Level 1

I have a non-resident from Korean(student)and the programme remove the basic personal amount on line 30000 but not from line 58040 on form ON428 why? now my customer got a letter the CRA that she owes

I have a non-resident from Korean(student)and the programme remove the basic personal amount on line 30000 but not from line 58040 on form ON428 why? now my customer got a letter the CRA that she owes