Child Support
Calculator
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NZ Child Support Estimator
Based on
Inland Revenue Formula Assessment (2025)
Tax Year 2025
Parent 1 (You)
Annual Gross Income (Taxable)
Care (Nights per Year)
Living Allowance Deduction
Default $28,612 (Single/Partnered)
Parent 2
Annual Gross Income (Taxable)
Children
Aged 0-12
Aged 13+
Living Allowance Deduction
Calculate Assessment
Official New Zealand Resources
Inland Revenue Tools
Inland Revenue (IR) Calculator
Child Support Act 1991 (Legislation)
Guides & Tables
Helping you understand Child Support (IR100)
2025 Expenditure Tables