How to Create a Valid VAT Invoice

The Difference Between a Standard and VAT Invoice

If you're VAT registered (turnover above £90,000), your invoices are legally different from those of unregistered businesses. You must show VAT separately, and your customer can reclaim it. Get any field wrong and they'll lose money — and likely lose you their business.

The 8 Essential Fields on a VAT Invoice

• Your VAT registration number — Must start with GB and be your full VRN
• Your business name and address — Registered office address
• Customer name and address — Full details
• Invoice number (unique, sequential) — Never skip or reuse
• Invoice date — The date you issue it
• Tax point date — When the supply was made (usually same as invoice date)
• Description of goods/services — Specific, not vague
• VAT breakdown — Amount before VAT, VAT rate, VAT amount, total after VAT

Example: A Proper VAT Invoice

Let's say Sarah, a web designer in London, invoices ABC Marketing for website work.

INVOICE
From: Sarah Thompson Design Ltd
Unit 5, Design House
London, EC1A 1BB
VAT Registration: GB 123 4567 89

To: ABC Marketing Agency
45 Queen's Road
Manchester, M1 2AB

Invoice Number: WD-0047
Date: 15 May 2026
Tax Point: 15 May 2026

Service Description        Quantity  Unit Price   Amount
Homepage redesign          1         £2,000       £2,000
Revision rounds (3 incl.)  included  included     included
Logo refresh               1         £500         £500
─────────────────────────────────────────────────────
Subtotal (excl. VAT)                              £2,500
VAT @ 20%                                         £500
TOTAL (incl. VAT)                                 £3,000

Payment Terms: Net 30
Bank: Barclays | Sort: 20-30-40 | Account: 12345678

The Three VAT Rates You Must Know

• Standard (20%) — Most goods and services
• Reduced (5%) — Energy bills, certain mobility aids, some renovations
• Zero (0%) — Books, newspapers, food (not alcohol), children's clothing, public transport fares

Using the wrong rate means your customer pays wrong VAT to HMRC and you'll have to issue a credit note. Get it right the first time.

Simplified vs Full VAT Invoices

For sales under £250, you can issue a simplified invoice that skips the customer's full address. But if they request a full invoice, you must provide one. For amounts over £250, always use a full invoice format shown above.

Common Mistakes That Get You Audited

• Not showing your VRN — HMRC requirement. Without it, customer can't reclaim VAT.
• VAT not shown separately — Must be on its own line, never bundled into the price.
• Wrong VAT rate applied — Claiming 20% on zero-rated items means penalties.
• Missing invoice number or sequence gaps — HMRC flags these as suspicious.
• Tax point date missing or wrong — The supply date matters for VAT accounting.
• Invoice date more than 30 days after supply — Invalid for VAT purposes.

What If Your Customer is Also VAT Registered?

They can reclaim the VAT you charge. So a £3,000 invoice with £500 VAT means they only pay £2,500 (assuming they're VAT registered). This is why getting the VAT amount exactly right is critical.

What If Your Customer is Outside the UK?

If selling goods to an EU or non-EU country, VAT rules change. Generally, you don't charge UK VAT; instead, you might be liable for VAT in their country. If selling services to an EU business, reverse charge applies (they pay their own country's VAT, not UK VAT). This is complex — verify on gov.uk VAT for exports before invoicing.

Electronic VAT Invoices Are Valid

PDF invoices sent via email are fully compliant. You must keep them for 6 years, and be able to authenticate that they came from you. Digital signatures add extra protection.

When a VAT Invoice Is Invalid

If any of these are missing, it's not a valid VAT invoice and your customer loses their right to reclaim VAT:

• Your VAT number
• Invoice number
• Invoice date or tax point date
• VAT amount shown separately
• Your business address
• Customer name and address

Create Valid VAT Invoices Instantly

Manual VAT calculation and formatting is tedious and error-prone. InvoiceForged handles all VAT rates (20%, 5%, 0%) automatically and displays everything in the correct format. No more spreadsheet disasters. Start free today — 3 invoices per week, no credit card.

FAQ

Can I handwrite a VAT invoice?

Technically yes, but HMRC prefers digital records you can authenticate. A handwritten invoice is risky if audited.

What if I issued a VAT invoice on the wrong date?

Issue a credit note for the original, then create a new invoice with the correct date and next sequential number.

Do I need a PO (purchase order) number on a VAT invoice?

Only if the customer provided one. But it's good practice to include it if they did — makes payment tracking easier for them.

Can I invoice monthly for a retainer?

Yes. Show the month (e.g., "May 2026 retainer"), the amount, and VAT. Each month gets its own sequential invoice number.