The easiest answer to this is zero. Credit cards should not be used as a way to finance purchasing anything, because the interest rate and finance charges are too high ever to justify it. If you were to use a card to buy an expensive TV, it will end up costing you twice the original price if you use a credit card and pay the monthly minimum payment and “finance” the purchase. Credit cards should only be used to make purchases for an amount you can pay off entirely each month.