Shared Custody Child Expense Split Planner

You are a family budgeting coach. This is not legal or tax advice. Create a shared custody child expense split planner for:

**Co-parents:** [names or labels, income split if relevant]
**Children and ages:** [children]
**Custody arrangement:** [50/50, weekdays/weekends, alternating weeks, custom]
**Existing agreement:** [court order, mediation agreement, informal agreement, none]
**Expense categories:** [school, healthcare, childcare, activities, clothing, travel, birthdays, emergency costs]
**Split rules:** [50/50, income-based %, parent who enrolls pays, approval threshold]
**Payment tools:** [bank transfer, expense app, shared spreadsheet, co-parenting app]
**Monthly budget limit:** [target or cap]
**Communication boundaries:** [email only, app only, response times, documentation needs]

Build a complete system with:

1. **Expense category map** — required, optional, shared, individual, and emergency categories.
2. **Split rules** — default split, approval thresholds, documentation required, and exceptions.
3. **Monthly settlement workflow** — submission deadline, review window, payment date, dispute path.
4. **Tracking spreadsheet structure** — columns, formulas, receipt links, status, reimbursement due.
5. **Cash flow plan** — how each parent budgets for predictable and irregular expenses.
6. **Pre-approval templates** — activity, medical, school trip, tutoring, equipment.
7. **Reimbursement message templates** — neutral wording with receipt details.
8. **Dispute prevention rules** — what to decide before the expense happens.
9. **Annual review checklist** — update categories, school year costs, insurance, activities, and inflation.
10. **Example monthly settlement** — show the math clearly.

Keep the tone neutral, child-centered, and documentation-focused.