An increase in the carbon tax will see the price of home heating oil and other fuels rising from €56 to €63.50 per tonne today, 1st May.
Filling a 900-litre home-heating oil tank is expected to cost an additional €19.
Increases on petrol and diesel will come in October, as part of Budget 2025.
Today’s increase has been blasted as a measure that is “heaping more pressure on people in a cost-of-living crisis”.
Sinn Féin spokesperson on Finance, Pearse Doherty TD said: “The carbon tax is regressive. It hits ordinary people on middle and low incomes the hardest.
“Independents by facilitating Fianna Fáil and Fine Gael to increase taxes on people that have to heat their home or drive their car for work have turned their back on their voters.
“Independents, led by Michael Lowry, were happy to sign up for five years of carbon tax increases to get their hands on a few government jobs.
“This means throwing ordinary workers and families struggling with a cost-of-living crisis under the bus for their own personal ambition.
“People using home-heating oil will end up paying an extra €19 to fill a 900-litre home-heating oil tank.
“It doesn’t change behaviour for most people because they have no other option. All it does is penalise people that don’t have any alternative.
Deputy Doherty added: “It doesn’t make economic or environmental sense. Independents, Fianna Fáil and Fine Gael need to come to their senses and stop heaping more and more pressure on workers and families.”