Tipping in a foreign land is always a conundrum. While it is not necessary in Japan or Korea, the custom is slowly taking hold in China in international standard hotels frequent by foreigners Tipping in Hong Kong is a complex problem because you only tip certain services While it is not customary to tip taxi drivers, they may take the liberty of rounding up the fare to the nearest dollar figure. Some, how ever, will round the figure down. wards and make you pay a few cents less than the actual fare.