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Or also i would imagine something like zuji which shows taxes and charges seperate would give an idea of the extra costs.
You can also now use points for taxes/changes instead of cash, i think its for domestic flights only.
As Kiwi Flyer posted, go through the booking process, complete the booking, either by returning to your origin and clicking on "Book Itinerary" or clicking "Complete Booking" ehrn your routing is complete.
You will then need to enter at least on set of phone details. Then you click "Next >" and you will see the taxes under 'Charges and Tax Details'.