After 12 months, CGT is payable on 50% of the capital gain.
The CGT amount is added to your taxable income.
So if you bout a place for $200K, and sold it 11 months later for $250K, $50K (less acquisition costs) would be added to your taxable income for that tax year. But if you sold it 12 months later, only half of that amount would be added to your taxable income.
(If you've had the asset for some years, there's older rules which may be applicable, but this is not the case here).