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The diesel differential: differences in the tax treatment of gasoline and diesel for road use Diesel and gasoline account for around 95% of energy used for road transport in the OECD and for the largest share of revenue from taxes on energy. In 33 out of 34 OECD countries, diesel fuel is taxed at lower rates than gasoline both in terms of energy and carbon content. To assess whether this difference is warranted from an environmental perspective, this paper examines the rationales for taxing both fuels, considering the externalities (including local air pollution, carbon emissions and other social costs related to road transport) associated with the use of each fuel and the fuel efficiency advantage of diesel vehicles. The revenue, distributional and competitiveness consequences of increasing tax rates on diesel are also briefly considered and the revenue effects of the tax treatment of diesel are shown to be significant. We conclude that the externalities associated with each fuel show that the lower tax rates that currently apply to diesel fuel are not justifiable from an environmental perspective. Reduction of the diesel differential is warranted. A gradual approach to removing the differential would allow the adverse distributional and competitiveness impacts to be mitigated during the transitional phase. RÉSUMÉ Avantage fiscal en faveur du gazole : différences de traitement fiscal de l'essence et du gazole à usage routier

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JT03416505 Complete document available on OLIS in its original format This document, as well as any data and map included herein, are without prejudice to the status of or sovereignty over any territory, to the delimitation of international frontiers and boundaries and to the name of any territory, city or area. ECO/WKP(2017)29 Unclassified English-Or. English ECO/WKP(2017)29 2 OECD Working Papers should not be reported as representing the official views of the OECD or of its member countries. The opinions expressed and arguments employed are those of the author(s). Working Papers describe preliminary results or research in progress by the author(s) and are published to stimulate discussion on a broad range of issues on which the OECD works.

Energy is a critical component of modern economies. It is a central ingredient to production and an important element of consumer spending. Many forms of energyparticularly fossil fuels-also contribute to significant environmental problems, such as climate change and local air pollution.