Missouri.