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If you complete your Self Assessment tax return on paper, there's an important deadline approaching. For the 2025/26 tax year, HMRC must receive paper Self Assessment tax returns by 31 October 2026.
Missing this deadline could result in a late filing penalty, so it's important to make sure your paperwork is accurate, complete and submitted in plenty of time.
Whether you're self-employed, a landlord or have other income that needs to be declared, here's what you need to know before the deadline.
The deadline for submitting a paper Self Assessment tax return for the tax year ending 5 April 2026 is 31 October 2026.
It's important to remember that HMRC must receive your completed return by this date. Simply posting it on 31 October won't necessarily mean it arrives on time. If you're planning to submit a paper return, allow plenty of time for delivery.
The main deadlines are:
Different filing deadlines may apply in certain circumstances, such as when HMRC issues a notice to file later than usual.
If your paper tax return isn't received by the deadline, you could face an initial £100 late filing penalty, even if you don't owe any tax. Additional penalties may apply if your return remains outstanding.
However, missing the paper deadline doesn't necessarily mean you've missed your opportunity to submit your return on time. In most cases, you can still complete and submit your Self Assessment tax return online by 31 January 2027 instead.
If you're unsure what to do, seeking professional tax return help can make the process easier and help you avoid unnecessary penalties.
Before completing your Self Assessment return, make sure you have the relevant financial information available.
Depending on your circumstances, this may include:
Accurate bookkeeping can make gathering this information much easier, particularly if you're self-employed or running a small business.
Although paper returns are still an option for many taxpayers, online filing offers several advantages.
These include:
If you're approaching the paper deadline and haven't started preparing your return, online filing may be a more practical option.
A professional Self Assessment accountant can also help you understand your filing responsibilities and prepare your return accurately.
At Pristine Accounts, we provide professional Self Assessment services to individuals, sole traders and business owners across the UK.
We can help you prepare your financial information, understand your tax obligations and ensure your return is completed accurately.
Our wider services include:
As a Xero Silver Partner, we also help businesses maintain accurate digital financial records throughout the year, reducing the pressure of gathering information when tax deadlines approach.
Rather than leaving everything until January, our proactive approach helps clients stay organised and better prepared for their tax responsibilities.
The deadline for HMRC to receive paper Self Assessment returns for the 2025/26 tax year is 31 October 2026, unless a different deadline applies to your circumstances.
Yes. In most cases, you can still submit your return online by 31 January 2027 without receiving a late filing penalty, provided you meet the applicable online deadline.
A late paper return can trigger a £100 penalty, even if no tax is due. Filing online by the applicable online deadline can generally avoid this.
Yes. A professional accountant can help gather the required information, identify relevant expenses and reliefs, and prepare and submit your return on your behalf.
Yes. Pristine Accounts provides Self Assessment services alongside ongoing bookkeeping and general accountancy support, helping you maintain accurate financial records throughout the year.
The 31 October paper tax return deadline is an important date for anyone planning to submit their Self Assessment return by post. Preparing early gives you time to gather the necessary information, check your figures and avoid unnecessary pressure as the deadline approaches.
At Pristine Accounts, we help individuals and business owners manage their Self Assessment responsibilities with professional, practical support.
Need help with your Self Assessment tax return? Contact Pristine Accounts today to find out how our team can help you prepare and submit your return with confidence.