If you became self-employed, started a side business, or earned income outside of PAYE in the last tax year, you may need to complete a Self Assessment tax return. To do this, you must first register with HMRC — and the deadline for registration is 5 October 2025 for the 2024/25 tax year.
Missing this deadline could delay your ability to file your return, increase the risk of penalties, and make managing your taxes more stressful.
Who Needs to Register for Self Assessment?
You must register if you earned untaxed income, such as:
- Self-employment or freelance income
- Rental income from property
- Dividends or investment income
- Foreign income
- Income over £100,000, even if on PAYE
If you’re unsure whether you need to register, it’s always best to check with a tax adviser.
Key Self Assessment Deadlines for 2025
- 5 October 2025 – Register for Self Assessment if it’s your first time.
- 31 October 2025 – Deadline for paper returns.
- 31 January 2026 – Deadline for online returns and any tax due.
How to Register
Registration can be done online through HMRC, after which you’ll receive a Unique Taxpayer Reference (UTR). This number is essential for filing your tax return. The process can take several weeks, so registering early is highly recommended.
How Persona Finance Can Help
At Persona Finance, we support individuals and businesses with:
- Registering for Self Assessment before the October deadline
- Preparing and submitting tax returns accurately and on time
- Identifying allowances and reliefs to reduce your tax bill
- Providing ongoing advice to stay compliant with HMRC
📩 Don’t leave it too late. Contact Persona Finance today to get help with Self Assessment registration and filing — and make tax season stress-free.
