Using an applied dynamic general-equilibrium model, we simulate the environmental, economic, and budgetary effects in Portugal of a new carbon tax indexed to the carbon price in the EU-ETS market. Through careful recycling of the carbon-tax revenues to finance lower personal income taxes, lower Social Security contributions, and higher investment tax credits-in particular when these changes are directed at promoting energy efficiency-we show that a carbon tax reform can yield three dividends of a long-lasting nature: a reduction in emissions, better economic performance, and a stronger budgetary position. Thus, we show that it is possible to design a politically-feasible carbon tax reform that not only boosts economic growth and strengthens fiscal consolidation, but also accommodates the legitimate needs of different stakeholders: interest groups that target environmental goals, households focused distributional issues, and businesses concerned with international competitiveness. These views were fully incorporated in a draft bill presented to the Portuguese Government in September 2014 by the Commission for Environmental Tax Reform [CRFV (2014)]. Based on these recommendations, a new indexed carbon tax was then approved by Parliament, and enacted on January 1 st , 2015.