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Home office expense claims are subject to the same general substantiation requirements as other deductions – that is, it is a requirement that records should be kept for at least five years.
But in practice, full compliance with the substantiation rules may be difficult. It may be simple to keep a receipt for a printer purchased for a home business, but not so easy to prove the deductible proportion of a specific utilities bill. So the ATO has provided some administrative guidelines to ease this burden.
Proving business use proportion
The ATO will generally accept these three methods of calculating the business use proportion for a particular expense (in order of preference):
More about the four-week representative records
Claims exceeding $50
The ATO requires a taxpayer to keep records for a four-week representative period in each income year in order to claim a deduction of more than $50. The taxpayer can choose to keep records for longer than four weeks or to base their deduction on itemised bills (see above) for the entire year for a more accurate deduction.
The four-week record is merely the minimum amount of record-keeping that the ATO will accept. It is not a legal requirement to produce a time-limited representative record like the 12 week log book for car expense deductions. Remember to adjust the deduction for periods of leave taken.
According to an ATO fact sheet, the ATO will look favourably upon evidence that the employer expects the taxpayer to work at home or make work-related calls. But be aware that employer expectation is not a legal requirement. Under legislation and taking into account common law covering work-related expenses, it is enough that the expenditure is incurred in the course of producing assessable income and is not private, domestic or capital in nature.
Claims of $50 or less
Claims of $50 or less are not generally subject to substantiation checks by the ATO (although it is not explicitly stated). This however only affects the substantiation of the amount, and does not change the fact that the amount still has to be deductible under law.
Therefore it would be prudent for the taxpayer to be able to show that they had a reasonable basis for making the claim (for example, to keep evidence that some work was done at home during the year).
According to the ATO, an invoice in the name of one person is acceptable as evidence of incurred expenditure for more than one person. This may be relevant where spouses or rental accommodation housemates each do home-based work, using shared utilities.
If you need any assistance with substantiation, contact this office.
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