You won't need to "prove" anything to the IRS is you're using the Standard Deduction. That's a given amount from the government. Support documentation is required, however, if you itemize your deductions and the IRS requests those documents.
Of course, you'll still save your W-2s, 1099's, etc. But you won't need any proof of personal deductible expenses.
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*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
