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I am afraid that under the newest rules you will have to pay 16% of 89% of gross income by way of maintenance divided equally between the two mothers.
The reduction in the deduction from 15% to 11% reflects the fact that the payment is of gross not net income.
There is no way of reducing this as the belief that lies underneath it is that you should be partly financially responsible for your children no matter what the financial position of the other parent (or their partner)
I am sorry not to be able to give you better news, please ask if you need further details
Very roughly £550 a month to be shared between the two mothers.
So long as you make these payments you cannot be forced to pay for anything else
I think you will suffer under the newest rules I am afraid - that was the calculation base don you having a child at home
You can find the precise calculation here