Running a business is not easy. It involves so many responsibilities and obligations that sometimes make business owners forget about crucial tax dates and deadlines. Missed deadlines result in heavy fines and disbalance of budgets.
To help you stay informed, we have created a tax calendar for the UK that contains important dates in the tax year 2025/26. The UK’s tax year for 2025/26 started on 6th April 2025 and will end on 5th April 2026. So, let’s explore which are crucial dates you should keep in mind.
Key Dates in the Tax Calendar for the UK Tax Year 2025/26
Note it down in your diary or mark it in your smartphone’s calendar. These are some of the important dates of the tax year in the UK.
6th April 2025: Beginning of the current tax year
The UK’s tax year starts on 6th April every year. This is the day when companies start new financial records. From this day onwards, you will begin recording all income, expenses, and tax-related activities, which will run until 5th April 2026.
19th April 2025: Final PAYE Submission for 2024/25
If you are an employer using PAYE (Pay As You Earn), 19th April is the deadline to submit your final payroll report.
30th April 2025: Self-Assessment Penalty Date
If you were required to file a self-assessment tax return for the 2023/24 tax year and missed the 31st January 2025 online tax filing deadline, this is the date when additional penalties start to apply.
31st July 2025: Second Payment on Amount Due
If you are self-employed or pay taxes via self-assessment, you usually make two payments on account. This is the deadline for your second payment towards your 2024/25 tax bill.
5th October 2025: Register for Self-Assessment
If you are newly self-employed or had earned income that was not taxed during the 2024/25 tax year, this is the final day you should register with HMRC. This is also the first major deadline to get your tax return information sorted for the current tax year.
31st October 2025: Paper Tax Return Deadline
If you still prefer filing tax returns on paper, this is the deadline for submitting tax returns for 2024/25. If you miss this deadline, file your tax returns online to avoid penalties.
31st January 2026: Final Self-Assessment Deadline
This is the most crucial tax date of the year for self-assessment taxpayers. It is the final deadline to file your 2024/25 online tax return. Moreover, this is also the due date for any balancing payments, i.e., the tax you still owe.
5th April 2026: End of the UK’s Tax Year 2025/26
This is the end of the UK’s tax year, which means it is time to wind up your financial records for this year and get ready to start the process all over again for the new financial year.
Can’t Keep Track of All the Dates?
Keeping track of all these tax year dates can be tough. That is why having a financial service provider like Stellarwiz can be a wise option. We will take care of all your account tasks, from preparing the documents to filing the taxes and much more, so that you can focus on growing your business. If you need a professional outsourcing CFO who streamlines your finances, get in touch with us today.
