From: 1 July 2012
Small business enterprises (SBE) are eligible to write-off the first $5,000 of any motor vehicle purchased after 1 July 2012. This measure replaces the Entrepreneur Tax Offset. The remainder of the purchase price can be transferred into the general small business depreciation pool, which is depreciated at 15% in the first year and 30% in later years.
However if the total cost of an eligible vehicle is less than $6,500 then the whole amount is written off under the general asset provisions.
Refer to the link below for more details.