In response to the question posted by Jasyl on 03/01/19 11:25
If you are unable to submit your return before 31 January 2019 you may incur a £100 late filing penalty. You can appeal penalties but we need to have the tax return on file.
Please contact the self assessment helpline on 0300 200 3310 for assistance to complete the return.
We can also make a note on your record that you have problems filing online.
I hope this helps.