Hi,
If you've already completed your return but keep receiving reminders to file, you may not have fully submitted your return to us.
Log back into where you completed your return, if the return has not been fully submitted, all of the details you entered will still be present.
You should be then able to access the end of the return and complete your submission.
If you have already fully submitted your return, contact us via link below and we can review your record.
Self Assessment: general enquiries
Thank you.