An Roinn Caiteachais Phoiblí agus Athchóirithe Department of Public Expenditure and Reform The Use of Carbon Tax Funds 2022 As per Sections 27, 28 & 29 of the Finance Act 2020¹, the carbon tax will increase by €7.50 a tonne. The increase on transport fuels is effective from October 13th 2021, while the increase on home heating fuels will not take place until 1 May 2022, after the winter heating season.