Tax fines due to dispute with previous employer

Is there a way I can submit my self-assessment for 20/21 period? there is an ongoing dispute about payments with my previous employer which makes filing my self assessment impossible I have been informed that I cannot submit the self assessment and edit it the information provided as it could be seen as a crime. Am I also able to appeal the fines on this basis as well as other health issues?

I'm just a member of the public, not associated with HMRC in any way, but if you have an obligation to submit a tax return for 20/21 and have still not done so, I think you need to urgently take professional advice. Near the end of the tax return is a section to declare that the return includes estimated or provisional figures - given this option exists, it seems difficult to justify not submitting a return at all based on unavailability of final figures. I fear that whoever has been informing you that you were unable to submit a return at all may be incorrect and have done you a great disservice. Again, I'm not associated with HMRC in any way, but I think your chances of a successful appeal may have been damaged by not supplying at least a return with provisional figures at any point in the 3 years since the deadline passed. But, this being an anonymous internet forum, we can't know the fine details of your case - a professional advisor ought to be able to give you a better idea of whether you have reasonable grounds for appeal.

Hi JimAb,
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Thank you.