Our salaries go into our own private account. I transfer X amount to my partner for utilities and contribution to (his) mortgage. We both transfer the same amount into a joint account for household costs/holidays/child costs.
My daughter isn't his so I pay for childcare with Childcare vouchers (can't get childcare vouchers if you have no parental reposibility, it makes sense tax wise for us to do this (circa £150-£200 a month so not huge amounts))- all other expenses (clothes, parties, birthdays etc) we split.
The house isn't mine so I pay 50% of the utilities but only a token amount towards the mortgage.(would be unfair for me to pay into my partners equity without a stake in that equity but I don't expect to live for free) The child costs and the house costs split work out pretty evenly in the end.
My partner earns more than double my wage but contributes significantly into a pension so doesn't take home double.
However, he does pay for all big ticket items (flights to the USA, new carpets, the car).
What we do with the rest of our money is up to us, atm I am paying off a bit of debt from my single parent days and also saving like mad so we can buy a house together and I have some equity from the off. He just squirrals a lot away or treats us to things- he is very generous when it comes to birthdays and family.
We have consistent communication on the balance of things and how happy we are with things- he is constantly telling me off for buy DD stuff or house stuff out of my own account instead of the joint account as he says we are both responsible not just me.
After being a single parent I am adament to maintain financial independence- it would be the same if we were married. We don't plan on having more children but if we did there would definitely be flex in how we split the bills.
after going around the houses in my response I do think both parties should have access to an amount of savings should anything happen- not just a breakdown of a relationship, perhaps death of a partner and assets frozen.