From our understanding of the requirements, proof of payroll is required and 3 month’s payslips should be sufficient here. You can download all of your employees’ payslips for a particular month (or pay period) from the Pay Runs tab in SimplePay. Please take a look at this help article for more information.
If you would like to see this information in report form, you can download our Transaction History Report. This is likely not sufficient to qualify as proof of income but may be useful for your own checks and records. More information on using our reports can be found in this help article.