As someone who's been working on guitars and basses for a long time, I have one of those boxes of stuff. Screws, knobs, pots, bridges, tuners, and other spare parts. I bought all of them, in some form, and for 99% of them, new, with taxes paid. Those receipts are all in the trash. It seems obvious that I can use these parts when repairing my instruments or those of others. What I'm less sure of is using unused "new" parts, like bulk in-stock pots in my parts box, on a build I'd like to sell as a new instrument.
On one hand, it seems like a good idea to have receipts for the parts I bought for a given new project, correlating those parts to a specific build, showing the taxes I paid on them. On the other hand, it would be nice to use the stuff in my spare parts box. In the middle, I could buy parts in bulk and keep records for them, and separately keep records for the sale of the projects I build from the parts, which I assume is what larger manufacturers do. If we were talking about building and selling a titled object, like a new boat or trailer, I know I'd have to be able to prove I paid taxes on all of those parts, but I'm not sure about something like musical instruments.
Which approach do you use or suggest?
On one hand, it seems like a good idea to have receipts for the parts I bought for a given new project, correlating those parts to a specific build, showing the taxes I paid on them. On the other hand, it would be nice to use the stuff in my spare parts box. In the middle, I could buy parts in bulk and keep records for them, and separately keep records for the sale of the projects I build from the parts, which I assume is what larger manufacturers do. If we were talking about building and selling a titled object, like a new boat or trailer, I know I'd have to be able to prove I paid taxes on all of those parts, but I'm not sure about something like musical instruments.
Which approach do you use or suggest?
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