The choice changes when transactions enter the return
A GST accounting basis determines the point at which sales and purchases are included in the GST return. New Zealand businesses may use the payments, invoice or hybrid basis when eligible. The best choice depends on turnover, customer payment patterns, supplier terms, systems and cash flow. It is not simply an accounting preference: the selected basis changes the timing of GST payable and GST claims, so the choice should be confirmed with a New Zealand tax adviser.
The accounting system must match the basis registered with Inland Revenue. If myIR shows payments basis but Xero is configured for invoice basis, the draft return can include transactions in the wrong taxable period. Save the approved basis in the permanent file and review it after major changes in turnover, business model or transaction volume.
Payments basis focuses on cash movement
Under a payments basis, GST is generally recognised when money is received or paid. This can align GST cash flow more closely with customer collections and supplier payments, which may be helpful for smaller businesses with slow-paying customers. However, the bookkeeping must accurately match receipts and payments to invoices and bills. Unallocated receipts, duplicated cash entries and incorrect bank reconciliation can directly affect the return.
A payments-basis business still needs complete invoices and bills for control and evidence. It should reconcile customer and supplier balances and investigate transactions paid in instalments. At year-end, the annual accounts may use accrual accounting even though GST is reported on payments basis, so the workpapers need to explain the difference between accounting revenue or expenses and GST timing.
Invoice basis uses the invoice or supply timing rules
Invoice basis generally brings transactions into the GST return based on invoice or time-of-supply rules rather than cash settlement. This can suit businesses with strong invoicing systems and reliable receivables, but it may create a cash-flow burden where GST becomes payable before customers pay. Accurate invoice dates, credit notes and cut-off are therefore essential.
The GST review should reconcile sales invoices, purchase bills, receivables and payables. Old unpaid invoices may require separate consideration, including bad-debt rules where relevant. Changes to invoice dates after a return has been filed can move GST between periods, so access controls and lock dates help preserve the integrity of completed returns.
Filing frequency affects workload and cash planning
GST returns may be filed monthly, two-monthly or six-monthly depending on eligibility and circumstances. More frequent filing creates smaller periods and can provide faster refunds for businesses with significant input tax, but it also increases the number of bookkeeping cut-offs and reviews. Less frequent filing reduces the number of returns but can produce larger payment obligations and a heavier reconciliation task at each due date.
The right frequency depends on turnover, transaction volume, cash flow, seasonal activity and the quality of the bookkeeping process. Inland Revenue may require a particular frequency at higher turnover levels, and businesses can apply to change when eligible. Update the software and the compliance calendar immediately after any approved change.
Review the settings as the business grows
A basis or frequency selected at startup may no longer suit a larger business. Review customer credit terms, supplier payment cycles, transaction volumes, refund patterns and internal close capability. If the business regularly struggles to complete a two-month period, moving to six-monthly filing may not solve the underlying bookkeeping weakness; it may only delay the reconciliation and increase the size of the eventual problem.
Before changing, prepare a transition plan covering the final old period, the first new period, system settings and any overlap. Confirm the effective date in myIR and retain the approval. The objective is a return process that reflects the registered rules, supports cash planning and can be completed accurately before every due date.