<prompt> Human: I only use it for online purchases and use a separate card for ATM transactions and other activities.If I was to memorise the number, security code and expiry date is there any disadvantage, legal or otherwise, to destroying it? I am conscious of the fact that if it were stolen its very likely Id lose money before I noticed it was gone but if it only exists in my memory then it is far harder to steal.Edit: thanks to the responses made, I will not be destroying it.Assistant: Just file it away at home in your desk drawer...? What if a situation comes up where you do need to use your credit card and they only accept physical swiping of the card?Human: I have yet to have to buy anything on a credit card but that is a future possibility.  <response>: Just keep it safe, you never know when youll need it. And as others mentioned. You wont be liable for any fraudulent charges on your card if reported in a timely manner. 