My wife and I have a shared account and she has a personal account, only because her works HR department is useless as shit and haven't changed her direct deposit to our joint account. I also have my business account, thankfully it makes enough money now to support itself and I don't have to keep funding my business.
When it comes to big purchases we ask each other if you can afford it then go buy it if we can. We had separate accounts when we were just living together before getting married and it was a pain in the ass to pay rent and bills but we weren't at the stage to get a joint account yet. Once we got married we started merging things. We still have separate credit cards though. That's more of a lazy thing then a trust thing.
When it comes to big purchases we ask each other if you can afford it then go buy it if we can. We had separate accounts when we were just living together before getting married and it was a pain in the ass to pay rent and bills but we weren't at the stage to get a joint account yet. Once we got married we started merging things. We still have separate credit cards though. That's more of a lazy thing then a trust thing.