If I’m in the checkout at a business, say McDonald’s or Walmart or Kroger or whatever, and they ask if I’d like to round up to donate to some charity, I usually say yes. But should I be doing this? I heard somewhere that I shouldn’t because they can claim that as a donation from them which contributes to them paying less taxes or something, I’m not sure if that’s 100% how it works but I figure that it benefits them somehow or why else would they do that?