Washington’s carbon tax, known as the Climate Commitment Act, adds an estimated 56.7 cents per gallon to the cost of gasoline. In 2025, state Democrats also raised the state gas tax to 55.4 cents per gallon – the third highest in the nation – with automatic 2% yearly hikes. During the debate on Saturday over the supplemental operating budget, House Republicans fought to include a carbon tax rebate for every registered vehicle owner in Washington state: $100 for gas vehicle drivers and $50 for hybrid drivers. Democrats shot down the amendment – denying families even partial relief.