Currently, there is only a single field available to update the base hourly rate for an employee. However, there should also be a separate field to update the overtime hourly rate (similar to what other payroll software provides).
The reason a separate field is required is that some of our salaried payrolls process overtime hours in arrears (e.g., April OT hours are paid in May). In such cases, if there is a salary or hourly rate change, the overtime should be paid at the old hourly rate applicable for that particular month.
Additionally, some of our clients have exceptions in place where, for certain employees, we need to factor in their shift allowance when calculating overtime rates. A separate overtime rate field would allow us to handle these scenarios accurately and efficiently.