Revenue has announced an extension of the 2019 Pay and File deadline until 6pm tomorrow, December 11.
Revenue said it processed almost 30,000 Form 11 returns for 2019 so far.
More than 14,000 returns have been filed via ROS so far today, it said.
The total number of 2019 income tax returns filed to date is now in excess of 500,000, it added.
Revenue said it acknowledged the on-going efforts by taxpayers and agents who are working towards a deadline of midnight tonight.
"Having regard to those efforts and the associated pressures of meeting the deadline, Revenue has announced a further extension until 6pm tomorrow," it added.