{"id":2921,"date":"2021-03-23T13:09:53","date_gmt":"2021-03-23T13:09:53","guid":{"rendered":"https:\/\/whiz-consulting.com\/uk\/blog\/important-taxation-deadlines-for-business-owners-in-united-kingdom-uk\/"},"modified":"2026-07-04T10:42:41","modified_gmt":"2026-07-04T10:42:41","slug":"uk-tax-deadlines-business-owners-2026","status":"publish","type":"post","link":"https:\/\/www.whizconsulting.net\/uk\/blog\/uk-tax-deadlines-business-owners-2026\/","title":{"rendered":"UK Tax Deadlines Every Business Owner Must Know in 2026"},"content":{"rendered":"

UK tax deadlines are crucial for business owners to meet in 2026 to stay compliant and avoid penalties. Understanding when to file, report, and pay taxes ensures smooth operations and protects your business from costly errors.<\/p>\n

This guide breaks down all essential UK tax deadlines for businesses, including corporation tax, VAT, PAYE, and self-assessment obligations. By following these dates, you can plan effectively, organise your accounts, and leverage professional support to remain fully compliant while optimising cash flow and operational efficiency throughout the financial year.<\/p>\n\t

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Stay compliant, avoid penalties in 2026<\/h3>\r\n

Late VAT. Missed PAYE. HMRC fines.<\/p>\r\n\t\t<\/div>\r\n

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Important Tax Deadline<\/h2>\n

UK business owners must stay on top of key tax deadlines to remain compliant and avoid penalties. Knowing when to file, pay, and report taxes such as Corporation Tax, Self-Assessment, and CT61 ensures timely submissions and smooth financial management throughout the year.<\/p>\n

Below is a comprehensive list of the most important UK tax deadline for 2026, covering financial year starts, Corporation Tax payments, CT61 deadlines, and Self-Assessment filings. Tracking these dates helps businesses plan cash flow, organise records, and leverage professional accounting support to meet obligations efficiently.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Particulars<\/th>\nDate<\/th>\n<\/tr>\n<\/thead>\n
Financial Year Starts<\/td>\n1st April<\/td>\n<\/tr>\n
Payment of Corporation Tax for companies with a 30th June year-end<\/td>\n1st April<\/td>\n<\/tr>\n
Tax year starts<\/td>\n6th April<\/td>\n<\/tr>\n
Return and payment of CT61 tax due by companies paying interest, royalties, etc. for a quarter to 31st March<\/td>\n14th April<\/td>\n<\/tr>\n
Payment of Corporation Tax for companies with a 31st July year-end<\/td>\n1st May<\/td>\n<\/tr>\n
Payment of Corporation Tax for companies with a 31st August year-end<\/td>\n1st June<\/td>\n<\/tr>\n
Due date for Corporation Tax quarterly instalment for \u2018very large\u2019 companies with year-end 31st March<\/td>\n14th June<\/td>\n<\/tr>\n
CT61 quarterly period ends<\/td>\n30th June<\/td>\n<\/tr>\n
Payment of Corporation Tax for companies with a 30th September year-end<\/td>\n1st July<\/td>\n<\/tr>\n
Income tax due date for the CT61 period to 30th June<\/td>\n14th July<\/td>\n<\/tr>\n
Second payment on account for tax year ended previous 5th April<\/td>\n31st July<\/td>\n<\/tr>\n
Payment of Corporation Tax for companies with a 31st October year-end<\/td>\n1st August<\/td>\n<\/tr>\n
Payment of Corporation Tax for companies with a 30th November year-end<\/td>\n1st September<\/td>\n<\/tr>\n
Due date for Corporation Tax quarterly instalment for \u2018very large\u2019 companies with year-end 31st March<\/td>\n14th September<\/td>\n<\/tr>\n
CT61 quarterly period ends<\/td>\n30th September<\/td>\n<\/tr>\n
Payment of Corporation Tax for companies with a 31st December year-end<\/td>\n1st October<\/td>\n<\/tr>\n
Register for Self-Assessment if self-employed, a sole trader, not self-employed, or registering a partner\/partnership<\/td>\n5th October<\/td>\n<\/tr>\n
Income tax due date for the CT61 period to 30th September<\/td>\n14th October<\/td>\n<\/tr>\n
Deadline for postal submission of Self-Assessment tax returns (tax year ended 5th April) to be received by HMRC<\/td>\n31st October<\/td>\n<\/tr>\n
Payment of Corporation Tax for companies with a 31st January year-end<\/td>\n1st November<\/td>\n<\/tr>\n
Payment of Corporation Tax for companies with a 28th\/29th February year-end<\/td>\n1st December<\/td>\n<\/tr>\n
Due date for Corporation Tax quarterly instalment with year-end 31st March<\/td>\n14th December<\/td>\n<\/tr>\n
Deadline for online submission of Self-Assessment tax returns (tax year ended 5th April)<\/td>\n30th December<\/td>\n<\/tr>\n
Deadline for filing Self-Assessment Tax Return with HMRC to pay tax via PAYE code<\/td>\n31st December<\/td>\n<\/tr>\n
Due date to file company accounts with Companies House for limited companies (31st March year-end)<\/td>\n31st December<\/td>\n<\/tr>\n
Due date to file Corporation Tax for companies (31st December year-end)<\/td>\n31st December<\/td>\n<\/tr>\n
Payment of Corporation Tax for companies with a 31st March year-end<\/td>\n1st January<\/td>\n<\/tr>\n
Income tax due date for the CT61 period to 31st December<\/td>\n14th January<\/td>\n<\/tr>\n
Balancing payment for the previous tax year ending 5th April<\/td>\n31st January<\/td>\n<\/tr>\n
Deadline for Self-Assessment Tax Returns for tax year ended 5th April<\/td>\n31st January<\/td>\n<\/tr>\n
Tax due on gains made in the previous financial year<\/td>\n31st January<\/td>\n<\/tr>\n
Payment of Corporation Tax for companies with a 30th April year-end<\/td>\n1st February<\/td>\n<\/tr>\n
Payment of Corporation Tax for companies with a 31st May year-end<\/td>\n1st March<\/td>\n<\/tr>\n
Due date for Corporation Tax quarterly instalment with year-end 31st December<\/td>\n14th March<\/td>\n<\/tr>\n
Corporation tax returns filed by companies (31st March year-end)<\/td>\n31st March<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

When Do You Need to File and Pay VAT in the UK?<\/h2>\n

UK VAT returns are due one month and seven days after the end of your VAT accounting period. Both your online VAT return submission (under Making Tax Digital<\/strong><\/a>) and your VAT payment to HMRC must be completed by the same date.<\/p>\n

HMRC assigns VAT-registered businesses to one of three quarterly “stagger groups,” so your exact deadline depends on which cycle your business falls into:<\/p>\n