Self Assessment – Key Dates 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.