Changing our living arrangements after 2.5 years. Currently 50/50 so no payments required. When calculating child support on the calculator is the assumption you include holiday time (which isn't already agreed). Ex is high earner and expecting an argument when it comes to discuss the contribution. We currently pay a proportion each into a joint a/c which is used for childcare, clothing, clubs etc. I assume as I will be main carer that my contribution to this will end. Can't figure out how to handle it. New arrangement will be 1 night per week and EOW, so approx 8 nights every 4 weeks. Currently it's 14 nights. Hols have not been split, I've done the majority of time. Also don't want to be accountable to him for spend on food, eating out. How do others handle this?