Following on from the Platinum IPO thread, i thought i'd make this seperate so as not to sidetrack it. ... i've just gone through my mail and have received 2 refund cheques. One of them is from my margin loan. I applied for $20,000 worth but got $2,000 so i now have a refund cheque of $18,000. Where do i deposit the refund cheque of $18,000? Do i: 1) deposit the cheque back into my margin loan... if so, how do i do this with commsec? Can i deposit over the counter at the local commonwealth branch? Or, 2) deposit it into my offset account? Reason i ask is because i'm guessing the interest on the $18k from the margin loan will not be tax deductable if it's deposited into my offset account which i use for both personal and investment use.