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@Dilip Sarwate the stock deduction is the deduction from income because of the donation of stock to a qualifying charitable institution. For a stock held long term, the value of the deduction from income is the value of the stock when it is donated.
@littleadv Thanks for making it clear that, for 2021, charitable deductions of 100% of AGI still apply. Another point to mention is that the allowable ceiling of 30% of AGI for stocks and some other non-cash contributions still applies.