Ask your CPA what evidence he or she will want to see. The CPA's requirements might be different from the IRS's requirements.
This TurboTax AnswerXchange forum is run by Intuit, the maker of TurboTax, to help it's customers use TurboTax to prepare their tax returns. If you are having your tax returns prepared by a CPA, you should be asking the CPA your questions.
