well in my understanding it is advisable to keep business accounts separate from personal accounts in any case. business expenses are made from the business acc

well in my understanding it is advisable to keep business accounts separate from personal accounts in any case. business expenses are made from the business account and personal expenses from the personal account. only income moves from the business account onto the personal account. if you and your wife both have their own business, then those of course should be separate from each other. you can still have a shared personal account if you like or not. that's completely unrelated.