Separate for us. We lived together for 3-4 years before getting married and just never bothered to combine them. My wife is very, very frugal so I don't worry about her spending more than she should. I make quite a bit more than her so I just pay for all bills and stuff when we're together, but she pays her student loan and anything she buys when I'm not with her. She does also put some money every month into a joint checking account we have, but neither of us spend from that account so we'll probably just end up taking a trip with it.
It's not perfect, but it works for us. Kids or a change in income could have us go to a joint account, but for now it works out pretty well.
It's not perfect, but it works for us. Kids or a change in income could have us go to a joint account, but for now it works out pretty well.