Spousal maintanence

I''d like to know what level, or how much I will need to give my ex-wife.
We were partners in an architectural practice that lost £20K last year.
I''m 48, she''s 47.
The average income to the practice last year was £9600/month in gross fees but the outgoings higher, hence the loss at year end.
I''m still trading, but business is slow.
I''m now a limited company.
My wife is not qualified and has been a homemaker, so her capacity to earn is low, I would surmise.

Any advice on how I can get a real handle on the costs, please.
I understand child maintenance is 15% of my netted income after my living expenses as the non resident parent.

OR
Is there a spreadsheet calculator available.

Child maintenance for one child is 15% of net income less deduction for overnight stays. Percentage increases for more children. Go on to the CSA website they have a calculator to allow you work out how much you will need to pay.

I am not sure where you got the "less living expenses from" - That is not the case.

Spousal Maintenance is paid on the basis of need and affordability. If the money is not there it is unlikely SM would be payable, although a nominal sum may be relevant say £1 per month which would leave the option to apply for a variation should either of your financials situations change in the future.