Add 15% GST or extract embedded GST using New Zealand's official 3/23 statutory fraction with instant penny precision and multi-item quote builder.
Adds 15% GST to the net base amount
Inland Revenue requires multiplying by 3 and dividing by 23 to eliminate recurring decimal rounding errors on GST returns.
\text{Add GST (Exclusive to Inclusive):} \\
GST = Amount_{Excl} \times 15\% \\
Amount_{Incl} = Amount_{Excl} \times 1.15 \\
\\
\text{Extract GST (Inclusive to Exclusive):} \\
GST = Amount_{Incl} \times \frac{3}{23} \approx Amount_{Incl} \times 0.1304348 \\
Amount_{Excl} = Amount_{Incl} \times \frac{20}{23}Under New Zealand Goods and Services Tax Act 1985, standard GST is 15%. To extract the embedded tax from a GST-inclusive price, Inland Revenue specifies multiplying by 3 and dividing by 23 (15 / 115 simplifies exactly to 3 / 23). This guarantees zero rounding discrepancy compared to dividing by 1.15.
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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