Before you invest in a portfolio investment entity (PIE) such as a KiwiSaver scheme, you will need to provide your IRD number and Prescribed Investor Rate (PIR). If you do not provide your IRD number and PIR, the income derived on your KiwiSaver account will be taxed at the default rate of 28%. Your PIR is used to calculate the tax on income derived on your KiwiSaver account. You can determine your PIR by answering the following questions: