How do I pay a specific after tax NET pay

Everything is taxable. This is very important as it's PAYE law. To get a fixed NET wage: First add all the extras (if there are any ) and the employee's fixed monthly salary and then pay the employee using the normal monthly payment-capture and note what the net pay is. If it's less than your desired NET payslip amount then you need to add more to the gross and then re submit the payment. It's probably best to increase or decrease the fixed salary accordingly. To start with use a rough plan of 1.37 times the net amount to work out what the rough gross wage before tax will be. Once you change the fixed salary the gross and net will also change after you re submit the payment. (use edit payments to do this and note that you may not get an exact NET amount due to the tax computations but you will be able to get the NET to within about K5.) People don't normally work backwards from net pay but this would be the best method to follow if you are wanting to pay an employee this way. It might take a few times (of editing the current payment) to get the fixed amount correct so that the net payslip is as you would like. At least for the next and subsequent months it will be pretty close for the first time you process the pay (if in the following months the extras remain the same). Note: on the edit-payments form if you click on the employee number you will be taken straight to the specific payslip in order to check the Net and then by pressing the back arrow on your browser you will return to the same place you were on the edit-payments screen.