Simple Invoice Template - UK

You must include VAT if you're registered with HMRC. If your turnover hasn't reached the £85,000 threshold (as of 2025), VAT registration is optional but recommended. Once registered, you're legally required to charge VAT on sales to other UK businesses and consumers at the standard rate (20% for most goods and services). If your invoice is to a VAT-registered business in another EU/EEA country, reverse charge may apply. Include your VAT registration number prominently on every invoice if registered.

UK law requires invoices to include: your business name and address, the client's name and address, a unique invoice number and date, a description of goods or services provided, the price per item and total amount due, and if VAT-registered, your VAT registration number and the VAT amount. These details must be clear and permanent, typically in writing or digital format. Additional payment terms and banking details, while not legally mandated, help avoid disputes and speed up payment processing.

Calculate VAT by applying the applicable rate (standard 20%, reduced 5%, or zero 0%) to the net amount. Display VAT separately from the subtotal so clients see exactly what they're paying in tax. The invoice must show three amounts clearly: the net (before VAT), the VAT amount, and the total (including VAT). Include your VAT registration number above or beside the VAT calculation. For VAT-exempt services, mark items as "VAT exempt" rather than omitting VAT information entirely.

Yes, but with adjustments. For clients within the EU/EEA, VAT reverse charge rules may apply—you invoice at 0% VAT and let them account for VAT in their country. For non-EU clients, invoice at 0% VAT or your standard rate depending on your business model and location of supply rules. Always include your VAT registration number. Consider noting payment currency (GBP vs. their local currency) and any import duties or fees they might face. Check current HMRC guidance for your specific business type.

UK law doesn't mandate a specific numbering format, but invoices must be numbered sequentially and uniquely—no gaps or reuse. Your numbering system must remain consistent and unbroken to satisfy tax authority requirements and prevent fraud. You can use simple sequences (001, 002, 003) or include date components (INV-20250621-001), but the sequence itself must never restart. Maintain your numbering system even if you issue fewer invoices in a given month; skipping numbers raises compliance concerns during audits.

HMRC requires businesses to keep invoice records for at least six years from the end of the financial year in which they were issued. This applies whether invoices are paper or digital. Digital invoices must be stored in a format that can be easily retrieved and remains readable. If you're VAT-registered, six years is the standard retention period for both invoices issued and received. Poor record-keeping during an HMRC investigation can result in penalties, so proper storage and backup systems are essential.

Absolutely. Simple invoices work perfectly for service businesses like consulting, freelancing, design, digital marketing, and maintenance work. The template accommodates hourly rates and itemized services just as easily as product sales. However, if you provide multiple services with different VAT rates, ensure each line item clearly shows its rate and VAT treatment. For complex contracts with milestone payments or retainers, you may need to add payment schedule details, but the basic simple invoice format remains the foundation.

Include clear payment terms: Net 30 (payment due within 30 days) is standard for UK businesses, though you can specify Net 14, Net 45, or immediate payment as needed. List your payment methods—bank transfer details, credit card information, or payment platform links—to reduce processing delays. Include your business bank details (sort code and account number) clearly, as bank transfer is the most common UK payment method. Specify any late payment penalties or early payment discounts if applicable, and ensure your payment deadline is unmistakable.