More than a million taxpayers overpaid a total of €620m in tax in the past three years - and they missed out on an average tax refund of €600 each, according to the website Taxback.com.

Taxpayers could lose out on hundreds or thousands of euro in tax refunds if they don't submit a tax refund claim for 2018 before December 31, as there's a four year time limit on refund claims.

Taxback.com has called on the tens of thousands of people who have not yet submitted a tax refund claim for 2018 to do so by New Year's Eve.

Taxback.com's Marian Ryan said: "Irish people are overpaying hundreds of millions in taxes a year and so they should make it their priority to claim their refunds. Almost half a million people overpaid a total of €300m in income tax in 2021, according to figures provided in response to a Dáil question this year.

"The average tax refund which people could be missing out on for 2021 is €667. Those who wait until the New Year to make a claim for 2018 will lose out."

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With thousands now working from home, people were also urged to claim remote working tax relief, as steep energy bills mean the tax credit will be even more valuable to them.

Ms Ryan said: "Given the huge increase in heating and electricity bills, anyone who is still working from home should claim remote working relief. You can claim back 30% of the cost of electricity, heat and broadband for 2022, so this tax break could easily put hundreds of euro back into your pocket."

Tenants, or parents paying rent on behalf of a student child, can also claim the recently introduced rent tax credit.

It's worth up to €500 a year for single people and up to €1,000 a year for married couples and civil partners for the tax years 2022, 2023, 2024 and 2025.