When is capital gains tax return Ireland 2026 deadline?A. No later than 31 October 2026 or 18th November 2026 if using ROS extended deadline covering all CGT gains made in 2025.By Cathal Maxwell|2026-09-25T12:20:24+01:00May 23, 2025|Tax Return Deadlines FAQs|Share This Story, Choose Your Platform!FacebookXBlueskyRedditLinkedInWhatsAppTelegramTumblrPinterestXingEmail About the Author: Cathal Maxwell Cathal brings over 40 years of tax experience, advising individuals and businesses on Income Tax, Capital Taxes, Inheritance Tax, Stamp Duty, and VAT.