2020-21 UK Tax Deadline Monday, 31 January 2022 12:00 am 11:59 pm 00:00 23:59 ProACT Partnership Expatriate Advice 59-60 Thames Street Windsor, England, SL4 1TX United Kingdom (map) Google Calendar ICS Submit your 2020-21 UK tax return and pay tax online by 31st January 2022.Read more about if you are required to submit a tax return & how we can helpIf you need help submitting your return, book a free review.