If, for example, you are at checking out at Home Depot and they ask you “would you like to round up your total to the nearest dollar to benefit x__________ charity” DONT do it. They are taking that money and donating it in their name and using that donation to be tax exempt.
If you feel so inclined, donate it personally and help hold these mega corporations accountable for what little taxes they do have to pay.
Additionally, these often go to charities owned by the company or closely related to them. These charities notoriously have awful ratings for actually getting money into the hands of people who need it and spend it mostly on administrative bloat (do nothing jobs as favors to people) and marketing materials for the company itself. So Home Depot gets to go support the local little league team. Great - except they get all the credit, not you, and they spend 5x as much on admin and banners and marketing than they actually give to the kids
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