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Unless of course your accounting system is on a cash (rather than accrual) basis.
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Actually from a cash basis, Income tax standpoint ( or even a manufacturing/accounting standpoint) the Invoice generation is still NOT the trigger for sale recognition. It is completion of the transaction/contract. If you deliver the guitar and then Invoice the customer two weeks later the sale was NOT the two week later date but rather the date the guitar was delivered/accepted. This, again are the types of things the IRS looks for to "catch" "mistakes" that people make on their returns...it's a recognition/timing type error. They always want you to recognize income as soon as possible so you owe the tax... like I said this is much more complicated than I can explain here...
just when you thought you understand...let me say this...if you have a system of accounting that is DIFFERENT from the "norm" but it more accurately and consistantly recognizes/reflects income you can convince an IRS agent that it is appropriate.
One of the biggest problems most Luthiers have isn't recognition of income but rather how to properly compute income because of a poor inventory valuation system..."cost of goods sold". Many don't track their purchases (or can't...you bought 50 tops for one price and put them in with the other 150 tops already in inventory) acurately or correctly when computing the CGS for the sale...in other words their real basis in the item sold is unknown.
Isn't this FUN