Keeping in line with the thread title for Taiwan, this excerpt from tripadvisor.com seems pretty accurate:
"Except for bellhops and service personnel in International Hotels, tipping in Taiwan is generally not expected.
For restaurants (especially in large hotels), if there is a tip to be taken, they will just add 10-15% to your check. But in general don’t worry about tipping when your eating out! If you are from the USA, this may take some getting used to…
It is not necessary to tip Cabbies – in fact it will confuse them. But if the balance is not too much (say, 5 yuan) and you leave it (i.e. tell them to keep the change - “bu yong dzao” ) It is appreciated."
From personal experience: restarurants - as a rule, no tips; they certainly don’t expect, might not appreciate, will will likely misinterpret any added tip. An exception: Western style restaurants such as Carnegie’s, where they explicitly state “no added service charge” on the bill (meaning a tip is warranted).
Bars and clubs- Not necessary or expected. Sometimes they will have a fishbowl tip jar on the bar, which is often empty. If the bar is particularly busy, I will throw in something after the first round so I can hope to get served quicker the next time, although that’s just me.
Delivery, including pizza: no tips. Taking tips will likely get them fired; it will confuse them and you can expect a polite “no” or an awkward stalemete
Don’t feel guilty about not tipping; it’s just a different [non] tipping culture in Taiwan, much like Australia and Japan. To go counter to this culture, no matter how well intentioned, can be considered inappropriate, confusing, and even rude.