When businesses like taco bell, petsmart or others ask you to round up to donate to a cause it is 100% for the tax write off they receive. They are allowed to donate money and pay less taxes. Instead of paying from their overall sales and profits they con customers to pay extra to do it for them. This leaves their overall sales intact while increasing their yearly profit by paying less in taxes. If you want to donate just do it yourself and give more then a buck.