How to Split Child Expenses Between Co-Parents

Most co-parents settle on three rules: which costs are shared (often childcare, uninsured medical and dental, school and agreed activities), the ratio (50/50, or in proportion to income), and how often you settle (monthly or each term). Write the ratio down once and put all in the split column — exceptions like "we agreed 50/50 on these boots" get Maria; Sam.

Reimbursements and insurance

When insurance or a school pays something back, enter a negative amount on the row of the parent who received it, with the same split as the bill. When one parent pays the other, enter it as a row paid by them with only the other parent in the split — Kidtally treats it as a payment, not a shared cost.

Keep it checkable

Keep receipts, give each row a date and category, and send the other parent the statement. Your court order or agreement decides what's covered; Kidtally only does the maths.

The sample is fictional: co-parents Maria and Sam, two kids, January–June 2026, with an agreed ratio of Maria 60% / Sam 40%. 16 rows — daycare, the dentist, soccer, camp, piano, school costs, an insurance payback and one $1,500 payment from Sam to Maria. Shared child expenses come to $7,501.45. After the payment, Sam still owes Maria $600.37. At 50/50 instead it would be $1,337.67.

Last reviewed 2026-11-04. General information, not legal or financial advice.