I'd appreciate input on what would be a fair financial arrangement in this scenario (sorry if this type of thread has been done to death).
Person 1 and 2 live with Person 1's child from a previous relationship.
Person 1 - takes home £2k pcm including maintenance from NRP. Has personal bills of approx £1k pcm - childcare bill, car to run etc. Does not receive child benefit as Person 2's salary is above threshold.
Person 2 - takes home £3k pcm. Has very low personal expenses - e.g. Company car with fuel card, so no car expenses.
Household bills are £1500 including food.
I know some people pay into a joint bills account proportionately to allow for income discrepancy. However, for example, 40% of salary into bills account each would leave Person 1 with £200, and Person 2 with £1800 to themselves each month.
Is this fair? Equally, it's not Person 2's fault that Person 1 has a childcare bill to pay and has to run a car.
Any suggestions on what would be fair here?