The other night I had a few beers and thought I'd apply for some shares in the Medibank IPO. So I logged into CBA and paid for the shares by Bpay from my offset account instead of a LOC. Can I repay my offset account from my LOC without muddying things? The amount is $30k and the LOC is with NAB if it makes any difference. It was only a few days ago so the interest component wouldn't be great.