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@KathrynG3 ,

     Thanks for your reply. I'm interested in the first thing you mentioned. When I do as you suggest, Line 10b is blank, but if I delete my two cash charitable donations (both above $300) my owed tax goes up, and when I add them back, it goes down for the first one but not the second. I'm very confused. One of the two cash donations is $2500, if that has anything to do with the 2500 shown here.