Haha, 404, I'll give your suggestion all the consideration it deserves. Seriously, if you're paying even 15% tax in HK you do need a new accountant.
OK i'll bite.... If you put your Total income in one box and your mortgage/rent amount in the other box, send it to the Inland revenue department, and get a bill for less than 15% I'd like to know how you swindle it.