Filing the Paper Self Employed Tax Return and Filing the Tax Return Online
HMRC will send the paper self employed tax return to your registered address each year which has to be submitted by 31st October following the end of the financial year.
Tax returns can still be filed later by filing online by the following 31st January.
If the intention is to file online the sole trader has to first register with the HMRC website and the password is sent by post usually within 7 to 10 days so registration should be completed well in advance.
The main benefit of filing online is the immediate calculation of the income tax and national insurance liability. HMRC frequently experience computer problems on the last day of filing and it is better to file online at least 5 days before the deadline to avoid these problems and potential late filing penalties

