PPOLARSMALL BUSINESS MANAGER

Part of our small business finance UK guide.

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Invoice Template UK

Build a complete UK invoice with business identity, customer details, payment terms, VAT logic and a proper payment section.

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Your business
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Invoice details
Charges
Payment
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What to include in a UK invoice

Use the builder above, then check the legal identity, customer, description, dates, numbering, amounts and agreed payment terms. VAT fields apply only where relevant to your registration and transaction.

What must an invoice include in the UK?

GOV.UK says a standard invoice should include the key information needed to identify the transaction, supplier, customer and amount owed.

  • a unique invoice identification number
  • your business name, address and contact information
  • the company name and address of the customer you are invoicing
  • a clear description of what you are charging for
  • the date the goods or services were supplied
  • the invoice date
  • the individual amounts being charged
  • VAT where applicable
  • the total amount owed

What should a sole trader put on an invoice?

If you are a sole trader, GOV.UK says your invoice should also show your own name and any business name you use.

If you trade under a business name, include an address where legal documents can be delivered to you.

Your personal name Include the name of the person who owns the sole-trader business.
Your trading name If you use a separate business name, show that as well.
Your address If you trade under a business name, include an address where legal documents can be served.
No company number A normal sole trader does not have a Companies House company number simply because they use a business name.
Example: Adrian Smith trading as AS Garden Care.

That immediately tells the customer who legally operates the business and which trading name appears on the invoice.

What should a limited company put on an invoice?

A limited company’s invoice needs to identify the company properly.

GOV.UK says you must use the full company name as it appears on the certificate of incorporation.

If you decide to put directors’ names on your invoices, include the names of all directors.

Common mistake: using a shortened brand name on the invoice but failing to identify the actual limited company behind it. Your customer should be able to tell which legal entity they are dealing with and paying.

What invoice number should I use?

Each invoice needs its own unique identification number. The system does not need to be clever. It needs to be consistent.

Simple INV-001
INV-002
INV-003
Year based INV-2026-001
INV-2026-002
INV-2026-003
Customer based SMITH-001
SMITH-002
The important bit Each invoice should be uniquely identifiable and your numbering system should remain orderly.
Polar tip: keep invoice numbering boring. A simple sequential system is much easier to search, reconcile and explain later than a clever code you cannot remember six months from now.

What is the difference between an invoice date and supply date?

The invoice date is the date you create or issue the invoice. The supply date records when the goods were supplied or the service was performed.

Example: You complete a decorating job on 10 August and send the invoice on 12 August.

Supply date: 10 August
Invoice date: 12 August

Should an invoice include a payment due date?

Yes. Even where your underlying payment terms already exist elsewhere, showing the date clearly removes ambiguity.

This one matters: an invoice saying Payment due: 30 September 2026 is clearer than Terms: Net 30. You can show both, but make the actual deadline obvious.

What payment terms should a small business use?

You can agree your own payment terms with customers. Depending on the work, that might mean:

  • payment upfront
  • a deposit before work begins
  • payment immediately on completion
  • 7-day terms
  • 14-day terms
  • 30-day terms
  • staged or milestone payments
Polar tip: your payment terms should ideally be agreed before you do the work. Putting “7 days” on an invoice after the customer thought they had 30 days is not a substitute for agreeing the terms properly.

What bank details should I put on an invoice?

If customers pay by bank transfer, make the process easy.

  • account name
  • sort code
  • account number
  • the payment reference you want the customer to use

Using the invoice number as the payment reference can make reconciliation much easier.

Security matters too. Invoice-redirection fraud can involve criminals sending altered bank details to customers. If your payment details change, consider confirming the change with customers through a trusted communication channel rather than relying on one unexpected email.

What description should I put on an invoice?

Be specific enough that the customer understands what they are paying for.

Weak “Work completed”
Better “Garden maintenance visit — hedge trimming, lawn care and waste removal”
Weak “Consulting”
Better “Business strategy workshop and written action plan — August 2026”
Polar tip: write the description so that a customer opening the invoice three months later can still remember exactly what the charge was for.

Should an invoice include a purchase order number?

If your customer has issued a purchase order, include its number.

Large businesses, councils and other organisations may reject or delay invoices that do not quote the correct purchase-order reference.

This one matters: before sending an invoice to a larger organisation, ask: “Do you need a purchase order number or particular invoice reference?” Five seconds now can save weeks of chasing later.

What are the most common invoicing mistakes?

Wrong legal name The invoice uses a brand but does not properly identify the person or company supplying the work.
No invoice number Making tracking, reconciliation and record keeping unnecessarily hard.
Vague description The customer cannot immediately tell what they are being charged for.
No clear due date Nobody knows exactly when the business expects the money.
Wrong bank details A tiny error can stop payment completely.
Missing PO Larger customers may reject an otherwise correct invoice because their required purchase order is missing.

Check official invoice requirements and VAT invoice rules. Continue to sending the invoice, late-payment chasing and small business finance.