My SO has three children by his first marriage aged 13, 12 and 3. He has joint custody of them (160 per year, so every Fri/Sat/Sun night plus bank holidays) but they are officially resident with their mother. (She is due to remarry in December.) He works in a reasonably paid job and child support is paid by CSA guidelines. (We live in the UK.)
We're looking into having a child of our own. It's fairly simple to see how the calculation changes if there is another child in the equation. However, for the other three he was the stay at home parent and primary carer - he has mentioned he would like to do this for our child. How would this affect his child support payments if his income drops, or even stops altogether and I become the main wage-earner? Would the CSA be based on his new or his old income? Would I become liable for his child maintenance even though the other three are not biologically mine? What are the tax implications - it would be my first child but his fourth, which would then affect our child tax benefits if it went in his name and not mine!
We do not currently live together and we are not married; this would likely change if we started a family of our own but I want to know what I'd be getting into and the options available, and perhaps whether we should wait to get married etc.
