If you run a small business and fancy taking advantage of increased depreciation rates on purchases over $1,000 — say a shiny new PC — then you need to do so before the end of December. But there's a few rules to bear in mind.
The ATO has a handy FAQ document covering the rules that apply to the tax break, which lets you claim a 50% depreciation deduction. Two key pointers are that the item must primarily be for business use, and that you can't purchase something, claim the deduction and then immediately resell it. Hit the link for the full details (and remember, as ever, to conduct a tax professional for advice specific to your situation).