- HMRC compliance checks, appeals, interest and penalties
- Changing your business details for Corporation Tax
- Making a loss and Corporation Tax
- Selling or closing your company and Corporation Tax
Changing your business details for Corporation Tax
There are a number of occasions when you need to tell HM Revenue & Customs (HMRC) about changes to your business details for Corporation Tax. For example, you'll need to tell HMRC if you change the contact details for your company or organisation, or appoint an accountant or tax adviser to deal with your Corporation Tax affairs.
This guide explains when and how to tell HMRC about these changes to your company or organisation. It also explains how you can tell HMRC about many of these changes online.
On this page:
- Changing your company name or contact details for Corporation Tax
- Updating your details online
- Limited companies - changes to a registered company name and/or address
- Adding or changing your authorised agent
- Changing your Corporation Tax accounting period
- More useful links
Changing your company name or contact details for Corporation Tax
You should tell HMRC (and in some instances Companies House - see the section on changing your registered company name and/or address below) as soon as possible if your company or organisation’s name or contact details change.
You should do this even if you’ve already informed other HMRC tax areas such as VAT or PAYE. You can do this online or by post. The following sections show you how to do this.
Updating your details online
If your company or organisation is signed up (known to HMRC as registered or enrolled) to use the HMRC Online Service - Corporation Tax Online - you can easily and securely add, change or delete your company or organisation details.
If you’ve appointed an accountant or tax adviser (an agent) to deal with HMRC on your behalf for Corporation Tax, they can also update your details online.
Limited companies
Limited companies can update the following details online using Corporation Tax Online:
- contact or communication postal address (but not your company’s registered office)
- phone numbers - daytime, evening, mobile for your registered office and/or business, contact or communication address
- email for your contact/communication address or registered office
- fax number - for your registered office and/or business, contact or communication address
Organisations
Unincorporated organisations such as clubs or associations can update the following details using Corporation Tax Online:
- organisation name
- organisation’s address
- contact or communication address
- email for your contact or communication address
- phone numbers - daytime, evening, mobile for your contact or communication address
- fax number for your organisation's office and/or business or contact or communication address
How to update your business details online
If you're already signed up to use Corporation Tax Online, use the link at the end of this section to go to the login page. Then:
- log in using your User ID and password
- click 'About your organisation' from the left-hand menu
- click 'Change contact details' in the right-hand box
- change your information
- click on the 'Next' button
- click the box to confirm the new details you've given are correct
- click on the 'Next' button
- print or save a copy of the screen that confirms the new details and shows your reference number for the changes you've made
Any online changes you make will normally be updated within 48 hours. (This may take slightly longer over a weekend or Bank Holiday.)
If you're not yet signed up to use Corporation Tax Online you can register
by following the link at the end of this section.
Alternatively you can contact your Corporation Tax Office about changes
to your company or organisation’s name or contact details. To find
your Corporation Tax Office, follow the link at the end of this section.
See a demonstration of how to change your Corporation Tax details online
Corporation Tax Online: the benefits and how to sign up
Log in to Corporation Tax Online
Find your Corporation Tax Office
Limited companies - changes to a registered company name and/or address
If you want to change the registered name and/or the registered office address of your limited company you must first tell Companies House and then tell HMRC.
You can inform Companies House online at the Companies House website. After you've done that, you can contact your Corporation Tax Office.
Go to the Companies House website
Find your Corporation Tax Office
Adding or changing your authorised Corporation Tax agent
If you've appointed a tax adviser or an accountant to act as your authorised agent to deal with HMRC on your behalf for Corporation Tax matters, you can let HMRC know about any changes using Corporation Tax Online. You can add, change or remove your authorised agent online.
If you're already signed up to use Corporation Tax Online, use the link at the end of this section to go to the login page. Then follow these steps to notify HMRC of any changes:
- log in using your User ID and password
- click 'About your organisation' from the left-hand menu
- click on the link in the 'Agent details' box
- follow the instructions to add or amend details
- print or save a copy of the screen that confirms the new details and shows your reference number for the changes you've made
Any online changes you make will normally be updated within 48 hours. (This may take slightly longer over a weekend or Bank Holiday.)
If you're not yet signed up to use HMRC Corporation Tax Online Services you can register by following the link at the end of this section.
You can also tell HMRC you’ve appointed or changed your agent by downloading form 64-8 (Authorising your agent), filling it in and sending it back to your Corporation Tax Office. You can find your Corporation Tax Office using the link at the end of the list below.
See a demonstration of how to change your authorised agent online
Find out how to set up a Corporation Tax Online Services account
Log in to Corporation Tax Online
Go to form 64-8 (Authorising your agent)
Find your Corporation Tax Office
Changing your Corporation Tax accounting period
If you file your Company Tax Return using Corporation Tax Online, you can easily change your Corporation Tax accounting period. On the ‘Period of return’ page, select the particular accounting period you want to amend and click on ‘change period’. Then follow the on-screen instructions.
Any online changes you make will normally be updated within 48 hours. (This may take slightly longer over a weekend or Bank Holiday.)
Alternatively, you can contact your Corporation Tax Office.
See a demonstration of how to change your accounting period
Log in to Corporation Tax Online
Find your Corporation Tax Office
More useful links
Trading and non-trading for Corporation Tax explained
