Self assessment key dates 2018/19 and 2017/18

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.

31 January 2017 – First payment on account due for 2016/17 tax year. 31 July 2017 – Second payment on account for 2016/17 tax year.

5 October 2017 – Deadline for notifying HMRC of new sources of income (including the Child Benefit charge) if no tax return has been issued for 2016/17 tax year.

31 October 2017 – Deadline for submission of 2016/17 non-electronic returns.

30 December 2017 – Deadline for submission of 2016/17 electronic tax returns if ‘coding out’ of any underpayment is required.

31 January 2018 – Deadline for filing electronic tax returns for 2016/17. Balancing payment due for 2016/17 tax year. First payment on account due for 2017/18 tax year.