How can we guarantee a net pay of 50% from gross earnings under Saudi legislation?

Hi,

We have some voluntary deduction elements, like loans, in addition to statutory deductions like GOSI, which in some cases are greater than the total earnings. How can we guarantee that the employee will have a net pay of 50% from gross earnings and save the remaining negative amount in an arrears balance to be refunded in next period by employee?

Best regards,

elie