After printing payroll cheques I realized one employee was paid the wrong amount, I have to generate my EFT file and send to the bank right away how do I correct this so the EFT file I generate is correct?

The first step is to reverse the incorrect payroll cheque for this employee:

Next go back and make sure the employee’s pay tab or timecard is correct. Then you can re-calculate payroll for this one employee only using the same pay period end date then process this new calculation of payroll.

Next verify your pre-cheque register and proceed to print cheques then to generate your EFT file as normal.