How do I register my new business with HMRC?

Firstly, you need to work out which tax year your start date falls into. The tax year runs from 6th April to 5th April, so at time of writing (July 2026) your start date falls into the tax year ended 5th April 2027.  

You must register by the following 5th October, i.e. 5th October 2027. As you are registering as self-employed, you should use the registration tool on HMRC’s website here. 

Although you have some time before you need to register, avoid leaving it too long as you may face penalties for late registration.  

Please note, this is merely self-assessment and does not include VAT or employment taxes. 

Contact TaxAssist Accountants on 0203 859 0999 or online here for help meeting your responsibilities with HMRC.  

We can also help you set up your bookkeeping records, put together a cashflow forecast and assist with business plans and funding applications. 

Last updated 9 Jul 2026 | First published 5 Oct 2017

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This article is intended to inform rather than advise and is based on legislation and practice at the time. Taxpayer’s circumstances do vary and if you feel that the information provided is beneficial it is important that you contact us before implementation. If you take, or do not take action as a result of reading this article, before receiving our written endorsement, we will accept no responsibility for any financial loss incurred.

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