VAT invoices are legal documents that show the VAT charged on a transaction. As a VAT-registered business, you must issue VAT invoices for most sales to other VAT-registered businesses. Your customers need these invoices to reclaim the VAT they have paid as input tax.

Getting your invoices right is essential. Missing information or incorrect details can prevent your customers from reclaiming VAT, and may result in penalties for your business during HMRC inspections.

This guide explains the different types of VAT invoice, what information each must contain, and the rules for issuing, storing, and retaining them.

When you must issue a VAT invoice

You must issue a VAT invoice when you make a taxable supply to another VAT-registered business. This includes sales of goods and services at the standard rate (20%), reduced rate (5%), or zero rate (0%).

You are not required to issue a VAT invoice when:

Making exempt supplies (such as insurance, education, or healthcare)
Selling to customers who are not VAT-registered (though you may choose to do so)
Making supplies within a VAT group (between companies in the same VAT registration)

Even when not legally required, maintaining consistent invoicing practices helps with your record-keeping and VAT return preparation.

When VAT invoices are not required

Circumstances where VAT invoices do not need to be issued.

Exempt supplies: No VAT invoice required for VAT-exempt supplies (e.g., insurance, education, health)
Sales to non-VAT registered customers: No obligation to issue VAT invoice (but may choose to do so)
Zero-rated supplies: VAT invoice still required for zero-rated supplies to VAT-registered businesses
Retail sales: Simplified invoice acceptable for retail sales up to £250
Supplies within a VAT group: No VAT invoice required for supplies between members of the same VAT group

Even where not legally required, keeping detailed records of all sales is recommended for VAT return preparation and HMRC enquiries. Businesses must still maintain sufficient records to support their VAT returns.

Time limits for issuing VAT invoices

You must issue a VAT invoice within 30 days of the date of supply (the tax point). Issuing invoices late can result in penalties and may affect when VAT is accounted for on your returns.

VAT invoice time limits

Statutory deadlines for issuing VAT invoices and tax point rules.

Standard deadline: Within 30 days of the tax point (date of supply)
Tax point - goods: Date goods are delivered or made available to customer
Tax point - services: Date services are completed
Invoice issued before supply: Tax point is the invoice date if invoice issued before goods delivered or services completed
Payment received before supply: Tax point is the date payment received if before goods delivered or services completed
14-day rule (goods removed): If goods removed before invoice, tax point is date of removal unless invoice issued within 14 days
Continuous supplies: Tax point is the earlier of invoice date or payment date

VAT return implications

The tax point determines which VAT return period the supply falls into. If you issue an invoice within 30 days of the basic tax point, the invoice date becomes the tax point. This can help manage when VAT becomes due.

Penalty for late invoicing

Failure to issue VAT invoices or issuing them late can result in penalties. HMRC may also assess additional VAT if invoices are not issued correctly.

Why tax points matter for invoicing: The tax point determines which VAT return period your sale belongs to. If you issue an invoice within 14 days after the basic tax point (delivery or completion), the invoice date becomes the actual tax point. This gives you some flexibility in managing when VAT becomes due.

For advance payments and deposits, issue an invoice within 30 days of receiving the payment. Each payment creates its own tax point.

Types of VAT invoice

There are three types of VAT invoice, each with different requirements depending on the value of the supply and how prices are displayed:

Full VAT invoice - Required for supplies over £250 to VAT-registered customers
Simplified VAT invoice - Allowed for supplies of £250 or less (including VAT)
Modified VAT invoice - Used when showing VAT-inclusive prices on supplies over £250

Full VAT invoice requirements

A full VAT invoice is required for sales over £250 (including VAT) to VAT-registered customers. It must contain 14 mandatory items to be valid for input tax recovery.

Full VAT invoice - 14 mandatory items

The 14 items that must appear on a full VAT invoice for supplies over £250.

1. Unique invoice number: Sequential number that follows on from the last invoice (no gaps or duplicates)
2. Supplier's name: Trading name or registered company name
3. Supplier's address: Full business address
4. Supplier's VAT registration number: 9-digit GB VAT number (format GB 123 4567 89)
5. Customer's name: Name of business or individual receiving the supply
6. Customer's address: Full address of the customer
7. Invoice date: Date the invoice is issued
8. Date of supply (tax point): Date goods were delivered or services completed (if different from invoice date)
9. Description of goods or services: Sufficient detail to identify what was supplied
10. Quantity of goods or extent of services: Number of items, hours worked, or other measurement
11. Unit price excluding VAT: Price per unit before VAT is added
12. Rate of VAT per item: Standard (20%), reduced (5%), or zero (0%) rate applicable to each item
13. Total amount excluding VAT: Net total before VAT
14. Total amount of VAT: VAT charged at each rate, shown separately

Additional requirements

Rate of discount - if applicable, show any cash or quantity discount offered
Total including VAT - recommended but not legally required
Currency - if not in sterling, also show VAT amount in sterling

Practical tips for full invoices:

Use invoicing software or a template that includes all 14 fields
Ensure sequential numbering with no gaps or duplicates
Keep the description clear enough that anyone reading it knows what was supplied
Show VAT separately for each rate if you have items at different rates
If invoicing in foreign currency, also show the VAT amount in sterling

Simplified VAT invoice requirements

For supplies totalling £250 or less (including VAT), you can issue a simplified VAT invoice with fewer required details. This is particularly useful for retail sales and lower-value business transactions.

Simplified VAT invoice requirements

Reduced requirements for VAT invoices where the total value including VAT is £250 or less.

Threshold for simplified invoice: Total value including VAT must be £250 or less
1. Supplier's name: Trading name or registered company name
2. Supplier's address: Full business address
3. Supplier's VAT registration number: 9-digit GB VAT number
4. Date of supply (tax point): Date goods were delivered or services completed
5. Description of goods or services: Sufficient detail to identify what was supplied
6. Total amount payable including VAT: Gross total including VAT
7. For each VAT rate: Either the rate of VAT charged OR the amount of VAT charged (for zero-rated items state the rate as 0%)

Key differences from full invoice: No sequential invoice number required. No customer name or address required. No separate net and VAT totals required. Simplified invoices cannot be used for sales to VAT-registered businesses who need full invoices to reclaim input tax.

Retail supplies exception: Retailers can issue simplified invoices for any retail sale up to £250 regardless of customer status
Customer request: Must issue full VAT invoice if customer requests one, even for supplies under £250

Key points about simplified invoices:

You do not need a sequential invoice number
You do not need the customer's name and address
You can show either the VAT rate or the VAT amount (not necessarily both)
Retailers can use simplified invoices for any retail sale up to £250

Important: If a customer requests a full VAT invoice (for example, so they can reclaim input tax), you must provide one even if the sale is under £250.

Modified VAT invoice requirements

A modified VAT invoice is used when you want to show VAT-inclusive prices rather than VAT-exclusive prices. This is common in retail settings where prices are displayed including VAT.

Modified VAT invoice requirements

Requirements for modified VAT invoices used for supplies over £250 where VAT-inclusive pricing is shown.

When to use modified invoice: For supplies over £250 where you want to show VAT-inclusive prices per item
All 14 full invoice items required: Must include all items required for a full VAT invoice
Unit price shown VAT-inclusive: May show individual item prices including VAT instead of excluding VAT
Gross total for each VAT rate: Must show VAT-inclusive total for items at each VAT rate
VAT amount per rate: Must show total VAT charged at each rate

Modified invoices are commonly used by retailers who display VAT-inclusive prices. The invoice must clearly state that VAT is included in the prices shown. The customer can still reclaim input tax using a modified invoice.

A modified invoice must still contain all 14 items required for a full VAT invoice. The difference is that you show the unit price including VAT rather than excluding VAT. You must clearly state that prices include VAT.

Your customer can still reclaim input tax using a modified VAT invoice - the VAT amount must be shown separately.

Electronic invoicing

Electronic VAT invoices (sent by email, EDI, or other electronic means) have the same legal status as paper invoices. Most businesses now use electronic invoicing as it is faster, cheaper, and easier to store.

Electronic VAT invoicing rules

Requirements for issuing VAT invoices electronically.

Electronic invoice validity: Electronic invoices have the same legal status as paper invoices
Customer agreement: Customer must agree to receive electronic invoices (agreement can be implied by course of dealing)
Content requirements: Same 14 mandatory items as paper invoices
Format requirements: Any format acceptable (PDF, EDI, XML, etc.) provided content is complete and legible
Authenticity requirement: Must ensure authenticity of origin (who sent it) and integrity of content (not altered)
Storage requirement: Must store electronic invoices in a way that ensures readability for the retention period (6 years)
On-demand access: Must be able to provide invoices to HMRC in readable form on request

Methods for ensuring authenticity and integrity

Business controls - reliable audit trail linking invoice to supply
Advanced electronic signature - based on qualified certificate
Electronic Data Interchange (EDI) - with appropriate security

Most businesses rely on business controls. No specific technology is mandated.

Self-billing: Customer may issue invoice on supplier's behalf with prior written agreement
Third-party invoicing: Invoices may be issued by a third party on your behalf (you remain responsible)

Making electronic invoicing work

Customer agreement: Your customer must agree to receive electronic invoices. Agreement can be explicit (in your terms of business) or implied (if they accept electronic invoices without objection).

Authenticity and integrity: You must be able to demonstrate that the invoice genuinely came from you (authenticity) and has not been altered (integrity). Most businesses achieve this through normal business controls - keeping reliable records that link invoices to purchase orders, delivery notes, and payments.

Storage: Electronic invoices must remain readable for the entire 6-year retention period. Use standard formats (PDF, common accounting software formats) and maintain backup copies.

Self-billing arrangements

Self-billing is a special arrangement where your customer issues the VAT invoice on your behalf. This can simplify administration when your customer processes many transactions with you, such as in supply chains or royalty arrangements.

Requirements for self-billing:

You must have a written self-billing agreement with your customer
The customer must be VAT-registered
The self-billed invoice must contain all the information required for a valid VAT invoice
You must not issue your own invoice for supplies covered by the self-billing agreement
The agreement must be renewed if either party's VAT registration number changes

Self-billed invoices are valid for input tax recovery, provided the agreement meets HMRC requirements.

Invoice retention requirements

You must keep copies of all VAT invoices you issue and receive. These records support your VAT returns and may be requested during HMRC inspections.

VAT invoice retention requirements

How long VAT invoices must be kept and storage requirements.

Standard retention period: 6 years from the date of issue
Sales invoices issued: Must retain copies of all VAT invoices issued
Purchase invoices received: Must retain originals of all VAT invoices received (to support input tax claims)
Format of retention: Paper or electronic (electronic must be readily accessible and legible)
Credit notes: Must retain for 6 years (both issued and received)
Debit notes: Must retain for 6 years
After deregistration: Must retain records for 6 years after deregistration

HMRC may request copies of invoices during a VAT inspection or enquiry. Failure to produce invoices can result in input tax claims being disallowed and penalties for inadequate records.

VAT guide (VAT Notice 700)

What to retain:

Copies of all VAT invoices you issue (sales)
Original VAT invoices you receive (purchases) - these support your input tax claims
Credit notes and debit notes (both issued and received)
Self-billed invoices and self-billing agreements

Storage format: You can store invoices in paper or electronic form. Electronic storage must ensure invoices remain readable and accessible for the full retention period. If you receive paper invoices and scan them, you can destroy the originals provided the scanned copies are of sufficient quality.

After deregistration: You must keep VAT records for 6 years after you deregister for VAT. This includes invoices relating to periods when you were registered.

Common invoicing mistakes to avoid

These errors can cause problems for your customers and attract scrutiny during HMRC inspections:

Missing VAT registration number: Without your VAT number, the invoice is not a valid VAT invoice and your customer cannot reclaim input tax
Incorrect or missing tax point date: The date of supply affects which VAT return period the transaction falls into
Gaps in invoice numbering: Sequential numbering with no gaps or duplicates is required for audit trail purposes
Insufficient description: Descriptions must identify what was supplied - vague descriptions like "professional services" may be challenged
Wrong VAT rate: Applying the wrong rate creates errors in your VAT return and problems for your customer
VAT charged on exempt supplies: If you charge VAT on an exempt supply by mistake, you must still pay it to HMRC
Late invoicing: Invoices must be issued within 30 days of the tax point

Set up compliant invoice templates

Ensure your invoicing software or templates include all 14 mandatory items for full VAT invoices. Test that sequential numbering works correctly.
Establish invoicing procedures

Create a process for issuing invoices within 30 days of each tax point. Include procedures for different invoice types based on value.
Agree electronic invoicing with customers

Include electronic invoicing acceptance in your terms of business, or obtain explicit agreement from customers who prefer paper.
Set up secure invoice storage

Establish a system for storing both issued and received invoices for 6 years. Ensure electronic copies remain accessible and readable.
Review self-billing agreements

If you have self-billing arrangements, review them annually and renew when VAT registration numbers change.

RETAIL & CONSUMER GOODS Requirement

Retailers can issue simplified invoices for any retail sale up to £250, regardless of the customer's VAT status. This applies to point-of-sale transactions where a full invoice would be impractical.

Till receipts as invoices: A till receipt can serve as a simplified VAT invoice if it includes your name, address, VAT registration number, date of supply, description of goods, and either the VAT rate or amount.

If a customer requests a full VAT invoice (for example, a business customer wanting to reclaim input VAT), you must provide one even for sales under £250.

Who this applies to: VAT-registered retailers making point-of-sale transactions

VAT guide (Notice 700) - invoicing requirements

Business Context Testing

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Guvnor

VAT invoice requirements

When you must issue a VAT invoice

Time limits for issuing VAT invoices

Types of VAT invoice

Full VAT invoice requirements

Simplified VAT invoice requirements

Modified VAT invoice requirements

Electronic invoicing

Making electronic invoicing work

Self-billing arrangements

Invoice retention requirements

Common invoicing mistakes to avoid

Set up compliant invoice templates

Establish invoicing procedures

Agree electronic invoicing with customers

Set up secure invoice storage

Review self-billing agreements

Retail invoicing rules

Compliance Assistant

🧪 Business Context Testing

◉ Content Graph

When you must issue a VAT invoice

Time limits for issuing VAT invoices

Types of VAT invoice

Full VAT invoice requirements

Simplified VAT invoice requirements

Modified VAT invoice requirements

Electronic invoicing

Making electronic invoicing work

Self-billing arrangements

Invoice retention requirements

Common invoicing mistakes to avoid

Set up compliant invoice templates

Establish invoicing procedures

Agree electronic invoicing with customers

Set up secure invoice storage

Review self-billing agreements

Retail invoicing rules

Related guides in Tax & Finance

Business Context Testing

Content Graph