How much do people generally tip in Vietnam?

Previously, Vietnamese people did not have the habit of tipping; however, a boom in tourism allows this western life style to be adapted by the local. The most common situations to give tips are eating at restaurants, taking a taxi or hiring a tour guide. It all depends on the quality of services they provide you as well as yours’ satisfaction. To a taxi driver, 50 cents to $1is greatly appreciated, but not common. In a luxury restaurant, you can leave the change or a VND 50,000 note (about $2.5) which is really generous. In some upscale spa or hotels, a service fee of 10% is often added, so tipping is not necessary.