The last tax year started on 6 April 2017 and ended on 5 April 2018

Self Assessment Deadlines

Register for Self Assessment if you are self employed or  sole trader, not self-employed, or registering a partner or partnership – 5 October 2017
Paper tax returns – Midnight 31 October 2018
Online tax returns –  Midnight 31 January 2019
Pay the tax you owe – Midnight 31 January 2019