I've been with DP for 4 years but this is our first long term relationship for both of us so I'm just looking for opinions and ideas about the best way to do things.
When DP and I started going out, we were both students. We moved in together after 2 years. We currently have an arrangement where I pay for the food shopping and he pays the bills. Back when we were students and didn't pay council tax (and pre-recession fuel increases), this worked out at a 50/50 split. We are in a very fortunate position in that we don't have to pay rent or mortgage payments (DP's very wealthy grandparents bought him a flat).
Now we are both working full time, though I do a standard 9-5 and DP does 9-6 with an hour or so of work from home in the evenings. DP earns twice what I do (2.5 times what I earn if he gets his bonus - we're both fine with this as we are motivated by different things). As I get home first, I do all the cooking. I've also always done most of the cleaning as DP is quite messy.
Just wondering how finances work, especially if one person earns a lot more than the other. It hasn't caused any issues yet, though DP has suggested an expensive holiday later in the year. It's not such a big deal for him, though it is quite a large amount for me. So, do people split things 50/50, or as a percentage of their income? Do you take into account domestic duties when dividing up money? Would you have a joint account if you're not married?