Basic Invoice Template - UK

A UK invoice must include your business name, address, and contact details; the client's name and address; an invoice number and date; a clear description of goods or services supplied; the quantity and unit price; the total amount due including VAT; and your VAT registration number if registered. The invoice should also show your payment terms and the date by which payment is due. These requirements ensure compliance with HMRC regulations and make your records suitable for tax purposes and accounting.

No, VAT is only required on invoices if you're registered with HMRC. If your turnover is below the VAT threshold (currently £85,000 annually), you can choose to issue invoices without VAT. However, if you are VAT registered, you must include VAT on all invoices regardless of the client or invoice amount. Even if you're not VAT registered, you should still itemize clearly and show the total amount due. Some businesses include VAT as voluntary compliance.

Invoice numbers should be sequential and unique, starting from any number you choose initially. The most common approach is to begin with 001 or 1001 and increment by one for each invoice. Your numbering system must not have gaps or revert to lower numbers, as this raises red flags with HMRC during tax audits. Including the date in your invoice number (such as 2025-001) helps organize records chronologically. The key requirement is consistency—whatever system you choose, maintain it throughout your financial year.

Yes, a basic template works well for retainer invoicing by adapting the line items to reflect your monthly or recurring work. Instead of listing individual tasks, you might show "Retainer services for March 2025" with the agreed retainer amount. For multi-month retainers, create separate invoices for each billing period to keep records clear for both you and your client. Some templates allow you to add reference fields for the retainer agreement number or service period dates, making it easier to track ongoing relationships.

UK invoices commonly use Net 30 (payment due within 30 days) as the standard term, though Net 14 or Net 60 are also used depending on your agreement with clients. The payment date should be clearly stated on the invoice (for example, "Due 15 April 2025"). For small businesses invoicing larger companies, negotiating faster payment terms protects cash flow. Late payment can trigger interest charges and compensation claims under UK law, so stating clear terms protects both parties and reduces disputes.

UK businesses must keep invoice records for six years, starting from the end of the financial year in which the invoice was issued. This requirement applies to all invoices—both copies you issue and receipts from suppliers. HMRC audits can look back six years, and failure to produce invoice records during an audit can result in penalties and additional tax assessments. Digital copies are acceptable if they're legible and stored securely. Some accountants recommend keeping records for longer if you have outstanding client claims.

Invoices issued to UK clients should typically be in GBP (British pounds), as this is the legal currency and simplifies record-keeping and tax reporting. If you invoice an international client and agree to use another currency (EUR, USD, etc.), note the exchange rate used and keep documentation of the conversion. For HMRC records, you'll need to convert foreign currency invoices to GBP at the exchange rate on the invoice date. Using GBP for all UK transactions avoids confusion and ensures clarity on the amount due.

Your invoice must show your full business name, registered address, and contact information (email and/or phone). If you're a limited company, include your company registration number; if you're self-employed or a partnership, your National Insurance number isn't required on the invoice but should be in your records. If VAT registered, display your VAT registration number prominently. Include bank details only if you choose (payment method details). Ensure all information is accurate and matches your HMRC records to avoid compliance issues during audits.