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My business is software development (but software that runs on specialized hardware/equipment).

Re: Postage=office expense, since I don't have a separate office space...doesn't this category need to be 0?  The instructions say that this is "related only to your office space..."

Re: "In general, after $200 and a useful life greater than one year, items begin to move into the asset section and can't be expensed in one year (they are depreciated)." - I typically take the De Minimis Safe Harbor election, to be able to expense items up to $2500.

Re: "A $500 item may be a supply for one business and an asset in another," I guess that's really the crux of my question: how do you define what a "supply" actually is?  What kind of item might be a supply for one business but not a supply for another?

Why would you say that i.e. tools would be a supply, but cases & headphones wouldn't?