⚡ Flash Sale 20% Discount for New Clients, use code "QUICK20" at Checkout! ⚡
Call our team
+44 (0) 207 566 3939
April 25, 2024
May 7, 2024


Companies House Company Authentication Code for Webfiling

🔑 Key Highlights

  • To get the authentication code, you’ll need to create a WebFiling account with Companies House and receive it to your registered office within 5 working days.
  • The code serves as the equivalent of a company officer’s signature and is used to authorise information filed online.

What is a Company Authentication Code / WebFiling Authentication Code?

The authentication code is a six-digit alphanumeric code issued by Companies House to limited companies. It serves as a company’s official digital signature and indicates authorisation to file online on behalf of a business.

Businesses use it to file on the following Companies House platforms —

How do you get an authentication code sent to your company's registered office address?

To get your code, register for WebFiling and follow the steps below.

  • Sign in to WebFiling.
  • Select either 'Your companies' or 'File for a company'.
  • Enter the company number and select where the company was registered.
  • Select 'Help with authentication code', then 'I do not have an authentication code'.

Companies House will post to your company’s registered office and take about 5 working days to arrive. For privacy and security reasons, Companies House will not send your code to an email ID or tell it to you over the phone.

However, if you incorporated your company through a formation agent, you’ll most likely have the code immediately after incorporation through their online client account.

How do you request an authentication code from Companies House to be sent to a director’s home address?

In response to the impact of COVID-19, Companies House set up a service that allowed company directors to request authentication codes to be sent to their home address instead of the registered office.

To use the service, all you have to provide is —

  • the company number
  • to sign in to or create a Companies House account, which is different from a WebFiling account

You cannot use this service if the company:

  • has filed a document online in the last 30 days
  • is not based in the UK
  • is not a limited company or limited liability partnership (LLP)
  • is dissolved

It takes around 5 working days for an officer to receive an authentication code at their home address.


According to the Companies House website, the request for an authentication code to be sent to a home address service was a temporary service to mitigate the impact of COVID-19. Though the service is still up, we advise individuals to request that their code be sent to their registered office.

How to use your code to file online using the webfiling service

You need your Companies House authentication code for all electronic filings through the WebFiling service, including —

  • Notice of change of company name
  • Change of company details, including confirmation statements and return of allotment of shares
  • Appoint a new director or company secretary, or termination.
  • Change of registered office and SAIL address
  • Annual account filings include changes in accounting reference dates and dormant accounts.

To file, change, or update your company information online, you'll need your:

It's faster and cheaper to file online since paper form filing fees are higher, and it can take weeks before you get an acknowledgement that a document has been received and approved. However, the online filing process has built-in checks to decrease errors and associated rejections.

You’ll need the code for any of the following official electronic filing channels —

To use third-party software, you’ll need to set up an online filing account to get a presenter ID and presenter authentication code.

See also: How to File a Confirmation Statement With Companies House.

How to change your code

You can change the company authentication code as many times as needed to something more memorable but not obvious.

If you suspect an authorised person might know the code or if your company management structure has changed, follow the steps below.

  1. Sign in to your webfiling account using your email address and password.

  2. Enter your company number and the country where the company was registered.

    Enter your company number and the country where the company was registered
  3. Enter the existing authentication code.

    Enter the existing authentication code
  4. Select ‘company authentication’ on the screen's left grey background panel.

    Company Authentication
  5. Indicate that you are changing your code.

  6. Choose a new 6-digit alphanumeric code, mixing numbers and letters.

  7. Re-enter the new code.

    Re-enter the new code
  8. Select 'change code'.

  9. A confirmation of the change with the replacement code will be sent to the registered office address.

Please note the change will take effect immediately. Therefore, it is important to notify anyone who files on your behalf.

How to cancel your code

To cancel your code, log in to the web filing service and follow the steps to change the code. Once you get to step 6, click to tick the box "I wish to cancel the company authentication code."

As soon as you cancel the authentication code, you can no longer file documents electronically with Companies House. You will have to submit paper filings instead.

If you wish to resume electronic filing, you will need to request a new authentication code from Companies House, which will be sent to your company's registered office address.

What to do when you have lost your company authentication code

If you find yourself in the situation of having lost your company authentication code, follow these steps to request a new one:

  • Sign in to WebFiling.
  • Select either 'Your companies' or 'File for a company'.
  • Enter the company number and select where the company was registered.
  • Select 'Help with authentication code', then 'I do not have an authentication code'.

It's important to note that if you previously had an authentication code, Companies House will send you a reminder rather than issuing a new code.

How to protect your authentication code and company details

To protect your company authentication code and other company’s details, it is essential you do not disclose it to any unauthorised person. Consider the following tips for enhancing the overall security of your company.

  • Keep people on a need—to—know basis—Access to your company's sensitive information, including the authentication code, should be on a need-to-know basis. If you are working with an agent, ensure they also have a strict disclosure policy governing how they’ll handle your code. 
  • Do not disclose your code through unsecured channels. Avoid responding to telephone or email requests for your code from unauthorised persons. There are reported cases of fraudsters posing as Companies House and requesting the code through the phone or email. Ignore such requests. 
  • Change it regularly — Over time, your company’s authentication code may become vulnerable due to breaches or leaks. Therefore, it is essential to maintain a consistent schedule of changing the code to reduce the risk of unauthorised access.


Notify Companies House by contacting the frauds team immediately if you suspect an unauthorised person has accessed your code. Further, log in to your website and change or cancel the code.

Article by

Capital Office

Through our insightful content, we aim to demystify the world of virtual offices and empower businesses to thrive in the digital landscape. With a focus on efficiency and professionalism, we bring a wealth of knowledge to help you navigate the dynamic challenges of the business world. Choose us for a virtual office experience that transcends boundaries.

More articles by

Capital Office

June 7, 2024

Register Your Company and Get a Certificate of Incorporation

Are you looking to register your company? Learn how to get your certificate of incorporation, including the online application and replacement procedure.

May 15, 2024

Full List UK Bank Holidays for 2024 and Other Special Days

Find a complete list of UK bank holidays in 2024 for England and Wales, Scotland and Northern Ireland

In a hurry and just want some advice?

Our friendly team are on hand to help, get in touch today

Call us at

+44 (0) 207 566 3939

Email us at