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Taxreceipt.co.nz Methodology
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method.md

Taxreceipt.co.nz Methodology

All calculations on this website are based off the 2023 Budget Economic and Fiscal Update published by treasury.govt.nz and is verifiable on this GitHub repository

Data was pulled from the PDF, then aggregated and stored at https://github.com/waltzaround/tax-receipts/blob/master/src/values.json

Figures are taken from Core Crown Expense Tables using 2022 Actual Spend Figures and calculations work as follows

This website doesn't account for borrowing, appropriations, and spending for the current year as the only data available for current year spending are forecasts, and subject to change.

Total tax contribution

Calculated from income tax + GST contribution + any other tax obligations

Income tax calculation verifiable at https://github.com/waltzaround/tax-receipts/blob/4d45a1ec3adcf3c4831a4e02b9c3dca9381b9d32/src/App.tsx#L87

GST is total spend mulitplied by 0.15

Classification total spend:

Classification amount ie: Health divided by Total 2022 Core Crown Expenses multiplied by total tax contribution

Verifiable at https://github.com/waltzaround/tax-receipts/blob/4d45a1ec3adcf3c4831a4e02b9c3dca9381b9d32/src/App.tsx#LL202C26-L202C26 and https://github.com/waltzaround/tax-receipts/blob/4d45a1ec3adcf3c4831a4e02b9c3dca9381b9d32/src/App.tsx#LL222C29-L222C29

Line item spend:

Line Item amount ie: Primary Schools, Secondary Schools divided by Total 2022 Core Crown Expenses multiplied by total tax contribution

Verifiable at https://github.com/waltzaround/tax-receipts/blob/4d45a1ec3adcf3c4831a4e02b9c3dca9381b9d32/src/App.tsx#L222

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