Self Assessment tax returns.
Self-Assessment is a system HM Revenue and Customs (HMRC) uses to collect Income Tax. HM Revenue and Customs (HMRC) must receive your tax return and any money you owe by the deadline.
The last tax year started on 6 April 2015 and ended on 5 April 2016.
Self Assessment Deadline:
Register for Self Assessment: 5 October 2016.
Paper tax returns: Midnight 31 October 2016.
Online tax returns: Midnight 31 January 2017.
Pay the tax you owe: Midnight 31 January 2017