Contractor Tax to set-aside
Put aside a practical allowance for income tax and GST as a self-employed contractor.
Use this calculatorPROV · New Zealand · 2026–27
NZ provisional tax calculator & payment dates
Compare the standard uplift method, an estimate based on expected residual income tax, or an AIM cashflow allowance.
Live planning estimate
Add the figures you know.
The result updates immediately. No contact details are required and nothing is submitted to KGA.
General information only, not tax or financial advice. Settings checked 13 August 2026. Your circumstances, tax code, filing dates or ACC cover can change the result.
Put the result in context
Want a payment plan based on the actual accounts?
KGA can review the method, filing history, GST frequency, tax pooling options and cashflow before the next instalment is due.
Review my provisional tax Call 09 425 8536Complimentary initial business review · Warkworth or Zoom
Before relying on the estimate
Questions this calculator cannot decide alone.
When does provisional tax start?+
The tool flags when residual income tax is $5,000 or less. Your filing position and other circumstances still need to be checked.
Are these dates right for every business?+
No. The dates shown are standard patterns for a 31 March balance date. Balance date, GST frequency and extension-of-time arrangements can change them.
Is the AIM split the amount Inland Revenue will assess?+
No. The even split is only a planning allowance. AIM-capable accounting software calculates filed amounts from actual accounting income.