2nd Quarter 2024 Tax Deadline Uk.  — january 31 is the deadline for online tax returns to be completed. If you’re doing a paper tax return, you must submit it by midnight 31 october 2023.

 — self assessment customers have just 100 days left to submit their tax return ahead of the deadline on 31 january 2024, hm revenue and customs (hmrc) has said. Balancing payment for tax year ended 5.