ATMs are widely available (except in villages), while credit cards are accepted at most midrange and top-end hotels and at top-end restaurants.
Tipping is not customary in restaurants or taxis (but is still appreciated).
Hotels It is usual to tip the porter at better hotels (NT$100 is considered courteous).
Tour guides A 10% addition to the fee if you are happy with the service is common.
Restaurants & bars The 10% to 15% service charge added to bills at many establishments is not a tip that is shared with the staff.