Gross income £12000 tax free allowance £6475 what is taxable amount @20%, tax payable, net income and weekly net amount how to work out?

We calculate for the taxable income by subtracting the tax free allowance from the gross income.

          Taxable income = Gross income - tax free allowanc
           Taxable income = (£12,000 - £6,475)
                                    = £5,525

Hence, the taxable income is equal to £5,525.

Net income: 
This would be equal to the gross income minus the amount of taxes to be paid.
 
                 Net income = Gross income - amount of tax to be paid
                 Net income = (£12,000) - (0.20)($5,525)
                 Net income = $10,895

Therefore,
         ANSWER: $10,895