Find out how your business structure changes the way you must format your UK invoices.

Your Business Structure Determines Invoice Format

Whether you operate as a sole trader (self-employed) or a limited company fundamentally changes what must appear on your invoices. Getting this wrong doesn't just look unprofessional — it breaches UK law.

Sole Trader Invoices

A sole trader is an individual running a business. You are the business. No separate legal entity.

What Must Be on a Sole Trader Invoice:

Your full name (or trading name, if different)
Your business address
Your email and phone
Your UTR (Unique Taxpayer Reference) — a 10-digit number HMRC gives you when you register as self-employed
Unique, sequential invoice number
Invoice date
Client name and address
Description of services
Amount in GBP

What NOT to Include (Critical):

❌ Company Registration Number — You don't have one. Sole traders aren't registered at Companies House.
❌ "Ltd" or "Limited" — Illegal if you're not a limited company. HMRC can penalise you.
❌ VAT number (unless you voluntarily registered for VAT above £90,000 turnover)

Example: A Sole Trader Invoice

INVOICE

John Murphy
Trading as: Murphy Plumbing
42 Oak Lane
Bristol, BS1 5HA
Email: john@murphyplumbing.co.uk
Phone: 0117 946 1234
UTR: 1234567890

Invoice Number: JM-0056
Date: 10 May 2026
Due: 24 May 2026 (Net 14)

To: ABC Property Management Ltd
100 Queen Street, Bristol, BS1 2AB

Description: Emergency call-out and boiler repair
- Callout charge (after hours): £85
- Materials (new thermostat): £120
- Labour (3 hours @ £45/hr): £135
Total: £340

Bank: Lloyds
Sort: 30-96-22
Account: 11223344

Limited Company Invoices

A limited company is a separate legal entity from you, the owner. It's registered at Companies House. This gives you limited liability — your personal assets are protected if the company fails.

What MUST Be on a Limited Company Invoice (Legal Requirement):

Company name (exactly as registered at Companies House)
Company registration number (starts with 0, typically 8 digits)
Registered office address
Unique, sequential invoice number
Invoice date
Client name and address
Description of goods/services
Amount due in GBP
VAT number (if registered)

Critical: The "Ltd" Suffix

Your company name on invoices must match exactly how it's registered at Companies House. If registered as "John Smith Design Ltd", you invoice as "John Smith Design Ltd", not "John Smith Design" or "JSDC Ltd".

Company Registration Number (CRN)

This is a legal requirement for limited companies. Clients use it to verify you exist and are legitimate. You'll find it:

In your Certificate of Incorporation (document sent when you registered)
On Companies House website (search free at companieshouse.gov.uk)
On your business bank statements

Example: A Limited Company Invoice

INVOICE

Smith Design Ltd
Company Registration Number: 12345678
Registered Office:
123 Design House
Manchester, M1 3HN
Email: hello@smithdesign.co.uk
Phone: 0161 946 5234
VAT Registration: GB 999 8888 77

Invoice Number: SD-0089
Date: 12 May 2026
Due: 26 May 2026 (Net 14)

To: Marketing Agency UK Ltd
45 Queen's Road
London, N1 3AB

Description: Brand identity design package
- Logo design (3 concepts): £1,200
- Brand guidelines document: £400
- Social media template kit: £300
Subtotal: £1,900
VAT @ 20%: £380
Total: £2,280

Bank: Barclays
Sort: 20-30-40
Account: 12345678

Side-by-Side Comparison

Aspect	Sole Trader	Limited Company
Business name on invoice	Your personal name (or trading name)	Registered company name + Ltd suffix
Registration number	UTR (10 digits)	Company Reg Number (8 digits, starts with 0-9)
Where registered	HMRC Self Employment	Companies House
Must include on invoice	UTR	Company Reg Number (MANDATORY)
Registered office address	Your business address	Your registered office address (must be in UK)
VAT number	Only if VAT registered (above £90k)	If VAT registered
Tax complexity	Self Assessment (simpler)	Corporation Tax return (more complex)
Liability	Personal (you're liable for debts)	Limited (company liable, not you personally)

Trading As a Different Name (Sole Traders)

You can trade under a name different from your legal name. For example, your legal name is Sarah Johnson, but you trade as "Creative Copy Studio".

On your invoice, show both:

Creative Copy Studio
(Trading as: Sarah Johnson)
Address: ...
UTR: ...

This helps clients identify you, while HMRC knows your real name.

What If You Get It Wrong?

If a sole trader invoices with "Ltd" or a limited company fails to show its registration number:

Clients may refuse payment (suspicious invoice)
HMRC may query it during an inspection
It looks unprofessional and loses you business
Customers may struggle to reclaim VAT (if you're VAT registered)

Switching from Sole Trader to Limited Company

If you start as a sole trader and later incorporate as a limited company:

Register your limited company at Companies House (costs £12 online)
Stop trading under your personal name
Start invoicing under your new company name and registration number
Update your website, email, stationery, everything
Notify existing clients of the change

From that point, all new invoices are issued by the limited company, not by you personally.

Create Compliant Invoices Automatically

InvoiceForged asks whether you're a sole trader or limited company, then pre-fills the correct fields on your invoice template. Your UTR or company registration number is displayed correctly every time. No more guessing or risking compliance errors. Start free — 3 invoices per week.

FAQ

Can a sole trader have a limited company invoice?

No. If you're a sole trader, you cannot use a company registration number or the "Ltd" suffix. It's illegal.

What if I trade under a different name as a sole trader?

Show your legal name and trading name on the invoice (see example above).

Can my limited company have no registered office?

No. Companies House requires a UK address. It can be your home, office, or an accountant's address, but it must be a physical UK location.

Do I need a company registration number on handwritten invoices?

Yes, if you're a limited company. Every invoice must legally include it.

Sole Trader vs. Limited Company Invoices: Key Differences