Tipping isn't mandatory or customary in Vietnam, but a tip of spare change or another small amount would be appreciated by restaurants, drivers and other service workers, especially if the service has been particularly good.
If you're happy with the services provided a tip - though not compulsory - is appropriate. While it may not be customary to you, it's of great significance to the people who will take care of you during your travels, inspires excellent service, and is an entrenched feature of the tourism industry across many Intrepid destinations. Carrying small notes of local currency will make tipping easier. It is best to avoid tipping with coins, very small denomination notes, or dirty and ripped notes, as this can be regarded as an insult.
What is a tipping kitty?
On Day 1 your Vietnam tour leader may discuss with you the idea of running a group tipping kitty, whereby everybody contributes an equal amount and then your tour leader pays the tips for drivers, local guides, and hotel staff (excludes restaurant tips). The leader will keep a running record of all monies spent which can be checked at any time, and any money remaining at the end of the tour returned to group members. This is often the easiest way to avoid the hassles of needing small change and knowing when and what is an appropriate amount to tip. Participation in this kitty at your own discretion, and you are welcome to manage your own tipping separately if you prefer. Please note the tipping kitty excludes tips for your tour leader.
Tipping your Tour Leader in Vietnam
You may also consider tipping your tour leader for outstanding service throughout your trip. The amount is entirely a personal preference, however as a guideline US$2-US$4 per person, per day can be used. Of course, you are free to tip more or less as you see fit, depending on your perception of service quality and the length of your trip. Remember, a tip is not compulsory and should only be given when you receive excellent service.