How to Request a Company Authentication Code: The Correct Step-by-Step WebFiling Guide

How to Request a Company Authentication Code

If you’ve lost your company authentication code or need to file online for the first time, this guide explains exactly how to request a new one through GOV.UK WebFiling.

A company authentication code is essential for filing documents with Companies House. Without it, you cannot submit annual accounts, confirmation statements, or update company details online. The process to request one is straightforward — but it must be done correctly.

Below is the precise step-by-step method.

What Is a Company Authentication Code?

A company authentication code is a 6-character alphanumeric code issued by Companies House. It acts as your company’s digital signature for online filings.

Why Companies House Issues an Authentication Code

Companies House uses the code to verify that the person submitting documents is authorised to act for the company.

It protects against fraudulent filings and unauthorised changes.

What the 6-Character Code Is Used For

You need the authentication code to:

• File annual accounts

• Submit confirmation statements

• Change company details

• Appoint or remove directors

• Authorise an accountant to file on your behalf

Without it, WebFiling access is restricted.

When You Need to Request a New Authentication Code

You may need to request a replacement if:

Lost or Misplaced Code

The original code letter has been misplaced.

Changing Accountants

Your previous accountant held the code.

First-Time Online Filing

You’ve never filed through WebFiling before.

Important Facts Before You Start

Before requesting a replacement, understand these key points:

The Code Is Sent by Post Only

Companies House does not email authentication codes.

It Is Sent to the Registered Office Address

The code is delivered to the official address listed on the Companies House register.

If this address is outdated, update it first.

Delivery Timeframe

The authentication code usually arrives within 5 working days.

What You Need Before Requesting the Code

Prepare the following details:

1. Company Number

This must match exactly what appears on Companies House records.

Example format:

• 8 digits
  OR

• 2 letters and 6 digits

You can verify details here:
https://www.gov.uk/get-information-about-a-company

2. Company Name as Registered

Enter the name exactly as shown on the register.

3. Active Status Confirmation

The company must be active.

Dissolved or struck-off companies cannot request authentication codes.

Step-by-Step Guide: How to Request a Company Authentication Code

Follow these exact steps.

Step 1: Log in to GOV.UK WebFiling

Go to the Companies House WebFiling service and sign in to your account.

If you do not have an account, create one first.

Step 2: Select “File for a Different Company”

After logging in, scroll to the bottom and click:

“File for a different company”

tep 3: Enter the Company Number

Input your company number carefully.

Select the correct company when displayed.

Confirm:

• Company name

• Company number

• Status (Active)

• Incorporation date

• Registered office address

Click Confirm and Continue.

Step 4: Click “I Do Not Have an Authentication Code”

When prompted to enter the 6-character code, select:

“I do not have an authentication code.”

Step 5: Request a New Authentication Code

Click:

“Request an authentication code”

The system will confirm that the code will be sent by post to the registered office address.

Step 6: Submit the Request

Confirm the address shown is correct.

Submit the request.

You will see confirmation that:

An authentication code has been requested.
It will be sent by post within approximately 5 working days.

That’s it — the request is complete.

What Happens After You Submit the Request

Once received:

• Enter the new authentication code in WebFiling

• Save company details to your account

• Authorise your accountant digitally if required

You will not need to re-enter the code for most future filings.

Common Mistakes to Avoid

Avoid these common errors:

• Entering the wrong company number

• Using an outdated registered office address

• Expecting the code by email

• Requesting multiple codes unnecessarily

Each new request invalidates previous codes.

Why Professional Accounting Support Matters

Requesting an authentication code is straightforward. However, the real issue is often what comes next.

Are your accounts filed on time?
Is your confirmation statement up to date?
Are Companies House deadlines approaching?

At Spondoo, we ensure your Companies House filings are handled correctly and on time. From annual accounts to confirmation statements and director updates, we manage the process professionally and proactively.

Instead of reacting to deadlines, let us keep you compliant year-round.

👉 Book a consultation today and let Spondoo manage your company filings properly.

Frequently Asked Questions (FAQs)

1. How long does it take to receive the authentication code?

Usually within 5 working days by post.

2. Can Companies House email the code?

No. It is sent by post only.

3. What if I request multiple codes?

Each new request cancels the previous code.

4. Is the authentication code the same as a UTR?

No. The UTR is issued by HMRC for tax purposes. The authentication code is issued by Companies House for filings.

5. Can my accountant request the code?

Yes, if authorised and using the correct company details.

Final Thoughts and Next Steps

A company authentication code is essential for online filings with Companies House. The request process is simple, secure, and completed through GOV.UK WebFiling.

However, filing documents correctly and on time is what truly protects your company from penalties and compliance issues.

If you’d rather not manage Companies House filings alone, we can take care of it for you — accurately, efficiently, and on time.