NZ·Tax year 2025 · Filing 2026

New Zealand tax deadlines 2026.

Every individual and self-employed income tax deadline for New Zealand in 2026. Plus recurring VAT / GST / sales tax filings. Each deadline links to notes on how to file, what people miss, and matching open-source tax skills.

New Zealand tax authority

Annual deadlines

1 this year

Jul7

Individual Tax Return (IR3)

NZ individual income tax return for the 2025/26 tax year (April 1, 2025 – March 31, 2026). Provisional taxpayers have additional mid-year instalment deadlines.

New ZealandAll residentsSelf-employed

Open-source skills for New Zealand

Prepare this return with open-source skills

These skills are in the OpenAccountants repo. Clone them into Claude, Cursor, or any AI agent and they handle the computation.

new-zealand-gst.mdNZ

Use this skill whenever asked to prepare, review, or classify transactions for a New Zealand GST return (GST101A form) for a self-employed individual or small business in New Zealand. Trigger on phrases like "prepare GST return", "do the GST", "fill in GST101A", "create the return", "New Zealand GST", "NZ GST", or any request involving New Zealand GST filing. Also trigger when classifying transactions for GST purposes from bank statements, invoices, or other source data. This skill covers standard GST-registered persons under the invoice or payments basis. Financial services elections, GST groups, non-profit bodies, and complex change-of-use adjustments on high-value mixed-use assets are in the refusal catalogue. MUST be loaded alongside vat-workflow-base v0.1 or later (for workflow architecture). ALWAYS read this skill before touching any NZ GST work.

Preparing a New Zealand return?

The OpenAccountants repo has verified, open-source tax computation skills. Clone and run them with your AI agent, then get an accountant to review.

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