The carbon tax trajectory is a central pillar of Ireland’s climate policy framework, providing a clear and credible long-term signal to households and industry of the need to transition away from fossil fuels and towards a low-carbon economy.
Legislation was introduced in Finance Act 2020 to provide for annual increases in carbon tax rates up to May 2030. Carbon tax rates on petrol and auto-diesel are legislated to increase at Budget time each year up to 2029 with the increase delayed until 1 May for all other fuels up to 2030.
As the Deputy is aware, in April Government deferred the 1 May 2026 increases until October 14 this year in light of increased fuel prices at that time.
Government also extended the fuel allowance season by a further four weeks in order to ease the financial burden on households. This resulted in additional payments of €152 to each of the nearly 470,000 fuel allowance recipients, who are most at risk of fuel poverty.
It meant that a typical household receiving the fuel allowance will have received €1,216 over the course of the fuel allowance season.
As of Budget 2026, the Government has allocated over €4.2 billion in carbon tax revenue for these purposes since 2020. ESRI analysis consistently shows the lower income deciles are better off as a result of the social protection measures funded by the increased carbon tax.
For petrol, the carbon tax increase, inclusive of VAT, will total to 8.1 cents per litre over the remainder of the carbon tax trajectory. This gradual increase will be 2.1 cents per litre for each of the next three years, and 1.8 cents per litre in 2029.
For auto-diesel the carbon tax increases over the remainder of the trajectory will total to 9.6 cents per litre. This gradual increase will be 2.5 cents per litre for each of the next three years and 2.1 cents per litre in 2029.
Kerosene is the most commonly used oil for home heating. Inclusive of VAT the carbon tax rate increases on heating kerosene will total to 10.7 cents per litre over the remainder of the carbon tax trajectory. The annual amounts will be 2.2 cents per litre for each of the next four years and 1.9 cents per litre in 2030.
Marked Gas Oil (MGO) is generally used in agriculture and certain other sectors but may also be used for heating. Inclusive of VAT the remaining five carbon tax rate increases on MGO will total to 11.2 cents per litre. The annual increases will be 2.3 cents per litre for each of the next four years and 2 cents per litre in 2030.
In Budget 2026, €1,114 million was allocated to climate action measures and to ensure the most vulnerable are protected from the unintended impacts of the increase. This is an additional €163 million on 2025’s allocation.
This €1,114 million expenditure included retrofitting programmes, social welfare interventions, green & sustainable farming measures, as well as funding for other measures such as investment in EV infrastructure, greenways and peatland rehabilitation.
As the Deputy will be aware, as part of the annual Budget process my Department examines current tax policy and presents budgetary options to the Tax Strategy Group (TSG). The Energy, Environmental and Vehicle Tax TSG paper examines carbon tax policy and will be published in the coming weeks.