Paying a large lump sum of income tax at the end of the financial year can be challenging. Provisional tax helps to spread out tax payments throughout the year instead. Provisional tax is a method of paying income tax in instalments during the year, based on an expected income. If the provisional tax paid exceeds the actual income tax liability, a tax refund is issued after the annual income tax assessment is completed. As of 2015, the threshold for provisional tax is $5,000 of residual income tax (RIT). If RIT is below this threshold, provisional tax does not need to be paid. To calculate provisional tax, an estimate of income for the upcoming year must be made. This process involves a degree of judgment and forecasting. There are four available methods (as of 2025) for calculating provisional tax, depending on the nature of income and business operations: 1. Accounting Income Method (AIM) Requires the use of AIM-capable accounting software such as Xero or MYOB. The software submits...