29/09/2026
If you may need to complete a Self Assessment tax return for the 2025/26 tax year, check whether you need to notify HMRC before the deadline.
This may apply if you:
✓ Are newly self-employed and may need to complete a tax return
✓ Receive rental income or have other income that may need reporting
✓ Were previously registered for Self Assessment but did not need to submit a 2024/25 return
✓ Have circumstances that mean you may need to file a tax return
The 5 October 2026 deadline does not apply to everyone, so check HMRC guidance based on your individual circumstances.
At Walden Way & Co, we help individuals and businesses understand important tax deadlines and prepare with confidence.
📌 Check whether you need to register before the deadline.