I spoke with a tax advisor regarding expensing chips since it is a cash transaction with no receipt. I was told that after a day of harvesting, put your chips together and take a photo of them. Make a note of the cost of the chips and store this information electronically and date it. If you are a large operation, QuickBooks is a great program. If not, a simple database or Excel spreadsheet would do just fine for tracking your business activity. He also began to explain that... as with everything else with the IRS, as long as you are well documented and everything seems reasonable you should have no issues, even if an audit comes up. I also keep a simple journal and scan my receipts since the print on thermal paper seems to disappear over time. That is why my TITOs are so faded