Picture 1; Foreign exchange. Over the last five years the price of the USD has gone up 200% in terms of Venezuelan Bolivares and over 100% in the case of the Argentine peso. The rest of Latin AMerica has remained very stable. Chile, Peru and Brazil exhibit changes of less than 10%. (Data from ). Stable FX=> stable prices and volumes of international trade. A depreciating peso means cheap (and very good) Argentinean wine for USA but expensive CAT tractors for Argentine farmers.
Since your contract is more than a year, you will be filing your tax return twice, e.g. assessment year 2014 and 2015. Your assessment year 2015 will be calculated based on the resident tax rate and the non-resident flat rate of 25% will no longer be applicable.