Click this link for Item 2 Income on Individual tax return instructions 2018 on the ATO website.
Allowances, earnings, tips, director's fees etc. are entered at Item 1
For information on reasonable travel and overtime meal allowances search the ATO website for the Tax Determination TD 2017/19.
If the taxpayer has received such an allowance and it is not shown on the payment summary, it does not have to be included as income at this item providing all the allowance was spent on deductible expenses and you are not making a claim for expenses relating to the allowance at D2 or D5.
10-030 Convertibility into money
10-060 Allowances and Fringe Benefits
10-070 Voluntary payments or gifts