Where do I enter equipment purchased for my customers? Example, Purchased a TV and installed it for them. I charged them labor and for the TV. Didn't make the full amount

[JulieCo]

If you sell items intermittently along with the services you provide and do not keep any items in inventory, you can enter the purchases of those items as business supplies.  See steps below to add business expenses plus sample screenshot attached.  

Here are the steps to access the section in TurboTax to enter your self-employed business expenses:

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