Free Co Parenting Expense Split calculator with clear step-by-step results.
Splits shared child costs in proportion to each parent's income rather than fifty-fifty, which is the approach most child-support frameworks take. The care-time adjustment shows the gap between income share and overnight share, the usual starting point for any transfer payment between households.
Income share
Parent A share = Parent A income / (Parent A income + Parent B income)
Contribution
Parent A contribution = shared expenses x Parent A income share
Not legal advice. Child-support and expense-sharing obligations are set by statute, guideline formula or court order and vary widely by jurisdiction. Use this only as a discussion aid alongside proper legal guidance.
Most statutory formulas blend both: income determines capacity to pay, overnights determine who already bears direct daily costs. The adjustment figure shows where the two diverge.
Typically items outside routine care - orthodontics, school trips, sports registration or therapy. These are usually shared in the same income proportion but agreed case by case.