untied’s pulled together the top reasons why people miss the self-assessment tax filing deadline and what you can do to make sure you hit it with ease.
1. Not knowing the deadline or the requirement to file
Be in the know with untied’s self-employed self-assessment tax hub and read this blog post on the extended deadlines
2. Not knowing where to start
Take control of your filing with untied’s famous tax checklist
3. Lost UTR – Unique Taxpayer Reference
Check the format with untied and get help to request a reminder
4. No HMRC login
Use untied express submit to file without an HMRC login
5. Worrying about what’s due
untied tells you ahead of time, or see our ready reckoner – you can also make arrangements to pay once you’ve filed
6. Not having all the information
Use untied to file, and you’re able to submit an amendment if you get new information.
Community members enjoy a discount of 25% on untied Pro by clicking here.
If you are a member of Community and need help or advice, please contact us at help@community-tu.org or on 0800 389 6332.
© Community Trade Union 2026
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If you have any further queries, please contact our Service Centre Department on 0800 389 6332 or at servicecentre@community-tu.org.
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