Finances in a step family one parent has child and the other doesn't

[freehugs6]

Hi all

I'm looking for some advice on finances. Here is the situation:

• I have no children
• He has a daughter age 10
• I earn c£50k
• He earns over £100k
• He still owns house with ex (currently on market) and himself is in rented (he pays both mortgage and rent currently)
• I have a mortgaged house (alone)

How would you envisage a fair split of finances should he move in with me and his daughter stay with us regularly (i.e. every other weekend and 1-2 nights a week).

Appreciate there are wider implications around him having a potential claim against the property if he contributes to it and so would look to draw up a cohabitation agreement.

With only one child, you'd likely be looking at a house big enough to accommodate her anyway, so I'd probably just go 50/50 on the house and he pays for all expenses related to his DD.

If he moves into your home I’d would half the mortgage and bills; you could ask for more for water and electricity because of his daughter but I can’t see how you’d work out a fair split and you’ll already be better off with him contributing to all this. I’d expect you to pay for house improvements but he pays for what might be needed in the room his DD has at your house.
He should pay slightly more for food so you aren’t subsiding his DDS food which might not seem much at this age but when she’s a teen you’ll be paying for an extra adult essentially.
He’ll still be better off than you because he earns so much more but at this stage I think that’s normal. Mainly you shouldn’t be out of pocket in my view.

My DP has three kids, so we rented together before buying to see how it would work out. I was childless so living together meant my expenses would shoot up, as we needed a place big enough for all of his kids. We split it 60/40 initially.

We’re a few years down the line now and have bought a house together 50/50. He’ll still chip in extra for food costs as the youngest on the rare occasion they’ll stay are fussy eaters and have to have separate meals

Do you need/want to live together in your house? Keeping separate houses is always an option.

He pays 60%
You pay 40%

Similar salary ratios here, and I have DC, so he pays a third and I pay two thirds.

I would probably say that you would of needed and rented/bought a bigger property than a one bedroom. I would say 50/50 on mortgage and bills and he chips in extra for food on the days she's there. Ultimately it's not going to cost much extra in bills her being there occasionally.

Thank you. Just to clarify I own a three bedroom house so there is space for her to have her own room.