It is not how much you earned. It is how much you take home after tax. It is not how much cash you have. It is what your cash could buy at where you live. If you live in SF Greater Bay Area, everything cost at least 3x more than China Greater Bay Area. Why smart professionals choose HK? Unlike US, HK is not a communist city. Maximum tax rate is 17%. In US the Maximum Tax Rate (Federal, State and Sales Tax) in States like California is 37% + 14.4% + 9.25% = 60.65%。不是你賺多少錢。而是你稅後帶回家多少錢。重要的不是你手上有多少現金。而是在您居住地可以購買多少東西。如果你住在舊金山大灣區，所有東西的價格都比中國大灣區最少貴3倍。你可能是表面風光，其實是內裡空虛，空心老棺。為什麼聰明的專業人士會選擇香港? 與美國不同，香港不是共產主義城市，最高稅率為17%。在美國，好像加州的最高稅率（聯邦稅、州稅和消費稅）為 37% + 14.4% + 9.25% = 60.65%