Know how much you're spending each month? Know how much you SHOULD be spending each month? Well, it clearly helps to have a budget. It's good to know how much you're spending and on what, but where do you get started? It helps to have an idea of how much you should be spending each month on drinks with friends or how much you're saving for retirement. On today's episode, I try to tackle an easy way to think about budgeting. The 50-30-20 rule.