Due to rising gas prices, taxi rates at Taiwan Taoyuan International Airport have recently increased, there's now a 50% surcharge above the meter rate (plus a NT $40, or US $1.20, highway toll if traveling to Taipei). A typical fee from Taoyuan International Airport to Taipei will set you back around NT$1,100 (US $33.00).
Only a few years ago hordes of taxi drivers aggressively approached international visitors to inquire as to whether taxi service was needed, thus one could easily obtain a set fare of NT $900 to $1000 (US $27.00 to $30.00) for a cab without metered service. Now, however, due to stricter regulation and police enforcement, independent "rogue" drivers are few and far between, and patrons must queue at taxi stands in front of both airport terminals.
For further information about Terminal I taxis call (03) 398-2832.
For further information about Terminal II taxis call (03) 398-3599.
To complain about taxi service from Taiwan Taoyuan International Airport call (03) 398-2241 or (03) 398-2177.
Happy traveling!
-Scott