Carbon Tax Ireland 2026: Rates, the Postponed Increase, and What It Means for Heating Bills

Budget 2027 reversed the direction of carbon tax on home heating. On 6 October 2026 the Government cut the rate on kerosene and natural gas to €48.50 per tonne of CO2 and committed to holding it there until 2030, instead of letting it rise to €71. The increase that was due to land on 14 October 2026 is gone. Petrol and diesel are a separate story: their step up to €78.50 per tonne was deferred to 1 May 2027, and from 13 October 2027 they go back on the Finance Act 2020 path toward €100 per tonne. Coal and briquettes were deferred too, but only as far as 1 May 2027, when they take a double step to €78.50. So the single trajectory this page described for most of 2026 has split three ways, and if you heat with oil or gas you are now the one group facing a cut rather than a rise.

What the Carbon Tax Is and What It Covers

Carbon tax is an excise charged on fossil fuels in proportion to the CO2 they emit when burned. It applies to petrol and diesel through the carbon component of Mineral Oil Tax, to natural gas through the Natural Gas Carbon Tax, and to coal and peat through the Solid Fuel Carbon Tax. The supplier pays it and passes it on in the price, so you never see a separate carbon tax line at the pump or on an oil delivery docket. VAT is then charged on top.

The increases are deliberately staggered. When the Budget raises the rate each October, petrol and diesel move immediately, but heating fuels normally wait until 1 May so the higher rate does not land in the middle of the heating season. That lag is why two rates are usually in force at once. After Budget 2027 there are effectively three, because kerosene and gas were pulled off the escalator altogether.

What Budget 2027 Did: a Cut, Not a Postponement

The story up to Budget day went like this. Budget 2026, delivered on 7 October 2025, raised the carbon tax by €7.50 to €71 per tonne. Petrol and diesel went up the next day, heating fuels were scheduled to follow on 1 May 2026, then oil prices spiked in early 2026, fuel price protests spread, and the Government cut fuel excise temporarily in March and April and pushed the heating fuel increase back to 14 October 2026, the day of Budget 2027.

Budget day came and the increase was not merely pushed again. The Minister for Finance announced that carbon tax on kerosene and natural gas is being reduced to €48.50 per tonne of CO2, and that the rates "will be maintained for the lifetime of the government". He added that the decision not to proceed with future increases on those products "will ultimately result in the carbon tax rate being less than half of what was set out originally". For home heating oil and gas, the escalator is off.

Two things to be clear about. First, this is a reduction rather than a freeze, so the carbon charge in a tank of oil actually falls below what you have been paying. Second, it does not apply to everything that burns. Petrol, diesel and solid fuels are still on the legislated path to €100 per tonne; only kerosene and natural gas were taken off it. Revenue has not yet republished its rate manual and the commencement date sits with Finance Bill 2026, so check the bill before planning around an exact date. Our page on Budget 2027's energy measures has the full list.

Kerosene and natural gas rates per Budget 2027 Tax Policy Changes, chapter 5.1, Department of Finance, 6 October 2026. Solid fuel rates are the Finance Act 2020 path as set out in Revenue's Excise Duty Rates on Energy Products manual (updated April 2026), with the Budget 2027 deferral applied. Petrol and diesel move each October, one step ahead: they have been at €71 since 8 October 2025 and the step to €78.50 is deferred from 14 October 2026 to 1 May 2027. Revenue's manual has not yet been republished for the new kerosene and gas rate.

What Carbon Tax Adds to Real Bills Now

Per tonne of CO2 is an abstract unit, so here is what the tax looks like on the fuels Irish homes actually buy, using Revenue's published rates.

Home heating oil (kerosene). The carbon charge on kerosene was €160.81 per 1,000 litres at the €63.50 rate, which is about €145 on a typical 900-litre fill, before VAT. At the new €48.50 rate the charge works out at roughly €123 per 1,000 litres, or about €111 a fill. That is a saving of around €34 a fill against what you have been paying, and about €51 against the €162 you would have paid had the October increase gone ahead. Because the rate is to be held until 2030, the €228 a fill that the old path led to in 2030 no longer applies to kerosene.

Natural gas. The Natural Gas Carbon Tax was €11.48 per megawatt-hour at the €63.50 rate. At €48.50 it comes to roughly €8.77 per megawatt-hour. For a typical gas-heated home using around 11,000 kWh a year, that moves the carbon tax from about €126 a year to about €96, before VAT, and it is meant to stay there to 2030 rather than climbing to the €199 the old path implied.

Coal and briquettes. Solid Fuel Carbon Tax is still €167.24 per tonne of coal and €116.43 per tonne of peat briquettes. These were not cut. The 14 October 2026 increase is deferred, and on 1 May 2027 they take a double step to the €78.50 basis, which works out at roughly €207 per tonne of coal and €144 per tonne of briquettes.

Petrol and diesel. The carbon component sits at the €71 basis: €164.30 per 1,000 litres of petrol (about 16.4c a litre) and €190.04 for auto-diesel (about 19c a litre), before VAT. The step to €78.50 that was due on 14 October 2026 is deferred to 1 May 2027, which pushes those to roughly 18.2c and 21c a litre when it lands. Separately, the temporary excise cuts on petrol and diesel were extended in full to 28 February 2027 and are then restored in four phases, finishing on 30 June 2027.

Where the Money Goes

Carbon tax is unusual in the Irish system because the receipts are ring-fenced by law rather than disappearing into general spending. Around €1.1 billion in 2026 is earmarked for three things: social protection measures that offset the cost for lower-income households (such as fuel allowance), a national retrofitting programme weighted toward energy poverty, and supports for greener farming. Budget 2026 put the extra yield from the €71 step at €121 million for 2026 and €157 million in a full year.

The retrofit link is direct. The fully funded Warmer Homes Scheme, which upgrades the homes of people on qualifying payments at no cost, has seen its allocation grow elevenfold since 2020 on the back of carbon tax revenue. So the tax that makes oil and coal dearer is the same money paying for insulation, heat pump grants and free energy upgrades.

The Solar Angle: A Legislated Rise You Can Opt Out Of

Most energy price movements are guesses. Wholesale electricity and gas prices swing with weather and geopolitics, and supplier price changes arrive with a few weeks' notice. Carbon tax is different: the increases are written into legislation years ahead. If you heat with oil or gas, you can read the table above and know that the tax portion of your heating bill is scheduled to rise by more than half between now and 2030, before anything happens to the underlying fuel price.

Here is the part that matters for this site. There is no carbon tax line on your electricity bill. Household electricity is exempt from Ireland's Electricity Tax, and the carbon cost of fossil generation is priced at power-station level through the EU emissions trading system rather than as a levy on your bill. A home that runs on electricity, generates a share of it from its own roof, and heats with a heat pump instead of an oil boiler has stepped off the carbon tax trajectory almost entirely. The 140,000-plus Irish households that already have solar PV installed cut the bought-in portion of that electricity further, and any surplus earns export credit under the Clean Export Guarantee, with the first €400 a year tax-free until at least the end of 2028.

None of this means solar removes carbon tax from your petrol car, and a solar array on its own does not change what your gas boiler burns. The honest framing is this: carbon tax is a modest but steadily rising charge on fossil heating, it is the most predictable energy cost increase in the country, and every kilowatt-hour you generate and every litre of kerosene you no longer burn is a step out of its way. Paired with rising unit rates, it is one more reason the payback maths on solar in 2026 keeps tilting in the homeowner's favour.

Run the Numbers for Your Own House

If your heating oil fill is carrying €145 of carbon tax today and €162 from October, it is worth knowing what the alternative looks like. We match homeowners with SEAI-registered installers in your county who size a system to your roof and usage, handle the SEAI grant and grid paperwork, and quote for free. No obligation, and we do not install panels ourselves, so the advice is not a sales pitch.

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