VAT Invoices: The Basics
A VAT invoice is a specific type of invoice issued by a VAT-registered business in the UK. It serves two purposes: requesting payment (like any invoice) and documenting the VAT charged on the transaction so the buyer can reclaim it as an input tax credit.
If your business is VAT-registered, you are legally required to issue a VAT invoice to any VAT-registered customer who asks for one. The invoice is what allows them to reclaim the VAT on their own return — without it, they're stuck paying the tax with no credit.
The standard VAT rate is 20%. It applies to most goods and services. There are also reduced rates (5%) and zero-rated supplies (0%), plus exempt categories that fall outside the VAT system entirely.
Do You Need to Be VAT-Registered?
You must register for VAT when your taxable turnover exceeds £90,000 in any rolling 12-month period. This threshold was raised from £85,000 in April 2024.
You can also register voluntarily below the threshold. This makes sense if you sell primarily to VAT-registered businesses (they can reclaim the VAT, so it doesn't increase your effective price) and you want to reclaim VAT on your own purchases. It makes less sense if most of your clients are consumers — the 20% price increase may push them elsewhere.
Once registered, your obligations include: charging VAT on all taxable sales, issuing proper VAT invoices, filing quarterly VAT returns via MTD-compatible software, and keeping VAT records for at least 6 years.
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Thank you for your business. Payment is due within 30 days.
BACS bank transfer is the most common payment method.
What Must Appear on a Full VAT Invoice
HMRC specifies exactly what a full VAT invoice must contain. Missing any of these can invalidate the invoice for input tax credit purposes:
- A unique sequential invoice number — no gaps, no duplicates.
- Your business name, address, and VAT number (format: GB followed by 9 or 12 digits).
- The invoice date.
- The tax point (date of supply) — when the goods were delivered or the service performed. This can differ from the invoice date.
- Customer name and address.
- Description of goods or services supplied.
- Quantity of each item.
- Unit price excluding VAT.
- VAT rate for each item (20%, 5%, or 0%).
- Total excluding VAT.
- Total VAT charged.
- Total including VAT.
- Any discount rate applied.
The sample invoice below shows a properly formatted UK VAT invoice with all required fields.
Our UK freelance template and UK consulting template have these fields pre-configured.
Simplified VAT Invoices (Under £250)
For transactions under £250 including VAT, you can issue a simplified invoice. This is what most retail businesses use — the till receipt at a restaurant or shop is typically a simplified VAT invoice.
A simplified invoice needs: your name, address, and VAT number; the date of supply; a description of the goods or services; the total including VAT; and the VAT rate charged. You don't need the customer's details, the net amount, or a separate VAT calculation.
Simplified invoices are not valid for reverse charge transactions.
UK VAT Rates at a Glance
| Rate | Percentage | Applies To |
|---|---|---|
| Standard | 20% | Most goods and services (the default) |
| Reduced | 5% | Home energy, children's car seats, smoking cessation products, some mobility aids |
| Zero-rated | 0% | Most food (not restaurant meals), children's clothing, books, newspapers, public transport, prescribed medicines |
| Exempt | N/A | Financial services, education, health services, insurance, burial/cremation |
The distinction between zero-rated and exempt matters for your VAT return. Zero-rated supplies are technically taxable (at 0%), so you can still reclaim input VAT on associated costs. Exempt supplies are outside the VAT system entirely — you cannot reclaim input VAT on costs related to exempt supplies.
If you supply items at multiple VAT rates on the same invoice, show the subtotal and VAT for each rate separately. Most accounting software handles this automatically.
Common VAT Invoice Errors HMRC Flags
These are the mistakes that trigger questions during VAT inspections:
- Wrong VAT rate — charging 20% on a zero-rated or reduced-rate item, or vice versa.
- Incorrect tax point — using the invoice date when the goods were delivered on a different date.
- Gaps in invoice numbering — HMRC expects sequential numbers. Gaps suggest missing invoices, which triggers further investigation.
- No net/VAT/gross breakdown — all three must appear separately on a full VAT invoice.
- Rounding errors — VAT should be calculated per line or on the total, but be consistent. Small rounding differences across a year of invoices add up.
Use a template with built-in VAT calculations to eliminate most of these. Our invoice generator handles VAT arithmetic automatically.
Making Tax Digital and Record-Keeping
Since April 2019, most VAT-registered businesses must keep digital records and file returns through MTD-compatible software. Paper-only records are no longer acceptable.
You must retain all VAT records for at least 6 years. This includes: every VAT invoice you issue and receive, credit notes, debit notes, records of goods and services bought and sold, and your VAT account summary.
Practically, this means using accounting software (Xero, QuickBooks, FreeAgent, etc.) or at minimum maintaining well-organised digital files that your accountant can access. Shoeboxes of paper receipts won't cut it with HMRC.
Credit Notes: Correcting VAT Invoice Errors
If you issue an incorrect VAT invoice, don't just edit the original. Issue a credit note that references the original invoice number, then issue a corrected replacement invoice with a new number. HMRC requires a clear audit trail showing the correction.
A credit note must contain: the words "credit note," your name and VAT number, the customer's name, the date, a reference to the original invoice, the reason for the credit, and the VAT adjustment.