I and wife have been tracking our expenses (and income) to a penny for more than 10 years now. It's easy when you don't have a lot of cash expenses and have a h

I and wife have been tracking our expenses (and income) to a penny for more than 10 years now. It's easy when you don't have a lot of cash expenses and have a habit of entering them every night you make them. Dealing with card and other electronic transactions is even easier. Convenient software also helps a lot. We use KMyMoney, but there are many good choices.