What evidence is needed for this question? "Do you have evidence to support the business/investment use claimed?" Do i need a receipt or proof i use it for my job

[MargaretL]

Yes, you do need any receipts, bank statements, credit card statements or mileage log to prove your job expenses. You don't need to send them to the IRS, but you do need to keep them for your records, in case the IRS asks for them.