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Are self-driving cars a traveling expense deduction or taxable income, and how would the car report this?
(worldwideinterweb.com)
General rules:
Exceptions may be made at the discretion of the mods.
Per diem is the first thing I thought of.
That's usually what I do, but because of some bureaucratic reason I never understood, some projects don't allow per diem, so we have to provide specifics instead.