# OS IN01: registering a UK establishment of an overseas company - **Canonical URL:** https://formspedia.com/uk/os-in01/ - **Country & Language:** United Kingdom (`en-GB`) - **Form:** OS IN01 - **Revision:** Version 10.0 (February 2026) - **Issuing Agency:** Companies House - **Tax Area:** Registration, representation and benefits - **Who Must File:** Overseas companies opening a UK establishment (branch or place of business) - **Filing Method:** Paper application by post to Companies House with certified constitutional documents - **Filing Deadline:** Within 1 month of opening the UK establishment - **Filing Fee:** £124 - **Legal Basis / Statute:** Companies Act 2006, section 1046; Overseas Companies Regulations 2009, regulation 4(1) - **Official Form PDF:** https://assets.publishing.service.gov.uk/media/69135e462017198896ad7fdc/OS_IN01_v9.0-FINAL.pdf A company incorporated outside the UK that opens an office, branch or other place of business here has one month to register that UK establishment with Companies House. On paper, that means form OS IN01, a fee of £124, and a bundle of certified documents from the home country. OS IN01 registers a new establishment only; changes to a company, officer or establishment already on the register need other forms. The version in use, 10.0 of February 2026, is made under section 1046 of the Companies Act 2006 and regulation 4(1) of the Overseas Companies Regulations 2009. ### Does the company actually have a UK establishment? Companies House defines a UK establishment as a place of business or branch of an overseas company in the UK. Some physical presence is the test. Its guidance gives two examples of what does not count: an independent agent doing business for the company, and an occasional location such as a hotel where a director works during visits. ### What goes in the envelope - The completed OS IN01 and the £124 fee, by cheque or postal order payable to "Companies House". Companies House rejects the application if the fee is wrong. - A certified copy of the constitution (charter, statute, or memorandum and articles), with a certified English translation if it is in another language. - If the company must prepare, audit and disclose accounts under its home law, a copy of the latest accounts disclosed as at the opening date, again with a certified translation where needed. - If the name contains a sensitive word, a copy of the reply from the body you consulted. A certified translation must be authenticated by a director or secretary, a permanent representative, an administrator, administrative receiver, receiver manager, receiver, liquidator or judicial factor. The person certifying signs at the end of the translation. ### Part by part **Part 1, name** The corporate name exactly as registered at home, which must match the constitutional documents letter for letter. If the company will trade in the UK under a different name, give it in A2. Under section 1048, once registered that alternative name is treated as the corporate name for UK law. **Part 2, the company abroad** Whether it is a credit or financial institution, the country of incorporation, the register it is on and its number there, its legal form (limited or not, private or public), the governing law, and whether home law requires it to prepare, audit and disclose accounts. If it does, give the accounting period and the months allowed for preparing and disclosing the accounts. If the company already has another UK establishment, enter that registration number in B1 and jump to Part 5. **Part 3, constitution** Tick that the certified copy is enclosed. If it does not show the principal office address abroad, the objects of the company or the issued share capital, fill those in at C3. **Part 4, officers** Every secretary and director, individual or corporate, with the extent of their authority (limited or unlimited) and whether they can act alone or only jointly. Individual directors must have verified their identity under section 1110A of the Companies Act 2006, and their 11-character Companies House personal code goes on page 9, which is not shown on the public record. **Part 5, the UK establishment** Its name, address, the date it opened and the business carried on there. You also choose whether the company will meet its accounting requirements through this establishment or another UK one. **Part 6, permanent representatives** Everyone authorised to represent the company for this establishment, with their authority, a service address and a usual residential address. A representative who has applied for or holds higher protection under regulation 25 posts the whole form to PO Box 4082, Cardiff, CF14 3WE. **Part 7, accepting service** Anyone in the UK authorised to accept legal documents for the company, or a tick to say there is no one. **Part 8, authentication** A director, secretary or permanent representative types their name. No signature. ### Directors' identity: a second form Companies House guidance says an overseas company also files form OS VS01 to confirm all its directors have verified their identity, unless it has already given that information. One OS VS01 covers all the directors, with continuation pages beyond two. ### Sending it and what follows Post it to the address Companies House lists on its offices page. Residential addresses, the day of birth and identity verification details stay off the register; the rest of the form is published. Registration starts other duties. Changes to the overseas company must be notified within 21 days after the date the notice of the change could have been received by post in the UK. A company that must disclose accounts under its home law delivers them within 3 months of the date they must be disclosed there. The GOV.UK guidance lists the fees for accounts and charges as well. ### Official sources - Companies House, OS IN01 Registration of an overseas company opening a UK establishment, version 10.0, 02/26 ([assets.publishing.service.gov.uk](https://assets.publishing.service.gov.uk/media/69135e462017198896ad7fdc/OS_IN01_v9.0-FINAL.pdf)) - GOV.UK, Register a UK establishment of an overseas company (OS IN01), last updated 16 February 2026 ([gov.uk](https://www.gov.uk/government/publications/register-a-uk-establishment-of-an-overseas-company-os-in01)) - Companies House, Overseas companies registered in the UK ([gov.uk](https://www.gov.uk/government/publications/overseas-companies-in-the-uk-registration-filing-and-disclosure-obligations/overseas-companies-registered-in-the-uk))