Calculate Inland Revenue (IRD) child support under the 8-step formula: compare parental income shares against care nights percentages and child expenditure tables.
$132.48 /week equivalent
Paying Parent
73 nights/yr provided
1 children combined cost
Gross taxable income for each parent and annual nights of care.
Income shares, care percentages, and assessment.
\text{CS Income} = \max(0, \; \text{Taxable Income} - \text{Living Allowance } (\$29,863)) \\
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\text{Income \%} = \frac{\text{Parent CS Income}}{\text{Combined CS Income}} \\
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\text{Child Support \%} = \text{Income \%} - \text{Care Cost \%} \\
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\text{Annual Assessment} = \text{Child Support \%} \times \text{Expenditure on Children}Under the NZ Child Support Act 1991, Inland Revenue uses an 8-step income-shares formula. Each parent's taxable income minus the statutory living allowance ($29,863 for 2024/2025) yields their Child Support Income. The parent's income percentage minus their care cost percentage determines their Child Support Percentage, which is applied to the official Expenditure on Children table.
All calculations, amortizations, and scenario projections displayed on this page are strictly for informational and educational purposes. Nothing herein constitutes investment, financial, tax, or legal advice. Actual Reserve Bank of New Zealand (RBNZ) interest rates, IRD PAYE brackets, ACC Earner's Levy, KiwiSaver regulations, and lender criteria may vary. Calconova explicitly disclaims all liability for any decisions taken based upon these calculations. Consult a qualified financial advisor, CPA, or official Inland Revenue documentation prior to executing financial commitments.
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