Income Tax Deadline 2025 Ireland. If you need to do a tax return, the deadline for submitting it for the irish tax year (1st january to 31st december) is midnight on 31st october 2025 if you’re submitting your return on paper. Professional services withholding tax (pswt):

If you both pay and file through ros, you can avail of an extended filing date. Claim additional tax credits, reliefs or expenses.