October

5th

  • Deadline for notifying HM Revenue and Customs of chargeability to income or capital gains tax for the tax year ended 5th April 2017

22nd

  • Deadline for electronic payment of PAYE settlement agreement (if any) for tax year ended 5th April 2017 (for non-electronic payments the deadline is 19th October 2017)

31st

  • Deadline for the submission of paper Self-Assessment Tax Return for tax year ended 5th April 2017

November

2nd

  • Quarterly submissions of P46(car) for employees whose car and or fuel benefit has changed in the last quarter leading up to 5th October 2017

5th

  • Date from which employers should expect a letter indicating their online filing and electronic obligations

December

30th

  • Self-Assessment Tax Return deadline if underpayment of tax is less than £3,000 and it is to be included in 2018-19 PAYE code