text: does anyone know anything about child supports laws in missouri? i need to find out about child support laws in missouri. i always thought the child had to be in school for the custodial parent to receive child support. click on you state link to find cs laws specific to mo.  normally the payer pays until the child is 18 and graduated, or 18 and no longer pursuing a high school diploma.  however, you would need to check your specific order as there are exceptions made on some orders.  http://www.acf.hhs.gov/programs/cse/extinf.html