When a non-business bank sends you money, add an option to mark it as an IOU and show it as an outstanding payment in the payments tab and under the main account’s card
This is perfect for those times you’re caught short and borrow some cash from a friend or family member with the promise to pay them back, and could even show up as a reminder for the person who sent you the money, next to the split bill box in payments if they’re on Monzo!