Travel allowances and the proper use of the exception to substantiate claims
A travel allowance is a payment made to employees to cover accommodation, food, drink or incidental expenses they incur when they travel away from their home overnight in the course of their duties.
In most circumstances, when claiming other deductions, you will be expected to be able to substantiate the expense being claimed with documentary evidence, and produce that evidence should the ATO request it.
However an exception to substantiate claims applies to travel allowance expenses if the ATO considers the total claimed to be “reasonable” (more below) and to be no more that the allowance provided. Guidelines on these amounts are updated annually.