This paper examines oil sands royalty and tax systems that have either been proposed or implemented since the mid-1990s. Simulation models of oil sands production projects are constructed and the distribution of ex ante economic rents for various assumed crude oil price paths is calculated. The results suggest that until 2007 changes in royalties and taxes had been favorable to producers. The pattern of estimated real internal rates of return obtained through the simulations supports this conclusion. The recommendations of the provincially appointed Royalty Review Panel were anchored in the view that Alberta's oil sands industry had matured since the mid-1990s and that a distribution of ex ante rents more favorable to Albertans, as owners o...