I didn't know that- I did the CSA calculator, which on my then salary was about 10% of my salary- as I say I signed my equity in the house over for 1% which was (I was informed then) the binding rate.
That being said I've done all the running around in five and a half years- my ex has her live in partner and new child- and he has property and a successful business.
My ex did well enough out of the settlement- there is no withholding of money by me when the kids holiday with me- I buy them clothes for when they are with me abd they go home in most of them.
There is no proper CSA assessment in place. My colleague went through the process and (as a rule of thumb) said you roughly take your salary after tax, take 20% for two kids- less 25% as they live with my ex and her new partner, less 7% per child per night of the week I have them and weekends.
This came out to me being about on the money for the settlement he has with his two kids.
There is a calculator on the CSA website and I went through that too- which put it at that figure.