Offer your thoughts or opinion on the input financial query or topic using your financial background.

Should I collect receipts after paying with a card?
It surely doesn't HURT to keep a receipt. I tend to pile up receipts in my desk drawer, never look at them, and then every few months throw them all out. If a vendor writes a receipt by hand or if the cash register is not tied in to the credit card system, keeping a receipt could give you evidence against mistakes or fraud. Like if the vendor gives you a receipt for $10 and then sends a transaction to the credit card company for $20, you could use the receipt as evidence of the problem. But if the vendor is trying to really cheat you, the most likely thing for him to do is run the legitimate transaction through, and then some time later run a fake transaction. So say today you go to vendor X, buy something for $20, and he bills your credit card $20. Then a few days later he bills you another $100 even though you never came back to the store. Sure, you have a receipt for $20. But you don't have a receipt for the $100 because you never authorized that transaction. Your receipt proves nothing -- presumably you're not disputing the $20. If you complain to the bank or go to the police or whatever, saying, "Hey look, I don't have a receipt for the $100" doesn't prove anything. How do they know you didn't just throw it away? It's difficult to prove that you never had such a receipt.