Self Assessment – Key Dates

31 January 2019 – First payment on account due for 2018/19 tax year.

31 July 2019 – Second payment on account for 2018/19 tax year.

5 October 2019 – Deadline for notifying HMRC of new sources of income (including the Child Benefit charge) if no tax return has been issued for 2018/19 tax year.

31 October 2019 – Deadline for submission of 2018/19 non-electronic returns.

30 December 2019 – Deadline for submission of 2018/19 electronic tax returns if ‘coding out’ of any underpayment is required.

31 January 2020 – Deadline for filing electronic tax returns for 2018/19. Balancing payment due for 2018/19 tax year. First payment on account due for 2019/20 tax year.