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How to work out tax payable with income averaging

Last updated 28 May 2015

You do not need to work out your tax payable with income averaging. We will work it out from the amount at Z item 24 on your tax return. If you want to work it out for yourself, follow these steps:

Step 1

Add your ATPI to your taxable income that is not subject to income averaging (your taxable non-professional income). The total, called your ‘other income’, is taxed at normal rates.

Step 2

Subtract your ATPI from this year’s TPI to get your above average special professional income. To work out the tax payable on this income:

  • to your ‘other income’, add one-fifth of your above average special professional income
  • work out the tax payable on this amount
  • subtract the tax payable on your ‘other income’, and
  • multiply the result by five.

Step 3

Add the tax on your ‘other income’ and the tax on your above-average special professional income. The result is your total tax payable.

For more information, phone 13 28 66.

Example: Working out tax payable with income averaging 

Kevin has a taxable income of $60,000, including assessable professional income of $45,000. He has deductions of $5,000 that reasonably relate to his assessable professional income (this amount does not include gifts) and he has no other deductions. His average TPI over the last four years was $9,000.

Kevin’s tax payable, before the Medicare levy or tax offsets are taken into account, is $7,942.00. It would have been $11,047.00 (the tax on $60,000) if income averaging had not been applied.

The following steps show you how Kevin’s tax payable has been worked out.




Assessable professional income






= (a) - (b)
= $45,000 - $5,000



Kevin transfers the amount at (c) to Z item 24 on his tax return (supplementary section) and, if he has not already included any of this amount at item 1, 2, 13, 14 or 15, he also writes it at V item 24 on his tax return (supplementary section).






one-quarter of the sum of your TPI for the preceding four years, not including this income year



 Taxable non-professional income 


amount of TAXABLE INCOME OR LOSS at $ on his tax return minus the amount shown at Z item 24 on his tax return (supplementary section)




$60,000 - $40,000



 Other income 




(d) + (e)




$9,000 + $20,000



 Tax on other income at ordinary rates 



 Above-average special professional income 


(c) - (d)




$40,000 - $9,000



 Tax on [other income plus one-fifth of above-average special professional income] 


tax on [(f) + 1/5 (h)]




tax on [$29,000 + $6,200]




Tax on $35,200



 Tax on above-average special professional income 


[(i) - (g)] x 5




[$3,230.00 - $2,052.00] x 5



 Kevin's tax payable 


(g) + (j)




$2,052.00 + $5,890.00





End of example