How is PAYG calculated?
You don't need to worry about this bit, but if you're interested, here's how PAYG is calculated using the tax scales in the PAYG Withholding category (Payroll command centre > Payroll Categories > Taxes tab > click the blue zoom arrow to open the PAYG Withholding category).
PAYG withholdings = (Weekly wage amount x a) - b
Using the values shown in the screenshot above (which isn't using the latest tax tables) for an employee that has been assigned the Tax Free Threshold tax table and a fortnightly wage of $1500.
The calculation would be as follows:
Fortnightly wage = $1500
"a" coefficient = 0.3450
"b" coefficient = 182.7504
so, ($1500 x 0.3450) - 182.7504 = $334.7496
Note that when processing a pay using this example, the PAYG amount will be rounded to $334.75, or it might be different by a few cents if you've chosen to round the net pay (Setup menu > General Payroll Information).
The tax table information is set by the ATO. So, if you have any queries, please ask the ATO (or use their Tax Withheld Calculator).