Student Loan not being calculated for M SL or ME SL tax code

For M SL and ME SL tax codes the Student Loan Deduction is zero when the employees weekly pay is lower than a certain amount.

For example, for the 2011/2012 tax year the threshold is $367 per week. For a fortnightly employee this is $734 per fortnight, four-weekly $1,468 and monthly $1,590.33. If the employees gross pay for the pay period is lower than this amount then the Student Loan Deduction amount will be zero.

This threshold sometimes changes from year to year so the above figures may not apply for later years.