HMRC UK VAT Invoice Requirements: Complete Guide for 2026

If your UK business or sole proprietorship is registered for Value Added Tax (VAT) with HM Revenue and Customs (HMRC), every invoice you issue to VAT-registered customers must comply with stringent legal standards. Issuing an invalid invoice can cause HMRC penalties, delay payments, and prevent your commercial clients from reclaiming their input VAT.

In this guide, we review the 10 mandatory fields under HMRC regulations, the £90,000 VAT registration threshold, and how to create free HMRC-compliant VAT invoices online.

What is a Valid HMRC VAT Invoice?

Under UK VAT law, a tax invoice must be issued within 30 days of the “tax point” (the time of supply) whenever goods or services are supplied to another VAT-registered business.

HMRC recognizes three formats of VAT invoices:

1. Full VAT Invoice: Standard format required for all B2B transactions.
2. Simplified VAT Invoice: Permitted for retail transactions under £250 including VAT.
3. Modified VAT Invoice: For retail transactions exceeding £250 where the customer agrees.

10 Mandatory Particulars for a Full UK VAT Invoice

According to HMRC Notice 700, every full VAT invoice must display:

1. Sequential Invoice Number: A unique, unbroken numerical or alphanumeric code that follows a continuous series.
2. Time of Supply (Tax Point): The date the service was completed or goods dispatched (if different from the invoice issue date).
3. Date of Issue: The calendar date on which the invoice is generated.
4. Supplier Name & Registered Address: Your legal name, trading name, and official business address.
5. Customer Name & Address: The client’s legal entity name and trading premises.
6. 9-Digit UK VAT Registration Number: Prefixed by GB (e.g., GB 123 4567 89).
7. Description of Deliverables: Clear itemization showing quantity, type of goods, or extent of services provided.
8. Unit Price & Net Value: The cost per unit and total amount payable excluding VAT, quoted in GBP (£).
9. Rate of VAT Charged: The applicable rate (Standard 20%, Reduced 5%, or Zero-rated 0%).
10. Total VAT Amount Payable: Expressed in Sterling (£) alongside the gross total due.

UK VAT Thresholds for 2026

• Compulsory Registration Threshold: £90,000 rolling 12-month taxable turnover. If your gross taxable sales exceed £90,000 in any consecutive 12-month window, you must register for VAT within 30 days.
• Deregistration Threshold: £88,000. If your taxable turnover falls below £88,000, you may apply to deregister.
• Making Tax Digital (MTD): All VAT-registered businesses in the UK, regardless of turnover size, must keep digital records and submit returns using MTD-compatible software or bridged digital links.

Late Payment of Commercial Debts Act

UK businesses and freelancers are legally shielded by the Late Payment of Commercial Debts (Interest) Act 1998. If a corporate client fails to pay your invoice within your agreed terms (or the statutory default of 30 days):

• You have the statutory right to charge 8% plus the Bank of England base rate in daily interest.
• You can claim fixed compensation costs for debt recovery:
  • Debt under £1,000: £40
  • Debt between £1,000 and £9,999: £70
  • Debt of £10,000 or more: £100

Create Your Free HMRC UK VAT Invoice

Generate fully compliant UK VAT invoices with automatic 20% VAT calculations, Faster Payments bank fields (Sort Code & Account Number), and instant PDF export on our Free UK Invoice Generator.