This is a method of banking that my wife and I came up with before we got married and decided to join our finances. It's a very simple trick that we invented. Alright maybe other people have done it as well, but we're staking claim.
The Problem
First let me explain the problem. We realized that joining our finances could be a recipe for disaster. We'd have two salaries directly depositing into our checking account. We'd also have money coming in and out for wedding expenses from savings accounts and parents. Plus we'd have money going out for rent, student loans, debt, utilities, bills and daily expenses. We understood that it would be very easy for either of us to misread our balance and overdraw the account.