maintenance query

My ex left me and our daughter 3 years ago to live with another woman, he paid me 15% of his net income as child maintenance (CM) until they had a baby son together, he then reduced my daughter's CM - he took 15% off of his net income before working out my daughter's 15%. He has now left that girlfriend for a new one (no new babies yet) but he wants to reduce my daughter's CM again - he said that as he has 2 children he doesn't live with, he only needs to pay 20% of his net income in total - 10% to me for my daughter and 10% to his ex-girlfriend for her son - does anyone know if that is correct - I could understand only getting 10% per child if both of the children were mine, but it doesn't seem quite right that my daughter's CM is going to be reduced again because he has left the mother of his second child too?

We don't use the CSA formally, but my ex does use the CSA formula to work out how much to pay - I have had a look at their website but their information about what would happen in this case seems a bit ambiguous to me.

Any thoughts on the matter would be much appreciated.

Thanks

Lisa

it's correct in as far as I'm able to understand how the CSA work. It doesn't feel fair, no. The law says 20% for two children so it gets split between you. Otherwise, you'd be looking at him paying out 30% (15 for each child) or you getting 15% and the other mother getting 5%.

Unfortunately it correctly follows the CSA formula.

If the mother of his son decides to use the CSA you will be forced to as well.

And if he does have another child with the third woman it'll go down again as he will be able to take 15% off for that child before calculating the 20% that you and second woman currently share leaving you only 8.5% each.