Hi, My understanding is if you are running a business ( over $20,000 last year turnover, Ebay reports your activities to the Australian Tax office ) you are required to lodge a tax return including a stocktake of all stock on hand at June 30th. The $20,000 figure is not a finite level as if you are buying and selling items in a business like manner to achieve a profit, you can still be deemed to be running a business, regardless of turnover. On my main Ebay account I scroll to the bottom of listed items pages, add up total value for all listed items ( around 1600 listings ) and divide by average mark up percent to arrive at stock value. I add an estimate for unlisted items in storage and use this figure for tax purposes. If your business is growing it is important to start this process, as growing stock value is considered profit for tax purposes. If you ignore this for a few years you may end up with a nasty tax obligation a couple of years down the track. I run several businesses both online and regular B&M, so have a reasonable idea of tax obligations. If you lodge a tax return for Ebay sales I would encourage you to list stock on hand at June 30. Hope this helps.