Issue 1.
Does anyone know when the limit was last increased?
I don't know anyone who only spends 15% of their income on their children, but someone earning over 2000 per week can certainly afford to continue to pay 15% of any income over and above this.
Why should their children have a lower standard of living than they themselves enjoy? Infact, why should their children have a lower standard of living than the average household? According to the Office for National Statistics, the average household income in 2008/9 was around 25,000 (after tax)
Issue 2.
Self-employed individuals can run rings around the CSA's employees. The CSA acts on partial information before they have made any effort to ascertain the whole truth. So if an absent parent resigns as director of their own company because they have sold it for a small fortune, they can cause havoc to the parent-with-care's budget by sending the CSA their P45.
It can take the CSA six months to inform the parent-with-care by which point an apparent 'overpayment' has already been incurred before the parent-with-care has had a chance to challenge the reasons for the change in their income! And then the parent-with-care's income is reduce even further while the apparent 'overpayment' is paid back!
Issue 3.
The courts do not have the jurisdiction to award a top-up payment until the limit is reached. Judges and lawyers do not seem to have a clue how the CSA makes their calculations and how easy it is for the absent parent to avoid their liabilities.
The CSA does not have the expertise to investigate complex financial arrangements.