When two parents share joint physical custody, child support is determined pursuant to the Wright v. Osburn (http://caselaw.findlaw.com/nv-supreme-court/1091154.html) offset. Depending on how many children there are, the courts will take a percentage (18% for one child, 25% for two children, etc.) of Mother’s Gross Monthly Income (GMI) and subtract it from the same percentage of Father’s Gross Monthly Income. For example: Mother makes $6,500.00 GMI per month x 18% (for one child) = $1,170.00 Father makes $5,000.00 GMI per month x 18% (for one child) = $900.00 Mother would owe Father $270.00 per month for child support