I'm not sure. We are committing to something based on the current rules and regulations. They can't simply change the rule and say no you shouldn't have done that.Plus I think even if we get in on the 30% rebate now, the tax man is going to catch you out when you lodge your 12/13 tax anyhow.... because it is all assessed in your tax anyhow on what rebate level you should of been claiming for that 12 month period, so if you claim your 30% rebate now, and they say no you earnt X amount so therefore your on tier 1/2/3 there for you owe us money as you should of had 20% 10% or no rebate.
Remember many terrorists escaped simply because there were certain laws in place when they committed their crime. May be it is not a good analogy