Invoice vs Quotation vs Delivery Note: What's Actually the Difference
If you run a business — even a very small one — you'll eventually need all three of these documents, and using the wrong one at the wrong moment causes real problems: a quotation sent as an invoice can confuse a customer into thinking they've already been billed; an invoice sent before goods actually ship can create a paper trail that doesn't match reality. The good news is the distinction is simple once you see it laid out.
The quotation: a proposal, not a bill
A quotation (or quote) is an offer — a statement of what you would charge for specific goods or services, sent before any work begins or any goods change hands. It is not a request for payment and creates no obligation for the customer to pay anything. Its entire purpose is to let a potential customer compare your pricing and decide whether to proceed.
A good quotation includes an expiry date (prices can change, and you shouldn't be bound to a quote from six months ago), a clear scope of what's included, and enough detail that if the customer says yes, converting it into an invoice later is straightforward.
The invoice: a formal request for payment
An invoice is a formal, legally significant request for payment for goods or services that have already been provided, or are being provided under an agreed arrangement. Unlike a quotation, an invoice does create an obligation — it's a record that a debt exists and is due, and it's the document accountants and tax authorities actually care about.
- A unique invoice number, for both your own records and the customer's — this matters enormously for accounting and dispute resolution.
- The exact date of issue and the payment due date, since these determine when a payment is officially late.
- A clear itemized breakdown of what's being charged for, including any applicable tax, so the total is fully transparent.
- Your business's registration or tax details where required by local regulation.
The delivery note: proof of what physically arrived
A delivery note (sometimes called a packing slip or waybill in transport contexts) accompanies physical goods and confirms exactly what was included in a shipment — quantities, item descriptions, sometimes condition on arrival. Critically, a delivery note usually shows no prices at all. Its job isn't financial; it's a factual record that specific items physically left one location and arrived at another.
This distinction matters in disputes: if a customer claims an order arrived incomplete, the delivery note (signed on receipt, ideally) is the reference document — not the invoice, which only records what was supposed to be billed, not what was physically confirmed as received.
How the three typically fit together in order
- Quotation sent — you propose pricing and scope; the customer has not committed to anything yet.
- Customer accepts — the quotation effectively becomes the agreed basis for the work or order.
- Goods shipped with a delivery note — if physical goods are involved, this confirms exactly what was sent.
- Invoice issued — the formal request for payment, referencing the agreed quotation and, if applicable, the delivered goods.
Not every transaction needs all three — a simple service with no physical goods might only need a quotation followed by an invoice, skipping the delivery note entirely since there's nothing physical to track.
Common Mistakes
Sending a quotation and treating it as if it were already an invoice
A quotation creates no payment obligation. If a customer needs to be formally billed, a proper invoice needs to be issued — sending only a quote and expecting payment can create real confusion and delay.
Leaving an invoice without a due date
Without an explicit due date, it's genuinely ambiguous when a payment becomes officially late, which weakens your position if you ever need to follow up on an overdue payment.
Not keeping the delivery note as a separate record from the invoice
If a delivery dispute arises, the signed delivery note is the relevant proof of what was physically received — an invoice alone doesn't serve that purpose since it only records what was billed.
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