My partner and I don't share finances,but we pay half of all bills. He payed more years ago when My wages were lower.
I will work out half of everything, including bus fayre and school meals for DC. I gave DC extra money to socialise with and factored this into payment. It was paid,but questioned as it was something he didn't previously agree to.
I buy the majority of DC essentials, he will buy bits as needed
I pay for the bulk of the shopping and house things need (we go together and there are 2 separate transactions)
I buy birthday/Xmas presents (he will sometimes buy his own bits and pieces to give to DC, but majority is from me
He pays for the majority of holidays with hostels/hotels etc.
He doesn't drive,so I will do all the driving to places
I will organise and pay for some trips/ experiences, generally more expensive accommodation etc.
He rarely asks me for a lift if he is going somewhere local. There is an event that he wanted to go to over the weekend. Public transport was expensive so I drove. It wasn't something I would have done without him,but had a good time.
I had an unexpected charge going to the place, so spent around £45 altogether.
I asked if it would be okay if he paid half on this occasion. He and DC were both quite shocked that I would ask, and mentioned that he pays for holidays.
When I mentioned £45, he replied 'that's a very specific amount' and that he would pay for all of it. I repeated it was only half that I asked for, but there was an atmosphere after this.
I'm not a tight person,but maybe it seems I am (if I am, I'm happy (is) to be told :)