Originally posted as a Twitter thread on July 10, 2019

Credit card hack: rather than saving restaurant receipts to make sure I was charged correctly, code the tip. Eg if one’s digit on total is an odd number, cents on the total should be $.57, if even it should be $.42. Leave tip so total adds up to $.42 or $.57 every time.

So when bill comes, if you have a “non-matching” number, you get cheated and can lodge a protest with CC company. And of course the restaurant is supposed to keep your signed receipt as proof, so you don’t have to 🙂

I find that I get cheated every now and then, but don’t want to carry and reconcile receipts at the end of the month nor even think about it. Much easier way!

Clarifying: when your credit card *statement* comes, look for “non-matching” totals (per your own algorithm; mine is not $.42 and $.57, keeping it secret!) and then lodge a complaint if off