a question for your accountant or for you to read up on ATO site, all depends on your circumstances, your job, the requirements (such as uniform, travel, etc). just because you dont need receipts doesnt mean you're eligible to claim something, doesnt mean you wont get in huge trouble if you get audited and cant justify the claims. normally for most of the no-receipts thresholds, its just because its unmanagable or unreasonable to do so (e.g. keeping receipts for the electricity, water, and fabric powder components of washing a required work uniform)
does your questions have some relevance to investing?