Self Assessment Deadlines and When to Register
Self Assessment Deadlines and When to Register
If you receive income that is not taxed through PAYE—such as self-employment earnings, rental income, or dividends—you may need to complete a Self Assessment tax return. Understanding when to register and what deadlines apply is crucial to staying compliant and avoiding penalties.
Who Needs to Register for Self Assessment?
You must register for Self Assessment with HMRC if you:
Are self-employed as a sole trader and earned more than £1,000 in a tax year
Are a partner in a business partnership
Receive rental income from property
Have untaxed income from dividends, savings, or investments
Need to report capital gains or claim tax reliefs
Earn over £100,000 annually
Not sure if you need to file? Contact our team for a quick eligibility check.
When to Register for Self Assessment
If this is your first time filing, you must register with HMRC by:
🗓️ 5 October following the end of the tax year.
For example:
To file for the 2024/25 tax year (which ended on 5 April 2025), you must register by 5 October 2025.
Registration provides you with your Unique Taxpayer Reference (UTR), which is required to submit your return.
Key Deadlines for Self Assessment
Once registered, make note of the following key dates:
5 October 2025 – Deadline to register for Self Assessment (for 2024/25 tax year)
31 October 2025 – Deadline to submit a paper tax return
31 January 2026 – Deadline to submit an online tax return
31 January 2026 – Deadline to pay any tax owed
31 July 2026 – Deadline for the second payment on account (if applicable)
Missing these deadlines may result in automatic penalties and interest.
Penalties for Late Filing or Payment
HMRC may charge the following:
£100 fixed penalty if your return is up to 3 months late
£10 daily penalty (up to 90 days) for continued non-filing
Additional penalties after 6 and 12 months
Interest on late payments
Delays can become costly—act early to avoid unnecessary charges.
How We Can Help
At Barnett & Co Accountants, we take the stress out of Self Assessment. Our services include:
✅ Determining whether you need to file
✅ Registering you with HMRC
✅ Preparing and filing your tax return accurately
✅ Advising on payments on account and tax planning
✅ Ensuring you claim all eligible allowances and reliefs
Get Started Today
Let us help you meet your Self Assessment obligations on time and with confidence.
📞 Call us: 0345 646 1516
📧 Email: info@barnettandco.uk
📍 Visit us: Electra House, Electra Way, Crewe, CW1 6GL
💬 WhatsApp: 07867770009
