it depends. What kind of supporting data are you trying to enter? If you are trying to enter receipts or supporting documents that substantiate your donation, Turbo Tax does not have a place to enter that as the IRS doesn't require that you substantiate, unless you are subject of an examination. So keep all of this documentation handy if that occurs.
Here are IRS guidelines, that should answer your question in what documents to keep as well as the record keeping requirements. This is necessary in case if you are audited and need to present proof of your contributions.
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