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There are a number of reasons why you may need to register with HMRC to submit a tax return. This includes if you:
If you need to complete a tax return for the first time, you should inform HMRC as soon as possible. The latest date that HMRC should be notified is by 5 October following the end of the tax year for which a return needs to be filed.
So, if you had income that necessitated you registering for Self Assessment in the 2018-19 tax year, you will need to notify HMRC by 5 October 2019.
HMRC publishes a list of taxpayers who would usually be required to submit a Self Assessment return. The list includes:
In certain limited circumstances HMRC can also ask you to complete tax returns for other reasons.
Need help registering for Self-Assessment?
If you are unsure if you need to register, or would like assistance with the formal registration process, please call.
Source: HM Revenue & Customs | 03-04-2019