VAT Invoice Requirements at a Glance
If your business is VAT registered, every taxable supply you make must be accompanied by a VAT invoice. Getting this right is important: incorrect or missing VAT invoices mean your customer cannot reclaim the VAT, and HMRC may deny your own input tax claims.
Who Needs to Issue VAT Invoices?
Any VAT-registered business making a taxable supply to another VAT-registered business must issue a VAT invoice. You must also issue one if a VAT-registered customer requests one.
You do not need to issue a VAT invoice for:
- Supplies to non-VAT-registered consumers (though you may choose to)
- Zero-rated supplies (though a VAT invoice can still be useful)
- Exempt supplies
Full VAT Invoice: All Required Fields
A full VAT invoice must include:
- The word "invoice" displayed clearly
- A unique sequential invoice number
- Your business name and address
- Your VAT registration number (format: GB followed by 9 digits)
- The invoice date
- The tax point (usually the invoice date; may differ for continuous supplies)
- Your customer's name and address
- Description of the goods or services supplied
- For each item: quantity, unit price, net amount, and applicable VAT rate
- Total net amount (before VAT)
- Total VAT amount
- Total gross amount (including VAT)
- VAT rate applied — if multiple rates are used (e.g., standard 20% and zero-rated), show each rate and the corresponding VAT amount separately
Simplified VAT Invoice
For supplies where the total (including VAT) is £250 or less, you may issue a simplified VAT invoice. This requires fewer fields:
- Your business name and address
- Your VAT registration number
- The date of supply (tax point)
- Description of goods or services
- The applicable VAT rate
- The total amount including VAT
Customers cannot reclaim VAT using a simplified invoice unless it shows the net amount separately — so for B2B supplies, a full invoice is usually preferable even under £250.
Modified VAT Invoices
A modified VAT invoice can be used for retail supplies over £250. It is similar to a full VAT invoice but shows VAT-inclusive prices rather than net prices, as long as the VAT amount is still identifiable.
Tax Point Rules
The tax point determines which VAT period a supply belongs to. For most businesses:
- Basic tax point: the date goods are delivered or services are performed
- Actual tax point: if you issue an invoice before or after the basic tax point, the invoice date becomes the actual tax point (within certain limits — generally within 14 days before or after the basic tax point for early or late invoices)
For continuous supplies (e.g., monthly retainer services), the tax point is typically the invoice date or the end of the billing period.
VAT Rates: Which Applies?
| Rate | Applies To |
|---|---|
| 20% Standard | Most goods and services |
| 5% Reduced | Domestic energy, children's car seats, renovation of certain residential properties |
| 0% Zero | Food (most), children's clothing, books, newspapers, new residential buildings |
| Exempt | Financial services, insurance, some education — no VAT charged, no reclaim on inputs |
Always check HMRC's guidance for specific supplies — VAT classification can be complex.
Common VAT Invoice Mistakes
Missing VAT Registration Number
Without your VAT number on the invoice, your customer cannot reclaim the input tax. Always include it.
Wrong Tax Point
Using the invoice date when the correct tax point is the delivery date (or vice versa) can result in VAT being reported in the wrong period. For most service businesses this is rarely significant, but it matters for month-end timing.
Not Separating Net and VAT
Some businesses show only the total inclusive amount without breaking out the net and VAT components. This is insufficient for a full VAT invoice.
VAT on Exempt Supplies
Charging VAT on exempt supplies is incorrect. For example, if you provide financial advice, this is exempt from VAT — you should not charge VAT even if you are VAT registered.
Issuing Credit Notes for VAT
If you need to reduce or cancel a VAT invoice (e.g., due to a return or dispute), issue a VAT credit note. This must reference the original invoice number and show the negative amounts being credited.
Both your original invoice and the credit note must be reported in your VAT return. If you have already reported the VAT on the original invoice, the credit note reduces your output tax.
Record Keeping
Keep all VAT invoices (both issued and received) for 6 years. HMRC can inspect these during a VAT enquiry. Digital records are acceptable.
Under Making Tax Digital (MTD), all VAT-registered businesses must keep digital records and submit VAT returns through MTD-compatible software.
FlashBill for VAT Invoicing
FlashBill automatically generates compliant VAT invoices, including all mandatory fields. Set your VAT rate per client, and every invoice is formatted correctly with the net, VAT, and gross amounts clearly shown.