During your stay in Chile, you may very well take a taxi to get where you are going.
While it may be customary to tip the taxi driver in most places around the world, this is not the case in Chile. A friend of mine who was a taxista (taxi driver) in Santiago for many years explained to me why this is the case.
In Chile, most taxis are driven by the vehicle owners and so the fares that they earn are theirs to keep.
My friend contrasted this with taxis in the United States where many are owned by companies that employ the taxi drivers to drive them.
So when you take a cab in Chile, pay the fare on the meter but don’t worry about the tip.
Feel free to round up the fare to an easier peso amount to pay but don’t feel obligated to pay a gratuity on top of that.