What Is a VAT Invoice, and Who Needs to Issue One?
A VAT invoice is a specific type of invoice issued by a VAT-registered business that itemizes the VAT charged on a sale, alongside the standard billing details. It's not optional paperwork — HMRC and EU tax authorities both require it as the primary evidence a business uses to reclaim input VAT and to report output VAT correctly on a return.
If you're VAT registered — in the UK or in any EU member state — you're legally required to issue a compliant VAT invoice for every taxable sale to another VAT-registered business, and in most cases for consumer sales too. If you're not VAT registered, the rules flip: you cannot show VAT on your invoice at all, even if you wanted to.
UK VAT Rates & Registration Threshold
The UK operates three VAT rates:
- Standard rate — 20%: applies to most goods and services.
- Reduced rate — 5%: applies to a specific list of goods and services, such as home energy and children's car seats.
- Zero rate — 0%: applies to items like most food, books, and children's clothing. Zero-rated supplies are still VAT-taxable, they're just charged at 0% — which is different from being exempt.
Businesses must register for VAT once their taxable turnover crosses the VAT registration threshold — £90,000 in the most recent update at the time of writing. Thresholds are revised periodically, so always confirm the current figure on gov.uk before making a registration decision.
It's worth being precise about one distinction that trips people up constantly: zero-rated and exempt are not the same thing. Zero-rated sales still count toward your VAT-taxable turnover and you can reclaim VAT on related costs. Exempt sales don't count toward the threshold at all, and you generally can't reclaim input VAT against them.
The Mandatory Elements of a Compliant VAT Invoice
Both HMRC and EU VAT law require the same core set of elements on a full VAT invoice:
- A unique, sequential invoice number
- The supplier's business name, address, and VAT registration number
- The customer's name and address (and VAT number, for B2B and reverse-charge transactions)
- The invoice date and the tax point (time of supply) — see below
- A clear description of the goods or services supplied
- The quantity and unit price of each line item
- The VAT rate applied to each line, shown per line if rates differ across the invoice
- The total VAT charged, broken out by rate if more than one rate is used
- The gross total payable
Miss any of these and the invoice can be rejected as evidence for input VAT recovery — which is a real, recurring cause of friction between suppliers and accounts-payable teams.
Issue Date vs. Tax Point (Time of Supply)
These are two different dates, and conflating them is one of the most common invoicing mistakes. The issue date is simply when you create and send the invoice. The tax point — also called the time of supply — is the date that determines which VAT period the transaction falls into, and which VAT rate applies if rates change between the two dates. For most transactions, the tax point is whichever happens first: the date goods are delivered or services completed, or the date payment is received, unless a VAT invoice is issued within 14 days of that, in which case the invoice date becomes the tax point instead.
The Reverse Charge Mechanism, Explained
The reverse charge exists to simplify VAT collection on cross-border B2B trade. Instead of the supplier charging VAT in their own country and the customer trying to reclaim it in theirs, the obligation to account for VAT shifts entirely to the customer, in the customer's own country, at their own local rate.
This applies most commonly to intra-EU B2B services between VAT-registered businesses in two different member states. When it applies:
- The supplier charges 0% VAT on the invoice — not because the sale is exempt or zero-rated, but because the liability has moved to the customer.
- The invoice must state the mandatory legal clause identifying that the reverse charge applies, referencing Article 196 of EU Directive 2006/112/EC.
- The customer accounts for VAT on their own return, at their local rate, as both the notional "output" and "input" VAT — which nets to zero for a fully-taxable business but keeps the paper trail intact for the tax authority.
The UK has its own domestic reverse charge in specific sectors too — most notably the Construction Industry Scheme (CIS) reverse charge for certain building and construction services between VAT-registered contractors and subcontractors. The underlying mechanism is the same: 0% VAT on the invoice, liability shifted to the customer, and a clause stating that the reverse charge applies.
Invoicing When You're Not VAT Registered
If your business isn't VAT registered — because you're below the threshold or you've chosen not to register — your invoices need to look different, not just have a "0%" typed into a VAT field:
- Do not include a VAT registration number field at all.
- Do not show a VAT rate or VAT amount on any line.
- State clearly on the invoice that no VAT has been charged, so the customer isn't left guessing whether VAT was simply forgotten.
This matters because a customer who receives an invoice with no VAT shown and no explanation may (reasonably) query it, or worse, assume they can reclaim VAT that was never actually charged.
Multi-Currency VAT Invoices
Cross-border trade means invoicing in a currency that isn't your home currency. This is administratively fine — VAT law doesn't require invoices to be in a specific currency — but the VAT amount itself typically still needs to be reportable in your home currency for your own VAT return, using an appropriate exchange rate on the tax point date. If you regularly invoice in EUR, USD, AUD, or AED while VAT-registered in the UK or EU, keep a record of the exchange rate used at the time of supply, not just the invoice date, in case they differ.
Digital Record-Keeping & Making Tax Digital
UK VAT-registered businesses are required to keep digital VAT records and submit VAT returns through Making Tax Digital (MTD) compatible software. A correctly structured VAT invoice — with the tax point, VAT rate, and VAT amount clearly itemized — is exactly what feeds cleanly into that digital record, which is one more reason to get the invoice format right at the point of issue rather than reconstructing it later.
Comprehensive FAQ
What must a VAT invoice legally include?
A unique sequential invoice number, the supplier's name, address and VAT registration number, the customer's name and address, the invoice date and tax point (time of supply), a description of the goods or services, the quantity and unit price, the VAT rate applied to each line, the total VAT charged, and the gross total payable.
What is the reverse charge and when does it apply?
The reverse charge shifts the responsibility for accounting for VAT from the supplier to the customer. It typically applies to cross-border B2B services between VAT-registered businesses in different EU member states, and to certain UK domestic transactions such as construction services under the CIS reverse charge.
Do I need to charge VAT if I am not VAT registered?
No. If you are not VAT registered, you cannot charge or show VAT on your invoices at all. Your invoice should state clearly that no VAT has been charged, and you should not include a VAT registration number field.
What is the difference between the issue date and the tax point?
The issue date is when the invoice document is created and sent. The tax point (or time of supply) is the date that determines which VAT period and VAT rate applies — usually the date goods are delivered or services are completed, which can differ from the invoice date.
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About the Author
Author & Economics Researcher — Economics Honors, Bhattadev University · GetInvoicePDF.com
Santanu Sarma is an economics researcher specializing in public finance and econometrics, holding an Economics Honors from Bhattadev University. He builds high-precision financial tools and calculators to help freelancers, agencies, and small businesses stay compliant with tax and invoicing requirements at GetInvoicePDF.com.
Disclaimer: This tool and article are provided for informational purposes only and do not constitute tax or legal advice. VAT rates, thresholds, and rules change and vary by jurisdiction — always confirm current requirements with HMRC, your local tax authority, or a qualified accountant before relying on any invoice for a VAT return.