How to Invoice a Client in United Kingdom

A complete guide to VAT-compliant invoicing

A UK VAT invoice must carry your business name and address, VAT registration number, invoice date, a unique sequential invoice number, customer details, a description of the goods or services, the VAT rate applied, and totals excluding and including VAT. Registration becomes compulsory once taxable turnover exceeds £90,000 in any rolling 12-month period, and the standard rate is 20%. Supplies above £250 need a full VAT invoice; £250 or less can use a simplified one.

Invoicing in United Kingdom requires compliance with local VAT regulations and specific formatting standards. Whether you are a freelancer, small business owner, or agency, this guide covers everything you need to create professional, legally compliant invoices in United Kingdom using GBP (£).

Legal Requirements for United Kingdom Invoices

✓Register for VAT if your taxable turnover exceeds £90,000 in a 12-month period. Display your VAT registration number prominently on all VAT invoices.
✓Comply with Making Tax Digital (MTD) requirements by using compatible software to keep digital records and submit VAT returns directly to HMRC.
✓Issue the correct VAT invoice type: full VAT invoices for supplies over £250 and simplified VAT invoices for supplies of £250 or less.
✓Apply the domestic reverse charge for construction industry services (CIS) where applicable, clearly noting that the customer must account for the VAT.
✓Support self-billing arrangements where the customer issues the invoice on your behalf, with both parties agreeing in writing and the self-billed invoice meeting all HMRC requirements.
✓Issue credit notes when correcting errors on previously issued invoices, referencing the original invoice number and clearly stating the reason for the adjustment.
✓Include all HMRC-mandated fields: your name and address, VAT number, invoice date, unique sequential invoice number, customer details, description of goods or services, VAT rate(s), and total amounts excluding and including VAT.

Step-by-Step: Create an Invoice for United Kingdom

Follow these steps to create a compliant United Kingdom invoice with proper VAT handling.

Estimated time: About 10 minutes

1
Set Up Your Business Details with VAT Number
Enter your business name, registered address, and VAT registration number. If you are not yet VAT-registered, you can still create invoices but cannot charge or display VAT. Your details must match your HMRC registration exactly.
2
Ensure Making Tax Digital Compliance
Verify that your invoicing software is MTD-compatible, meaning it can maintain digital records and submit VAT returns electronically to HMRC. All VAT-registered businesses must comply with MTD requirements since April 2022.
3
Enter Client Details
Add your client's business name, address, and VAT number if they are VAT-registered. For B2B transactions, having the client's VAT number is essential for proper VAT accounting and may be required for zero-rating intra-community supplies.
4
Add Line Items with VAT Rates
Create detailed line items for each product or service, specifying the applicable VAT rate. The UK has three VAT rates: standard (20%), reduced (5% for items like home energy), and zero (0% for items like most food and children's clothing).
5
Calculate VAT Correctly
Ensure VAT is calculated accurately for each line item and displayed separately on the invoice. Show the net amount, VAT amount, and gross total. If multiple VAT rates apply, break down the VAT by rate.
6
Set Payment Terms in GBP
Specify payment terms and the due date. Common UK terms include 30 days from invoice date. Include your bank details (sort code and account number) or other accepted payment methods. The Late Payment of Commercial Debts Act allows you to charge interest on overdue B2B invoices.
7
Generate a Professional PDF
Create and download a PDF invoice that includes all HMRC-required fields. Ensure the invoice has a unique sequential number, as HMRC requires invoices to be numbered in an unbroken sequence.
8
File and Archive for VAT Returns
Save a copy of every invoice for your records. HMRC requires you to keep VAT records for at least 6 years. Use your MTD-compatible software to record the transaction for inclusion in your next VAT return.

Tips for Invoicing in United Kingdom

Use MTD-compatible software for all VAT record-keeping and submissions. HMRC can impose penalties for non-compliance, and manual spreadsheets are no longer acceptable as the primary record unless bridging software is used.
VAT returns are due quarterly, with payment due one month and seven days after the end of each VAT period. Set reminders to avoid late filing penalties and interest charges.
Issue simplified VAT invoices for transactions of £250 or less to save time. These require fewer details than full VAT invoices but are still valid for VAT purposes.
Keep all invoices, credit notes, and financial records for at least 6 years. HMRC can audit your records at any time, and failure to produce documentation can result in estimated assessments and penalties.
If you sell to EU customers post-Brexit, you may need to account for export documentation, customs declarations, and different VAT treatment depending on whether the customer is a business or consumer.

United Kingdom Invoicing FAQ

Do I need to register for VAT?

You must register for VAT if your taxable turnover exceeds £90,000 in any 12-month rolling period, or if you expect it to exceed this threshold in the next 30 days alone. You can also voluntarily register below this threshold, which allows you to reclaim VAT on business purchases. Once registered, you must charge VAT on all taxable supplies and file regular VAT returns.

What is the difference between a full and simplified VAT invoice?

A full VAT invoice is required for taxable supplies exceeding £250 and must include comprehensive details such as both parties' names and addresses, VAT number, invoice number, date, item descriptions, VAT rates, and totals. A simplified VAT invoice can be used for supplies of £250 or less and only needs your name, address, VAT number, the date, a description of goods or services, and the VAT-inclusive total.

What are the mandatory fields on a UK VAT invoice?

A full UK VAT invoice must include: a unique sequential invoice number, the invoice date, your business name and address, your VAT registration number, the customer's name and address, a description of goods or services supplied, the quantity, the unit price excluding VAT, the total excluding VAT, the VAT rate applied, the VAT amount, and the total including VAT. Missing any of these fields can cause issues during HMRC audits.

How does Making Tax Digital affect my invoicing?

Making Tax Digital requires all VAT-registered businesses to maintain digital records and submit VAT returns using MTD-compatible software. You cannot manually type VAT return figures into HMRC's portal. Your invoicing and accounting records must be kept digitally, and any data transfer between software must use digital links rather than manual re-entry.

Can I charge interest on late payments?

Yes, under the Late Payment of Commercial Debts (Interest) Act 1998, you can charge interest on overdue B2B invoices at 8% plus the Bank of England base rate. You can also claim fixed-sum compensation: £40 for debts up to £999.99, £70 for debts between £1,000 and £9,999.99, and £100 for debts of £10,000 or more. These rights apply automatically but should be stated on your invoices.