The currency that Tahiti uses is the CFP Franc Currency.
The CFP franc is the currency used in the French overseas collectivities of French Polynesia, New Caledonia, and Wallis and Futuna.
The initials CFP originally stood for colonies françaises du Pacifique.
This was later changed to Communauté financière du Pacifique and then to its present term, Change franc Pacifique.
The US Dollar can be used in some places of Tahiti.
Although there's an exchange rate when using the US Dollar In Tahiti.