The Financial Reporting Act 20131 mandates the existence External Reporting Board. The External Reporting Board issues financial reporting standards2. The Board develops a financial reporting strategy3. However this is only for financial reporting purposes.
For tax reporting purposes, the tax administration act4 provides for IRD to use Order in Council5 to set out its requirements6 7
1.https://www.legislation.govt.nz/act/public/2013/0101/latest/DLM4632899.html
2.https://www.legislation.govt.nz/act/public/2013/0101/latest/DLM4632900.html
3. https://www.xrb.govt.nz/standards/financial-reporting-strategy/
4.https://www.legislation.govt.nz/act/public/1994/0166/latest/DLM5966518.html