[header] How to complete a business activity statement [title] Maintain accurate business records. [step] If you don't have an accountant, record all your business sales and purchases on a daily basis. This will make it easier to complete your bas. 
It will also help ensure that you don't miss anything that requires you to make a correction or adjustment. [substeps] If you're keeping your books on your own, you can use accounting software to make it easier to record transactions.