Originally Posted by andreadbc

Tickets that originate in Peru have sales tax (18%) on top of the fare (the redemption fee is a separate situation that was implemented in 2020) -- until this latest change, for instance for a domestic ticket you'd only pay airport fee and the rest was priced in miles, now only the equivalent fare is priced in miles and you pay in $ for the sales tax + the airport fee.

For example : pricing a sample LIM-CUZ-LIM in June (no redemption fee for domestic over 90 days from travel):
Fare $74 + sales tax 18% is $13.32 + airport fee $15.78 = $103.10)
same flights for booking with miles will say: 5860 miles + sales tax $13.32 + airport fee $15.78 "equivalent to $103.10" -- the fare portion only ($74) is being covered by the 5860 miles (1.26 cents/mile).
Before this latest change you could get an award ticket paying in miles + only the $15.78 airport fee.