Ireland has one of the highest carbon taxes in the world — and it is scheduled to keep rising. If you use natural gas, home heating oil, or other fossil fuels, the carbon tax is a significant and growing component of your energy bill. Understanding it helps you plan for future increases and make better decisions about switching tariffs and fuels.
What Is Carbon Tax?
Ireland's carbon tax is a charge applied to fossil fuels in proportion to their CO₂ emissions when burned. It is not a separate bill — it is embedded in the wholesale price of natural gas, home heating oil, peat, and coal. When those prices are passed through to consumers, the carbon tax is already included.
The tax is administered by the Revenue Commissioners and is charged per tonne of CO₂ equivalent emitted. It applies to:
- Natural gas — used for domestic heating and cooking
- Home heating oil (kerosene)
- Coal and peat
- LPG and other petroleum gases
- Transport fuels (petrol, diesel)
Carbon tax does not apply to electricity directly. You do not pay carbon tax on your electricity bill as a line item, though electricity generation from gas plants does incur carbon tax which influences the wholesale electricity price. The main direct impact on household bills is through gas and oil.
The Carbon Tax Schedule
The Irish carbon tax has a legislated schedule of annual increases, set out in the Finance Acts. The trajectory:
| Year | Carbon tax rate | |------|----------------| | 2024 | €56/tonne CO₂ | | 2025 | €63.50/tonne CO₂ | | 2026 | €71/tonne CO₂ | | 2027 | €78.50/tonne CO₂ | | 2028 | €86/tonne CO₂ | | 2029 | €93.50/tonne CO₂ | | 2030 | €100/tonne CO₂ |
The increases are announced in each year's Budget (typically October) and take effect from May 1st for home heating fuels. Transport fuels increase from Budget night.
How Much Carbon Tax Are You Actually Paying?
Natural Gas
Natural gas emits approximately 204 kg of CO₂ per MWh (0.204 tonnes/MWh). At the 2026 rate of €71/tonne, this is:
- €14.48 in carbon tax per MWh of gas consumed
- In cent per kWh: approximately 1.45c/kWh
An average Irish household using 11,000 kWh of gas per year is paying approximately €159 in carbon tax on their gas bill in 2026.
By 2030 at €100/tonne, the same household will pay approximately €224/year in carbon tax on their gas — an increase of €65/year from 2026 levels.
Home Heating Oil (Kerosene)
Kerosene emits more CO₂ per unit of energy than natural gas — approximately 258 kg CO₂ per MWh. At €71/tonne in 2026:
- €18.32 in carbon tax per MWh
- A household using 18,000 kWh/year of oil (typical for rural detached home): approximately €330 in carbon tax per year in 2026
- By 2030: approximately €464/year
Home heating oil users face a more significant carbon tax burden than gas users, and a stronger financial case for the SEAI grant-supported switch to a heat pump.
Carbon Tax and the PSO Levy: Two Separate Charges
It is worth understanding that your electricity bill includes a different levy — the PSO (Public Service Obligation) levy — which is not the same as carbon tax.
The PSO levy funds:
- Renewable electricity generation subsidies (REFIT/RESS schemes)
- Peat-fired power station decommissioning
- Maintenance of generation capacity reserve
The PSO levy for 2025–2026 is approximately €5.38 per month for a residential customer (varying by consumption band). It is visible as a separate line on most electricity bills.
What Carbon Tax Increases Mean for Energy Switching
Every €7.50/tonne increase in the carbon tax adds approximately 1.5c/kWh to home heating gas costs and 1.9c/kWh to oil costs. These increases are scheduled regardless of global energy market conditions.
This has two implications for energy decisions:
1. The gap between gas/oil and electricity heating is narrowing As carbon tax increases, the cost per unit of heat from a gas boiler rises, while the cost per unit of heat from a heat pump (powered by electricity) does not carry direct carbon tax. Combined with improving heat pump efficiencies, the economics of heat pump conversion improve with every annual increase.
2. Switching gas supplier remains important Carbon tax is embedded in the wholesale gas price your supplier passes through — you cannot avoid it by changing supplier. But the commercial margin and discount your supplier applies sits on top of the carbon-tax-inclusive wholesale cost. Switching to the cheapest gas tariff reduces the discretionary portion of your bill even if it cannot reduce the carbon tax component.
Compare Irish gas tariffs to minimise the portion you can control →
Revenue Recycling: What Happens to the Tax Revenue
The Irish government committed to using carbon tax revenues to fund:
- Just Transition payments for workers and communities in peat regions
- Targeted social protection for lower-income households (energy poverty payments)
- SEAI retrofit grants — the Home Energy Upgrade Scheme is substantially funded by carbon tax revenues
- Cycling and active travel infrastructure
In practice, how the revenue is spent is a Budget-by-Budget political decision. The Warmer Homes Scheme and SEAI retrofit grants represent the most direct recycling back to households in the form of bill-reducing upgrades.
Actions That Reduce Your Carbon Tax Exposure
In order of impact:
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Switch to a heat pump — eliminates direct carbon tax on home heating. Requires upfront investment; SEAI grants available. Best suited to well-insulated homes.
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Retrofit insulation — reduces how much gas or oil you burn, so reduces the total carbon tax paid even without changing fuel.
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Switch gas supplier — doesn't reduce carbon tax, but reduces the commercial margin and tariff premium you pay on top of it. Compare gas tariffs →
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Use energy more efficiently — dishwasher, hot water, and heating habits that reduce overall consumption reduce the carbon tax amount proportionally.
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Long-term: electrify everything — cooking, water heating, space heating. Electrification removes direct exposure to fossil fuel carbon tax, though electricity prices include a partial carbon signal through the generation mix.
Summary
- Carbon tax is embedded in gas and oil prices — you cannot avoid it by switching supplier, only by switching fuel
- 2026 rate: €71/tonne, rising to €100/tonne by 2030
- Average gas household pays ~€159/year in carbon tax (2026), rising to ~€224 by 2030
- Oil households pay more per unit and have a stronger financial case for heat pump conversion
- SEAI retrofit grants, partly funded by carbon tax revenues, reduce the upfront cost of switching away from fossil fuel heating
- Switching gas supplier remains the fastest way to reduce your controllable bill component