Child support modifications in Missouri allow either parent to request a change (increase, decrease, or termination) to an existing support order when circumstances have changed significantly. The process is governed by § 452.370, RSMo, and in Jackson County (16th Judicial Circuit, including Lee's Summit), the Family Court applies this statute consistently with statewide guidelines. Legal Standard for Modification (§ 452.370)To modify child support, you must prove two main things: A substantial and continuing change in circumstances has occurred since the last support order. Common qualifying changes include: Minor fluctuations (e.g., temporary unemployment) usually do not qualify. The change must be substantial (meaningful impact) and continuing (not temporary). Significant change in either parent's income (job loss, promotion, new job, disability, retirement). Change in the number of children receiving support. Change in custody/parenting time arrangement (e.g., shift to joint physical custody with overnight credit adjustment). Change in the child's needs (e.g., extraordinary medical, educational, or extracurricular expenses). Passage of time leading to natural increases/decreases in costs (though courts require more than just inflation or aging). Other factors like incarceration, remarriage (if it affects income), or failure to exercise agreed parenting time. The modification is necessary to make the order reasonable under current circumstances. The court re-calculates support using the current Form 14 guidelines (income shares model) and determines whether the presumed amount is "just" or should be deviated from. The Process in Jackson County File a Motion to Modify Child Support — Include an affidavit detailing the substantial change and attach a proposed new Form 14 calculation. Serve the Other Parent — They have time to respond or file a counter-motion. Financial Disclosures — Both parties must exchange updated income/expense information (often via Form 11 or discovery). Mediation — Often required or encouraged if parenting time changes are also at issue. Guardian ad Litem (GAL) — May be appointed if custody/parenting time is also contested. Hearing — Present evidence of the change (pay stubs, tax returns, medical bills, etc.). The court applies the current Form 14 and decides whether to adopt the presumed amount or deviate. New Order — If granted, the modified amount is retroactive to the date the motion was filed (or service, depending on circumstances). Common Outcomes Increase — Often granted when the paying parent's income rises significantly or the receiving parent's costs increase. Decrease — Common when the paying parent's income drops substantially (e.g., job loss) or parenting time shifts to more equal (overnight credit). Termination — Automatic at age 18 (or 21 if in college/full-time student), emancipation, or death—though a motion may be needed for formal termination. Deviation from Form 14 — Courts can deviate if the presumed amount is unjust (e.g., true 50/50 time with minimal support, extraordinary expenses, or income imputation). How a Local Lee's Summit Attorney Helps with Child Support Modifications A local Jackson County attorney provides real advantages: Accurate Form 14 Preparation — Ensures correct income calculation, credits (overnights, insurance, childcare), and deviations—avoiding errors that lead to unfair amounts. Proving Substantial Change — Helps gather and present compelling evidence (financial records, employment verification, parenting logs) that meets the strict threshold. Local Court Insight — Knows how Jackson County judges apply the statute, handle deviations (e.g., overnight credits in joint custody), and weigh income imputation or extraordinary expenses. Countering Disputes — Anticipates and rebuts the other parent's claims (e.g., hidden income, exaggerated needs) through discovery and strategic argument. Efficient Resolution — Often negotiates settlements or mediates effectively—reducing costs and time compared to full hearings. Retroactivity & Enforcement — Ensures modifications are retroactive to filing date when appropriate and sets up proper enforcement mechanisms. Without local guidance, many motions fail because they don't clearly prove a "substantial and continuing" change or mishandle Form 14 calculations. If you're seeking or facing a child support modification in Jackson County, contact the Law Office of Kirby Minor for a consultation. We assess whether your situation meets the standard, prepare accurate calculations, and advocate aggressively for a fair outcome. Call or text 816-888-0632 today. Child support should reflect current reality—let's make sure it does.