Because of slippage...ask your broker to get a rate reduction for you.
I will, after my fixed period expired. I just fixed my loan for 2 years for 4.99%.
How to calculate comparison rate for my case, if I don't pay annual fee, exit fee etc (because I didn't move lender). The only fee I pay is $10 account fee for the offset account - which actually has nothing to do with the fixed rate itself.