1. Estimating rather than getting the actual figures.
2. Claiming a deduction for interest on the private portion of the loan. The interest expense must be apportioned between the ‘deductible’ and the ‘private’ portion of the total borrowings.
3. When depreciating assets, new assets acquired for less than $1,000 during the year are allocated as ‘low cost assets’ to the pool but the decline in value for these assets in the first year is at a rate of 18.75%, or half the pool rate. Halving the rate recognises that assets may be allocated to the pool throughout the income year and eliminates the need to make separate calculations for each asset based on the date it was allocated to the pool. For subsequent years they are depreciated at the normal pool rate of 37.5%.
4. Claiming initial repairs or capital improvements as immediate deductions. Initial repairs to rectify damage, defects or deterioration that existed at the time of purchasing a property is generally capital and not deductible, even if you carried out these repairs to make the property suitable for renting. However, it may be claimed as capital works deductions over 40 years.
5. Not showing dividends from dividend reinvestment plans in your tax return.
6. Claiming a deduction for the cost of travel when the main purpose of the trip is to have a holiday and the inspection of the property is incidental to that.
7. Not having receipts to justify the deductions you are claiming, and you cannot justify the connection between the expense and deriving the income (eg, it was for a private purpose).
8. Omitting overseas income – taxpayers are subject to tax on their world-wide income and the ATO has agreements with over 42 countries with data-sharing.
9. Claiming deductions for a rental property that is not genuinely available for rent, ie, a holiday house.
10. Incorrectly claiming deductions for a property that is only available for rent for part of a year.
11. Incorrectly claiming deductions for a rental property when it has been used by relatives or friends free of charge for the part of the year. A deduction is not allowable for the periods involving that free occupancy.
12. Incorrectly claiming for the cost of land in a claim for capital works. Only the original cost of construction is included in the calculation and the cost of the land forms part of the cost base when calculating a capital gain or loss.
13. Incorrectly claiming deductions on depreciating assets that are only eligible for a capital works deduction.
14. Incorrectly claiming a deduction for conveyancing costs when they should form part of the cost for capital gains tax purposes.
15. Incorrectly claiming all deductible borrowing expenses greater than $100 in the first year they are incurred instead of spreading over five years or over the term of the loan, whichever is less.
16. Not splitting the income and expenses in line with their legal interest in a property where purchased by a husband and wife as co-owners.
Source : Your Investment Property (12 July 2012)