This has been made so much easier with online accounting software.
Save your email address to your software inbox in your email address book. Every business invoice or piece of business documentation can then be sent to your software via your email, processed, and you have a permanent record of a transaction. If you were ever audited by the ATO every transaction has the correct supporting documentation, which means that any audit is short and the associated costs are significantly less.
You don’t need storage boxes and filing cabinets as much any more. Everything can be stored in the cloud which, again, results in cost savings.
When your bookkeeper or accountant asks you to send in documents, simply send the requested documents to your accounting software. The boookkeeper/accountant can access the correct information easily, with no time delays and of course, financial benefits to you.