UK business email legal requirements for a limited company come from company law, and the short version is this: the rules we read say a company must show its registered name on its business correspondence and the full set of company details on business letters, order forms and websites. The passages we read do not use the word email. Whether your email counts as a business letter, and so falls under these UK business email legal requirements, is a judgement your adviser should make, so many companies put the details in the footer of every external email to be safe.
This is general information, not legal advice.
Everything below on UK business email legal requirements comes from official pages we opened on 4 October 2026: the GOV.UK guidance for limited companies, the Company, Limited Liability Partnership and Business (Names and Trading Disclosures) Regulations 2015 on legislation.gov.uk, and section 82 of the Companies Act 2006. We say what each page says and no more.
The short version
- The current UK business email legal requirements start from Part 6 of the 2015 regulations (S.I. 2015/17). The 2008 regulations many web pages still cite were revoked on 31 January 2015.
- Registered name: required on business letters and “all other forms of its business correspondence and documentation” (regulation 24).
- Registered number, registered office address and where the company is registered: required on business letters, order forms and websites (regulation 25).
- The regulations say a type of document includes its electronic form. They do not say email in the passages we read.
- If you want certainty for email, ask your accountant or company secretary, then put the details in a locked footer.
What the sources say about UK business email legal requirements
GOV.UK. The guidance page “Signs, stationery and promotional material” says: “You must include your company’s name on all company documents, publicity and letters.”
It then says that on business letters, order forms and websites you must show the company’s registered number, its registered office address, where the company is registered (England and Wales, Scotland or Northern Ireland), and the fact that it is a limited company, usually by spelling out the full name including “Limited” or “Ltd”. It adds that if you include directors’ names you must list all of them, and if you show share capital you must say how much is paid up.
It says different rules apply to invoices. The page’s metadata shows it was last modified on 29 January 2025. It does not mention email. You can read it on GOV.UK.
The regulations. The legislation sits in Part 6 of S.I. 2015/17, headed “Trading Disclosures”. The pages we opened showed no known outstanding effects. What matters for email:
- Regulation 24(1) says every company shall disclose its registered name on its “business letters, notices and other official publications”, on several other documents including invoices and order forms, and in (g) on “all other forms of its business correspondence and documentation”. Regulation 24(2) adds websites.
- Regulation 25 says every company shall disclose the “particulars” on its business letters, order forms and websites. The particulars are the part of the UK in which the company is registered, the registered number, the registered office address, and in specific cases the fact that it is a limited company, a community interest company that is not public, or an investment company.
- Regulation 26 says that where a company’s business letter includes the name of any director, “other than in the text or as a signatory”, the letter must disclose the name of every director.
- Regulation 29(c) says a reference to any type of document is a reference to a document of that type “in hard copy, electronic or any other form”.
- Regulation 20 says any display or disclosure required by the Part must be in characters that can be read with the naked eye.
The Act. Section 82 of the Companies Act 2006 lets the Secretary of State make regulations requiring companies, among other things, “to state specified information in specified descriptions of document or communication”, and says the regulations must in every case require disclosure of the company name. The page showed the section as up to date with changes in force at 3 October 2026.
A correction on UK business email legal requirements: the 2008 regulations are revoked
Many articles, and the brief for this one, cite the Companies (Trading Disclosures) Regulations 2008. On legislation.gov.uk, regulations 6, 7 and 11 of that instrument show as revoked on 31 January 2015 by S.I. 2015/17. We looked at those regulation pages on 4 October 2026 and the text is blank, with the revocation noted.
If you see the 2008 regulations quoted as current law, treat the page with caution. The 2015 regulations carry the same headings for the trading disclosures, so the shape of UK business email legal requirements is unchanged: registered name in communications, further particulars in business letters, order forms and websites, and disclosure of directors’ names.
A checklist of UK business email legal requirements
This table of UK business email legal requirements lists the details and the places each source says they are required. The last column is the honest gap.
| Detail | Source says it is required on | Does the source say “email”? |
|---|---|---|
| Registered company name | Business letters, notices, official publications, invoices, order forms, “all other forms of its business correspondence and documentation”, websites (regulation 24) | No |
| Part of the UK where registered | Business letters, order forms, websites (regulation 25) | No |
| Registered number | Business letters, order forms, websites (regulation 25) | No |
| Registered office address | Business letters, order forms, websites (regulation 25) | No |
| “Limited” status | Spelled out in the name; separate wording needed only for the exempt, community interest and investment company cases (regulation 25) | No |
| Names of every director | Only if a director is named on a business letter other than in the text or as a signatory (regulation 26) | No |
| Paid-up share capital | If share capital is shown on a business letter, order form or website, it must be paid up capital (regulation 25(3)) | No |
For this checklist of UK business email legal requirements, GOV.UK also says different rules apply to invoices, and points to its own invoice guidance, which we did not read.
Does an email count under the UK business email legal requirements?
Here the sources stop. We can say three things with confidence.
- Regulation 29(c) says a reference to a type of document includes its electronic form. So an electronic business letter is still a business letter.
- Regulation 24(1)(g) reaches “all other forms of its business correspondence and documentation” for the registered name. That is wide wording, and ordinary business email may fall within it, but we found no source that says so.
- Regulation 25 names business letters, order forms and websites. It does not name email, and none of the pages we opened says an email is a business letter.
What we cannot say about UK business email legal requirements is whether a regulator or a court would treat a particular email as a business letter. That is a question for your accountant, company secretary or solicitor. Because the cost of adding a short footer is small, many companies show the full details on every external business email. That is a choice, not a duty we found stated, and we are not claiming one.
Directors’ names are the trickiest part of UK business email legal requirements. Regulation 26 exempts a director named “in the text or as a signatory”. A director signing an email in the normal way is plausibly a signatory. A footer that lists “Directors: A, B” is different: the regulation says every director would need to be listed. If you are unsure, leave director names out of the footer.
A copyable footer for a limited company
Here is a footer you can adapt if you decide to show the details that UK business email legal requirements list for letters. The company name, number and address are made up. Replace them with the details on your Companies House record, and check the part of the UK matches.
Harbour Studio Limited is registered in England and Wales. Company number: 01234567. Registered office: 10 Example Street, London EC1A 1AA.
For a company registered in Scotland, change the first sentence to say Scotland, and for Northern Ireland, Northern Ireland. If the name does not include “Limited” or “Ltd”, check what applies to you, since regulation 25 has separate wording for exempt companies. Keep the type small and grey but readable; regulation 20 requires it to be readable with the naked eye. Here is how it looks in a signature drawn by the emailfooter engine:
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An executive layout with a company details footer. The company, number and person are made up.
What these sources do not cover
Several parts of UK business email legal requirements sit outside the pages we read:
- Sole traders and ordinary partnerships. The GOV.UK page is about limited companies. We did not read the rules for other business types.
- LLPs and overseas companies. The 2015 instrument has parts for these. We did not read them.
- Online service providers. A separate instrument, the Electronic Commerce (EC Directive) Regulations 2002, lists information a “service provider” must make easily accessible, such as its name, geographic address and registration number where applicable. We read regulation 6 but did not assess whether it applies to your business.
- Data protection and marketing email. The company-law pages above do not deal with personal data or marketing. See GDPR email disclaimers for the first, and ask about PECR for the second.
- Penalties. Regulation 28 says a company that fails, without reasonable excuse, to comply with a requirement in regulations 20 to 27 commits an offence, as does every officer in default, with a fine not exceeding level 3 on the standard scale and a daily default fine for continued contravention. We have not looked up the current amount of level 3.
Putting the UK business email legal requirements into every email
If you decide to show the details, make them impossible to forget. This is how to put UK business email legal requirements into practice without relying on memory.
- Use a locked footer. If the line depends on each person typing it, it will be missing on some messages. Our pillar guide to company email signatures covers the ways to do this, including the Google Workspace appended footer and the Microsoft 365 mail flow rule.
- Check the fields. See the pages on the registration number in a signature and the address in a signature.
- Test it. Send an email to an outside address and read the footer on a phone. Regulation 20 requires required disclosures to be readable with the naked eye, so if you have to squint, make the type bigger.
- Set a review date. If the registered office moves, the footer is out of date on every message until someone changes it.
- Keep other notices separate. Our email disclaimer examples have wording to discuss with a lawyer, and the United Kingdom page covers local signature details.
Whatever you decide about UK business email legal requirements, the footer only works if it is on every message. A tool such as emailfooter lets the company admin fix the legal footer once, and employees cannot edit it. It does not install anything in mailboxes for them.
Frequently asked questions
Do UK business email legal requirements say a company must put its registered number in every email?
Not in the passages we read. The regulations require the registered number on business letters, order forms and websites, and do not use the word email. Many companies show it in the footer anyway, to be safe. Ask your adviser about your case.
What are the UK business email legal requirements for a limited company?
The sources we opened say the registered name must be on business correspondence, and the registered number, registered office address and where the company is registered must be on business letters, order forms and websites. If you treat email as a business letter, show all of them.
Are the Companies (Trading Disclosures) Regulations 2008 still in force?
On legislation.gov.uk, the 2008 regulations we checked show as revoked on 31 January 2015 by S.I. 2015/17. The current rules are in Part 6 of the 2015 regulations.
Do UK business email legal requirements apply to a sole trader?
The GOV.UK page we read is about limited companies, and we did not read the rules for sole traders. Check GOV.UK’s guidance for your business type or ask an adviser.
Is a company email footer legal advice?
No. A footer is a statement of facts about your company. This article is general information, not legal advice, and it reflects pages we read on 4 October 2026.
Keep reading
- Company registration number in your email signature: where it is required: Company registration number in email signature: what UK, South African, Mauritian, OHADA and Nigerian sources say, which name email, and where we found none.
- Email disclaimer examples: 12 you can adapt, with notes on what each does: Twelve email disclaimer examples grouped by purpose, with length and what each is for, plus how to add one in Google Workspace or Microsoft 365.
- GDPR email disclaimer: do you need one? What the rules say: Is a GDPR email disclaimer required? What the UK GDPR text and ICO pages say about privacy information, business emails and footers, plus a sample line.
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