Yes, it is only a delay, you have to pay it the next time you remit your quarterly PAYG, so don't go and spend it. I am not quite sure why they thought this would be a good idea, Rudd ever referred to it as a rebate back in December before he was corrected and reminded it was a deferral only. Deferring tax will tempt some to cry poor when they do have to finally pay it.... and tax revenues may drop accordingly ? if business income has been affected that badly, you have always been able to self adjust the friggin' thing anyway, so what the hell...as I bet we will have to pay it sooner or later anyway.
I have always manually calculated based on a quarterly P&L and always end up with a reasonable rebate at the end of the year because the deprecation is not accounted for until the end of the year.