So far this year, Revenue has paid out €637m in tax refunds to well over half-a-million taxpayers.
Average refunds are nearly €1,000 for this year, new figures show, but more money is likely to be available to more PAYE workers.
People got money back because of their employers taking too much income tax and for claims for tax reliefs like spending on GPs and prescriptions.
Those who filed a return so far this year have received an average of €964 back from Revenue, calculations by the Irish Independent show.
About 661,000 returns that were filed by ordinary income taxpayers have resulted in an overpayment.
Revenue said that meant €637m being paid into bank accounts.
There has been a huge increase in the number of income tax returns showing an overpayment since the start of this year.
An increase of close to 280,000 taxpayer returns show an overpayment.
Revenue wants more people to use its PAYE tax portal, MyAccount, to claim what they are due.
It said that already this year more than 806,000 returns have being filed using MyAccount by PAYE workers.
The returns show 96,000 income taxpayers owe money to Revenue.
Since January, the number of tax claims across a range of credits has continued to increase.
Claims for the rent-tax credit have risen by 118,140 to 216,839.
Any taxpayer who has not yet done so should review and finalise their tax position for 2022, 2023 and 2024
However, this is still well below government estimates of 400,000 people being eligible to claim it.
The rent tax credit is 20pc of rent paid up to a maximum of €1,000 a year for an individual and €2,000 a year for jointly assessed couples.
Revenue said claims for flat-rate expenses have increased by 119,604 to 202,115.
Remote working relief claims have increased by almost 40,000 to 85,247.
Health expenses have been claimed by 260,995 taxpayers, representing an increase of 132,659. People who have paid for eligible health expenses are entitled to claim relief at your standard rate of tax of 20pc.
These include day-to-day medical expenses such as GP visits and prescription fees.
Revenue’s national PAYE manager Aisling Ní Mhaoileoin said: “I encourage all PAYE taxpayers to log on to Revenue’s MyAccount service to finalise their tax position as soon as they can.”
Taxpayers have four years to claim any additional refund they may be due, she said.
Any taxpayer who has not yet done so should review and finalise their tax position for 2022, 2023 and 2024.
“If Revenue owes you money, you’ll receive a refund into your bank account within days. If you owe Revenue money, we will work with you to find a suitable payment option,” Ms Ní Mhaoileoin said.
Detailed guidance, including step-by-step videos on how to submit a PAYE Income Tax Return and information on the wide range of tax credits and reliefs available, can be found on MyAccount and on the dedicated PAYE campaign page at revenue.ie/paye
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