Hello MNDesign
The formula for determining Cost of Goods Sold (COGS) is based off this: Beginning Inventory + Purchases = Ending Inventory + COGS, thus making the formula for COGS being: COGS = Beginning Inventory + Purchases - Ending Inventory. In the TurboTax software, the formula set up will be there. Thus, you will enter the purchases for these incidental items and materials under purchases, or specifically the area that will specify cost of supplies, materials, etc. Based on what you mentioned about not tracking inventory, you will enter beginning inventory as 0, ending inventory as 0, and your purchases will be whatever the cost to you for the materials