Self-Assessment Deadlines in October
Registering for self-assessment
Taxpayers who are required to submit tax returns for the first time regarding the 2017/18 tax year (i.e. between 6 April 2017 – 5 April 2018) are required to register for self-assessment by 5 October 2018.
Failing to notify HMRC by the deadline and failing to pay tax due by the 31 January 2019 deadline may result in a penalty.
This penalty is calculated as a percentage of the income and/or capital gains tax that is late for payment.
The percentage that will apply is determined in light of the behaviour of the taxpayer (non-deliberate, deliberate, or deliberate and concealed), whether or not the taxpayer made a “prompted” or “unprompted” disclosure, and the amount of time that has passed between the tax becoming unpaid and HMRC becoming aware of the failure.
The time limit for HMRC to assess for failure to notify is up to 20 years.
Ways to register
- You can register online on the gov.uk website here
- Alternatively, you can fill this form online and then print off and post to HMRC.
Tax returning filling deadlines
The deadline for submitting your 2017/18 tax return by paper is 31 October 2018.
If the paper return is issued after the 31 October 2018 the return deadline is 3 months from the date of notice.
If you would rather submit your 2017/18 tax return online, the deadline is 31 January 2019.
Any tax due for the 2017/18 tax year is due for payment by 31 January 2019.
Who needs to submit a tax return?
You will be required to submit a tax return where you are liable to additional tax which has not been collected at source (i.e. via PAYE).
Common situations when a tax return may be required can be found on the tax returns page of our website.
If you are unsure whether you must register for self-assessment, need help filing a tax return, or are unsure of whether you need pay any tax, please contact a member of our team.