Self assessment - key dates
2019/20
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.
2018/19
31 January 2018 - First payment on account due for 2017/18 tax year.
31 July 2018 - Second payment on account for 2017/18 tax year.
5 October 2018 - Deadline for notifying HMRC of new sources of income (including the Child Benefit charge) if no tax return has been issued for 2017/18 tax year.
31 October 2018 - Deadline for submission of 2017/18 non-electronic returns.
30 December 2018 - Deadline for submission of 2017/18 electronic tax returns if 'coding out' of any underpayment is required.
31 January 2019 - Deadline for filing electronic tax returns for 2017/18. Balancing payment due for 2017/18 tax year. First payment on account due for 2018/19 tax year.