The 2017-18 tax return deadline for taxpayers who continue to submit paper Self-Assessment returns, is 31 October 2018. Late submission of a Self-Assessment return will become liable to a £100 late filing penalty. The penalty usually applies even if there is no liability or if any tax due is paid in full by 31 January 2019. We would recommend that anyone still submitting paper tax returns to consider the benefits of submitting the returns electronically.
We also recommend that if your Self-Assessment is outstanding for the year ended 05 April 2018 to get this completed at your earliest convenience so that you still have time to pay any tax owed before the deadline of 31 January 2018