This is the information on an annual, monthly and weekly basis.
Gross Pay £22,000.00 £1,833.33 £423.08
Tax free Allowances £8,105.00 £675.42 £155.87
Total taxable £13,895.00 £1,157.92 £267.21
Tax due £2,779.00 £231.58 £53.44
National Insurance £1,728.96 £144.08 £33.25
Total Deductions £4,507.96 £375.66 £86.69
Net Wage £17,492.04 £1,457.67 £336.39
The new gross income calculation is only being brought in for families of four or more children for now, so the gross income calculation (19%) will prevail. Olgaga is therefore correct (my mistake). £80 a week is what the CSA would make him pay, less any deductions for shared care.