Know when GST registration becomes compulsory
Inland Revenue states that an entity carrying on a taxable activity must register for GST when taxable turnover was at least NZ$60,000 in the last 12 months or is expected to be at least NZ$60,000 in the next 12 months. Registration is also required if the business adds GST to its prices. Turnover should be monitored on a rolling basis rather than checked only at the end of the financial year, because rapid growth or a large new contract can bring the business within the rules sooner than expected.
The threshold applies to taxable supplies, not accounting profit. A business can have low profit but still exceed the registration threshold because its sales are high. Groups, branches, non-resident activities and unusual transactions may require specific advice. Before applying, confirm the legal entity, taxable activity, expected sales, first taxable period, balance date, contact details, bank account and whether the pricing model can accommodate GST.
Consider voluntary registration carefully
A business with turnover below the compulsory threshold may choose to register voluntarily if it carries on a taxable activity. Potential advantages include claiming GST on eligible business costs and presenting GST-inclusive pricing to GST-registered customers. However, registration also creates recurring obligations: GST must be charged where applicable, returns must be filed for every taxable period, records must be maintained and payments must be managed on time.
Voluntary registration should be assessed commercially, not just as a way to claim a refund on startup costs. If most customers are consumers, adding GST may affect price competitiveness or reduce the net margin if prices cannot be increased. If the business has mixed taxable and exempt activities, private use or significant overseas transactions, the GST treatment may be more complex. Obtain New Zealand tax advice before choosing the registration date or claiming pre-registration costs.
Choose the accounting basis and filing frequency
GST registration includes decisions about the accounting basis and filing frequency. The basis determines when sales and purchases enter the return, while the frequency determines the length of the taxable period. Inland Revenue provides rules for payments, invoice and hybrid bases and for monthly, two-monthly or six-monthly filing. Eligibility and compulsory settings depend on turnover and circumstances, so the current guidance should be checked when registering.
The selected settings must also be entered correctly in the accounting software. In Xero, the GST registration status, basis and reporting period influence the GST return. A mismatch between myIR and the ledger can create incorrect period selections, timing differences and confusing reconciliations. Save evidence of the approved settings and include them in the permanent client file so every return preparer uses the same basis.
Set up the ledger before the first return
Review the chart of accounts and tax rates before regular transactions are entered. Revenue, domestic costs, zero-rated sales, exempt income, imported services, capital assets, entertainment and private-use costs may require different GST treatment. Avoid relying on one default tax rate for every account. Bank rules and supplier defaults can improve efficiency, but they should be tested because automation can repeat an incorrect code across many transactions.
Create GST control accounts that are not used for ordinary manual postings. Reconcile the opening GST position, especially when migrating from spreadsheets or another system. If the registration date falls partway through an accounting year, separate pre-registration and post-registration transactions and identify any eligible pre-registration claims for professional review. The first return should include a detailed audit report and supporting schedule rather than only the total shown by the software.
Maintain a return calendar and evidence file
Inland Revenue generally requires the GST return and payment by the 28th of the month after the taxable period, with specific exceptions for periods ending 31 March and 30 November. A business must file a return for every taxable period, including a nil return. Build the due dates into a calendar and set internal cut-offs earlier so missing records and questions can be resolved before the statutory date.
For each return, retain the GST summary, transaction detail, reconciliation to the ledger, adjustments, supporting invoices and a list of technical questions. Confirm that the filed return agrees to the final accounting record and post any necessary journals. Good GST setup is not complete when the registration is approved; it is complete when the bookkeeping, review and filing process can be repeated accurately every taxable period.