Invoicing in the UK: Legal Requirements & Templates

TL;DR: UK freelancers must include specific details on invoices to stay compliant and get paid. This includes your business name, address, invoice number, dates, client details, a clear description of services, and payment terms. Templates can help, but modern tools like Keepr make invoicing faster, easier, and more professional.

Contents

1. Why invoicing properly matters
2. Legal requirements for UK invoices
3. Invoice templates (pros and cons)
4. Best practices to get paid faster
5. Common invoicing mistakes to avoid
6. FAQs

Why invoicing properly matters

Your invoices aren’t just paperwork - they’re legally binding requests for payment. A missing detail can delay payments or even make your invoice invalid. Professional, accurate invoices also make you look more credible and help clients take your work seriously.

Legal requirements for UK invoices

HMRC requires invoices to include specific details:

• Your name (or business name) and address.
• Your client’s name and address.
• A unique invoice number (sequential).
• The invoice date and the supply date (if different).
• A clear description of the services or products provided.
• The amount charged, with a breakdown if needed.
• Payment terms (e.g., “Due within 14 days”).
• VAT details if you are VAT-registered (your VAT number, VAT rate, and amounts).

Not VAT registered? You must state “No VAT charged” or simply omit VAT fields.

Invoice templates (pros and cons)

• Pros: Quick to start, can be customised in Word/Excel/Google Docs.
• Cons: Easy to lose track, manual edits cause errors, time-consuming for repeat clients, and harder to stay consistent.

Better alternative: Use invoicing software like Keepr. You get professional invoices, automatic numbering, and built-in payment tracking.

Best practices to get paid faster

• Set clear payment terms: 7–14 days is common for freelancers.
• Use sequential invoice numbers: helps with record-keeping and compliance.
• Add payment methods: bank transfer details, or integrate online payment options if possible.
• Follow up: send polite reminders before and after due dates.
• Be consistent: use the same design and layout for professionalism.

Common invoicing mistakes to avoid

• Not numbering invoices sequentially.
• Forgetting supply dates (required for compliance).
• Sending vague descriptions (“services rendered”).
• Leaving out payment terms - leading to long waits.
• Mixing personal and business bank accounts.

FAQs

Can I invoice without being VAT registered?

Yes. You can still invoice clients - just don’t add VAT unless you’re registered. Include a note like “No VAT charged.”

Do I need to include my UTR number?

No. UTR numbers are for tax filings with HMRC, not for client invoices. Stick to the required invoice details.

What’s the easiest way to make sure my invoices are compliant?

Use invoicing software like Keepr, which automatically includes all the required fields and saves time compared to manual templates.