Find your exact IRD tax code (M, ME, S, SH, ST, SA, CAE, WT) under Form IR330 guidelines and calculate secondary income tax withholding vs true end-of-year tax liability.
Determine the exact code to declare on your Inland Revenue IR330 form
Required by IRD to map you to the correct secondary bracket (S, SH, ST, SA, SM).
Primary income eligible for Independent Earner Tax Credit (up to $520/yr tax relief).
Simulate how different secondary codes impact your paycheck and avoid surprise IRD tax bills
Under code SH, only $2,625 is withheld, while your true tax liability is $4,707. You may owe $2,082 to IRD at year end. Switch your code to 'SA'.
True\ Incremental\ Tax = Tax(Gross_{Primary} + Gross_{Secondary}) - Tax(Gross_{Primary}) \\
Withheld\ Tax = Gross_{Secondary} \times Rate_{SecondaryCode} \\
Year\text{-}End\ Difference = Withheld - True\ Incremental\ TaxUnder IRD rules, secondary earnings are subject to a flat secondary tax code based on your estimated combined annual income. The difference between the PAYE deducted at the secondary flat rate and your true marginal tax bracket is reconciled in IRD's end-of-year tax assessment (auto-issued in May/June).
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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