Why do parts stores charge a core charge when you bring in the old parts before you take the new part? I purchased two rear calipers for a neighbors 1969 Corvette. The calipers were $64 each , but the core charge was $80 each. In Ohio, for some reason, sales tax is not refunded on a core charge. This cost my neighbor $13. I asked the counterman why I was being charged a core charge when I brought in the cores when I bought the new parts. He said that is store policy. This happens at all of the part stores around here. This kid stated that the state of Ohio required a core charge. I asked him if he understood the reason for a core charge. He said "Yes, it's a tax the state charges". I explained to him that a core charge is charged so that they get the old part back so that it can be rebuilt and resold. He said that he never heard of that!