Self-Employed Invoice Template: What to Include

As a sole trader in the UK, you don't have the same invoicing obligations as a limited company — but you still need to get the basics right. HMRC expects you to keep accurate records of all income and expenses, and your invoices form a core part of that record.

Unlike limited companies, sole traders don't need to include a company registration number or registered office address. However, you must include your full name (or trading name), your address, and enough detail for the invoice to serve as a clear record of the transaction.

If you use a trading name that differs from your legal name, it's good practice to include both. For example: "Jane Smith trading as Bright Copy". This avoids confusion if a client needs to verify who they're paying.

The key legal requirement is record keeping. HMRC requires self-employed individuals to retain invoices and financial records for at least five years after the 31 January Self Assessment deadline for the relevant tax year. Using invoicing software like OwnedWork makes this automatic — every invoice is stored and searchable.

If you're not VAT-registered, your invoices are simpler because you don't need to include VAT breakdowns. But that doesn't mean you should cut corners on professionalism. A clear, well-structured invoice gets paid faster than a hastily written email asking for money.

Whether or not you're VAT-registered, every self-employed invoice should include these fields. For a full breakdown, see what to include on an invoice.

• Your name and contact details — Full name or trading name, address, email, and phone number.
• Client's name and address — The person or company you're billing.
• Invoice number — A unique, sequential identifier. See invoice numbering for best practices.
• Invoice date — The date you issue the invoice.
• Due date — When payment is expected, based on your payment terms.
• Description of work — Clear line items describing each service or product supplied, with quantity and unit price.
• Total amount due — The sum of all line items. Make this prominent and unmistakable.
• Payment details — Bank name, sort code, account number, and account holder name. Include PayPal or other methods if accepted.
• Payment terms — e.g. "Net 30" or "Due on Receipt". Include any late payment policy.

Optional but recommended fields include a purchase order number (if your client provided one), a brief project reference, and your UTR (Unique Taxpayer Reference) if your client requests it — though this is not generally required on invoices.

If your annual taxable turnover is below the VAT threshold (currently £90,000), you don't need to register for VAT. Your invoices should not include any VAT line or VAT number. Here's what a non-VAT sole trader invoice looks like in practice:

At the top, place your name and contact details on one side and the word "INVOICE" prominently on the other. Below that, add your client's details and the invoice number, date, and due date.

The body of the invoice is a table of line items. Each row should include:

1. A clear description of the service (e.g. "Brand identity design — logo, colour palette, and typography guidelines")
2. Quantity (e.g. 1)
3. Unit rate (e.g. £800.00)
4. Line total (e.g. £800.00)

Below the table, show the subtotal and total due. Since you're not charging VAT, these will be the same amount. Do not include a VAT line showing £0.00 — this can confuse clients and may imply you should be charging VAT.

At the bottom, include your payment details and terms. A note like "Not VAT-registered" is optional but can be helpful for clients who might expect to see VAT on the invoice. You can generate a non-VAT invoice instantly using OwnedWork's free invoice generator.

If you're VAT-registered (either because you've exceeded the £90,000 threshold or registered voluntarily), your invoices must include additional information mandated by HMRC. Missing any of these fields means the invoice isn't a valid VAT invoice — which can cause problems for your client's VAT reclaims.

In addition to all the standard fields, a VAT invoice must include:

• Your VAT registration number
• The VAT rate applied to each line item (standard rate is 20%, reduced rate 5%, zero rate 0%)
• The net amount (before VAT) for each line item
• The VAT amount for each line item
• The gross total (net + VAT)

Your line item table should have columns for: description, quantity, net unit price, VAT rate, VAT amount, and gross total. Below the table, show a summary: net subtotal, total VAT, and grand total.

If you supply a mix of items at different VAT rates (e.g. standard-rated consulting and zero-rated exported services), list them separately and show a VAT breakdown by rate. For a detailed guide on VAT invoicing rules, see VAT invoice requirements.

If you're on the Flat Rate Scheme, you still invoice clients at the standard 20% VAT rate. The flat rate only affects how much VAT you pay to HMRC — it doesn't change what appears on your invoice.

Even experienced freelancers make invoicing errors. Here are the most common mistakes sole traders make — and how to avoid them.

• Charging VAT when not registered — This is illegal. If you're not VAT-registered, do not include a VAT line on your invoice. Clients may refuse to pay the VAT portion, and HMRC could investigate.
• Vague descriptions — "Consulting work" or "Services rendered" makes it harder for clients to approve payment and gives you a weaker position if there's a dispute. Be specific about what you delivered.
• Missing or duplicate invoice numbers — HMRC requires sequential numbering with no gaps. Duplicate numbers cause confusion and can trigger queries during a tax investigation.
• Forgetting payment details — You'd be surprised how many freelancers send invoices without bank details. Make it as easy as possible for the client to pay you.
• Not setting a due date — Without a clear due date, clients have no deadline. Always state when payment is expected, whether that's "Due on Receipt" or "Net 30".
• Invoicing late — The longer you wait to invoice, the longer you wait to get paid. Invoice immediately upon completing the work or reaching the agreed milestone.

Using a dedicated invoicing tool eliminates most of these errors automatically. OwnedWork pre-fills your details, assigns sequential numbers, calculates totals, and reminds you to include all essential fields before sending.