2025 Income Tax Return filing deadline is fast approaching With the 31st of October tax filing deadline fast approaching now is the time to get your tax affairs in order. October 31st 2026 is the income tax filing deadline for taxpayers, typically the self-employed and company directors, to file their 2025 income tax return. The deadline is extended to 18th of November if you are registered with Revenue’s Online Service (ROS). Under the pay and file system operated by