Annual HKD 720000 is HKD 60000 per month. To live comfortably, I think you need to spend around HKD 15000 to HKD 20000 on rent + charges which means that you have, say HKD 40000, left for other things. Travel, food, bills + other day to day neccessities would set you back at least another HKD 15000 to 20000 and if you want a maid another HKD 4000 per month. So, saving HKD 30000 per month in my opinion is a bit tough especially when you have taxes to think about too. I believe in HK (although I have never worked there before) they pay taxes on a yearly basis. Not sure how much your bonus will be, but assuming it covers your yearly taxes you will still have HKD 60000 net per month. You will have to be quite thrifty to be able to save HKD 30000 per month. Having said that, HKD 60000 is well above average. However, it really depends on what kind of lifestyle you choose to have so it's not an easy question to answer.