Every UK limited company must file a confirmation statement with Companies House at least once every 12 months — even if nothing has changed.
A CS01 confirmation statement is the Companies House filing used to confirm that the information held about your company is accurate and up to date.
If you have been searching for CS01, CS01 filing, CS01 Companies House or how to file a confirmation statement, this guide explains what you need to know.
Important: Dormant and non-trading companies must also file a CS01 confirmation statement. You still need to file even if your company has never traded or nothing has changed.
A CS01 is the form used to file a company's annual confirmation statement with Companies House.
The confirmation statement replaced the old annual return (AR01) and is designed to confirm that the information held on the Companies House register remains correct.
A CS01 is not the same as annual accounts. Your annual accounts report financial information, while the CS01 confirmation statement confirms key information about the company itself.
The CS01 filing can include information relating to:
Company shareholders
Share capital
SIC code and business activities
Trading status of shares
People with significant control (PSC) information where applicable
Registered email address
Director identity verification details where required
Yes.
Every company registered in the UK must file a confirmation statement at least once every 12 months.
This includes:
Trading companies
Dormant companies
Non-trading companies
Companies that have never traded
Companies where no information has changed
One of the most common CS01 mistakes is assuming that a company does not need to file if nothing has changed.
Nothing has changed? You still need to file your confirmation statement. The purpose of a CS01 is to confirm that the information held by Companies House remains accurate.
When you file a CS01, you may need to confirm or update several areas of your company's information.
Depending on your company, this can include:
SIC code: The code describing your company's registered business activity.
Shareholders: Information about members and shareholdings.
Share capital: Details of issued shares and share capital.
PSC information: People with significant control where applicable.
Trading status: Information about the company's shares.
Registered email address: Companies must provide a registered email address where required.
Identity verification: Director identity verification details where required under current Companies House rules.
If other company information has changed, such as your registered office address or directors, you may need to notify Companies House separately using the relevant filing.
Yes.
You must file your annual confirmation statement even when there have been no changes to your company.
This means you still need to file a CS01 if:
Your company is dormant
Your company has never traded
You have no employees
Your shareholders have not changed
Your directors have not changed
Your SIC code has not changed
There have been no significant company changes
Yes.
The terms CS01 and confirmation statement are commonly used to describe the same Companies House filing.
CS01 is the form reference, while the filing itself is called a confirmation statement.
You may therefore see people searching for:
CS01
CS01 form
CS01 confirmation statement
CS01 Companies House
confirmation statement
Companies House confirmation statement
These searches generally relate to the same annual company filing requirement.
A confirmation statement and annual accounts are two different Companies House filing obligations.
Feature | CS01 Confirmation Statement | Annual Accounts |
|---|---|---|
Purpose | Confirms company information | Reports financial information |
Required annually | ✔ Yes | ✔ Yes |
Required for dormant companies | ✔ Yes | ✔ Yes |
Financial reporting | ❌ No | ✔ Yes |
Current online filing fee | £50 | No standard Companies House filing fee |
Your company may therefore need to file both a CS01 confirmation statement and annual accounts during the same year.
Your company must file a confirmation statement at least once every 12 months.
The first confirmation statement is based on your company's incorporation date. Subsequent confirmation statement deadlines are based on the previous confirmation statement date.
You can check your company's confirmation statement date and filing information on the Companies House register.
For more information, read our guide: CS01 Confirmation Statement Deadline: When Do You Need to File?
The current Companies House fee for filing a confirmation statement is:
£50 for online CS01 filing
£110 for paper filing
For most companies, CS01 online filing is the quickest and simplest option.
Yes.
Companies can file their confirmation statement online using Companies House services or through suitable filing software.
Online CS01 filing allows you to review your company information, confirm the details and submit the confirmation statement electronically.
If you are looking for a simple way to file CS01 online, FCS provides a straightforward filing service.
Failing to file your confirmation statement can result in enforcement action by Companies House.
Your company may receive a financial penalty and continued failure to file can ultimately result in the company being struck off the Companies House register.
Do not ignore your CS01 deadline. Even dormant companies can face consequences if their confirmation statement is not filed.
Common mistakes when filing a confirmation statement include:
Assuming dormant companies do not need to file a CS01
Missing the confirmation statement deadline
Confusing CS01 with annual accounts
Using incorrect shareholder information
Using an incorrect SIC code
Failing to check PSC information
Not completing required identity verification
Failing to provide a registered email address where required
If you need to file a CS01, the process generally involves reviewing your company's information and confirming that it is accurate.
Before submitting your confirmation statement, check:
Your company name and registration details
Shareholders and share capital
SIC code
PSC information
Registered email address
Director identity verification requirements
You should also make sure that any changes which require a separate Companies House filing have already been reported.
For a step-by-step explanation, see: How to File a CS01 Confirmation Statement
If your company is dormant, you still need to file a CS01 confirmation statement.
Dormant companies generally have simplified accounting requirements, but they remain subject to Companies House filing obligations.
A dormant company will normally need to deal with both:
Dormant company accounts
Annual confirmation statement (CS01)
These are separate filings and should not be confused.
✔ Check your CS01 confirmation statement date
✔ Review your Companies House information
✔ Check shareholders and share capital
✔ Check your SIC code
✔ Check PSC information
✔ Complete required identity verification
✔ Check your registered email address
✔ File your CS01 before the deadline
Need to file your CS01?
FCS makes CS01 online filing straightforward, helping you complete your confirmation statement without the complexity of full accounting software.
A CS01 confirmation statement is an important annual Companies House filing.
Every company, including dormant and non-trading companies, must file a confirmation statement at least once every 12 months - even when nothing has changed.
Checking your information and completing your CS01 filing on time helps keep your company compliant and avoids unnecessary problems.
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