Recommend opening a JT current & JT Savings account.
Stick a set amount each into the JT current account - enough to cover mortgage/rent, all utilities, insurance, petrol, all groceries (excluding booze), kids expenses etc, allowance for joint discretionary spend (dinners you both attend, drinks when you're out, movie tickets etc).
Any monthly surplus/underspend can be moved into the JT savings account.
I'm amazed the amount of couples that don't do this.
- Do not use the jt account for nights out when your partner isn't there,
- Do not pay for domestic booze on the JT account (my wives wine is considerably more expensive than my few beers),
- Do not use the JT account for furniture unless both parties have agreed to whatever is being bought.
It's not rocket science but it can remove the often relationship challenging problem of one party thinking they're paying for everything.