This guide is maintained as a current resource for September 2026 and covers only the laws of England and Wales. Information is for general guidance, not legal advice. Consult a qualified solicitor for advice specific to your situation.
Detailed explanation of the IN01 form used for UK company incorporation, including all required information such as directors, shareholders, share capital, registered office, PSC details, and filing requirements with Companies House.
The IN01 form is the official application used to incorporate a company in the United Kingdom. It is submitted to Companies House and forms the legal foundation of a new company's existence under the Companies Act 2006.
The form collects essential details about the proposed company, including its name, structure, officers, share capital (where applicable), registered office, and compliance statements. Once accepted, it leads to the issue of a certificate of incorporation, confirming the company's legal status.
Understanding the IN01 form is essential because errors or omissions can delay registration, result in rejection, or require resubmission.
What Is the IN01 Form?
The IN01 form is a statutory incorporation application used to register:
- Private limited companies (Ltd)
- Public limited companies (PLC)
- Companies limited by guarantee
- Some special company types depending on structure
It can be submitted online or in paper form. The paper version is typically longer and requires additional supporting documentation, including the memorandum and articles of association where relevant.
Once registered, the company becomes a separate legal entity capable of entering contracts, owning assets, and incurring liabilities in its own name.
Key Information Required in the IN01 Form
The IN01 form is divided into structured sections. Each section captures specific legal and administrative details.
1. Proposed Company Name
The applicant must provide:
- Full company name
- Correct legal ending (e.g. “Limited” or “Ltd”)
- Confirmation that the name is not already registered or too similar to an existing company
Names that are misleading, offensive, or restricted may be rejected by Companies House.
2. Registered Office Address
The registered office is the official address of the company. It must:
- Be located in the same UK jurisdiction where the company is registered
- Be a physical address (not a PO Box alone)
- Be capable of receiving official correspondence
This address is publicly available on the register maintained by Companies House.
3. Jurisdiction of Incorporation
The form requires confirmation of where the company is being incorporated:
- England and Wales
- Wales
- Scotland
- Northern Ireland
This determines the legal framework and filing obligations applicable to the company.
4. Director Details
At least one director is required for a private limited company. The IN01 form requires:
- Full name
- Date of birth (partially visible on the public register)
- Nationality
- Occupation
- Service address (public)
- Residential address (not publicly visible but required)
Directors must meet eligibility requirements, including being at least 16 years old and not disqualified from acting as a director.
5. Company Secretary (If Applicable)
A company secretary is optional for most private limited companies but mandatory for some public limited companies. Where appointed, the following details are required:
- Name
- Service address
- Consent to act
6. Statement of Capital and Shareholdings
For companies limited by shares, the IN01 form must include:
- Number of shares issued
- Share class (e.g. ordinary shares)
- Nominal value per share
- Total issued share capital
- Rights attached to each share class
This section defines ownership structure and financial rights within the company.
Errors in this section are a common cause of rejection by Companies House due to inconsistencies or missing totals.
7. Shareholders (Subscribers)
The form must list initial shareholders (subscribers), including:
- Full names
- Addresses
- Number of shares taken on incorporation
- Signature or authentication details (depending on filing method)
These individuals become the first members of the company.
8. People with Significant Control (PSC)
Companies must disclose individuals or entities who have significant control over the company. This may include:
- Ownership of more than 25% of shares
- Voting rights exceeding 25%
- Rights to appoint or remove directors
PSC transparency requirements form part of UK anti-money laundering and corporate transparency rules.
9. Articles of Association
Applicants must confirm which governing rules apply:
- Model articles (standard default rules)
- Modified model articles
- Bespoke articles drafted for the company
Only one option can be selected. Incorrect selection can result in rejection.
10. Memorandum of Association
The memorandum confirms that the initial members agree to form the company and become members upon incorporation. It includes:
- Company name
- Subscriber details
- Agreement to form the company
It is required for incorporation and forms part of the statutory filing package.
11. Registered Email Address
A valid email address must be provided for official communications from Companies House. This is used for statutory reminders and filing notices.
12. Standard Industrial Classification (SIC) Codes
SIC codes describe the company's trading activities. Examples include:
- Consulting services
- Construction
- Software development
- Retail activities
Multiple SIC codes may be used depending on business scope.
Common Errors in the IN01 Form
Errors frequently occur in the following areas:
- Incomplete statement of capital totals
- Missing or incorrect share class details
- Invalid company name format
- Selecting multiple articles options
- Inconsistent director information
- Missing PSC disclosures
Such issues may lead to rejection or delays in incorporation processing.
Filing the IN01 Form
The IN01 form can be submitted:
- Online via the Companies House incorporation service
- By post using the paper form
Fees vary depending on the method of submission. Paper filings generally cost more and take longer to process.
Once accepted, Companies House issues a certificate of incorporation confirming the company's legal existence.
Legal Importance of Accurate Information
The IN01 form is not an administrative formality; it is a legal declaration. Incorrect or misleading information may lead to:
- Rejection of incorporation
- Removal from the register
- Criminal liability in cases of fraud or false statements
- Future compliance issues with filings and tax obligations
Directors have legal duties to ensure the accuracy of submitted information under UK company law.
Post-Incorporation Consequences
After incorporation, the information provided in the IN01 form becomes part of the public register and is used for:
- Credit checks
- Legal proceedings
- Regulatory compliance
- Banking and financial verification
Changes to company details must be reported to Companies House using the appropriate post-incorporation forms.
Practical Considerations
Before submitting the IN01 form, it is important to:
- Verify company name availability
- Confirm director eligibility
- Ensure share structure is correctly defined
- Prepare articles of association in advance
- Double-check all personal details for consistency
Careful preparation reduces the risk of delays and administrative complications.
Key Takeaways
The IN01 form is the core incorporation document required to register a company in the UK. It collects detailed legal, structural, and financial information, including company name, registered office, directors, shareholders, share capital, and governance arrangements. Accuracy is essential, as the information becomes part of the official public record maintained by Companies House. Errors can delay incorporation or lead to rejection, making careful completion a critical step in starting a company.
