An invoice is a document a seller sends to a customer to describe goods or services supplied and request payment under agreed terms. It records the amount, the parties and the transaction; it is not proof that payment has already been made.
An invoice is a business billing document issued by a seller or service provider to a customer. It identifies what was supplied, how the amount was calculated, how much is due and the payment terms. The invoice gives both sides a reference for the transaction and for later record keeping.
Who sends and receives an invoice?
The seller (sometimes called the supplier or service provider) issues the invoice. The customer or buyer receives it and pays the amount due, subject to the parties’ agreement. For example, a design studio that completes a website project sends its client an invoice for the agreed work.
What does an invoice contain?
A typical invoice identifies the seller and customer, has a unique invoice number, an issue date and often a due date. It describes products or services, quantities, rates, subtotal, any agreed discount, applicable tax, total, payment terms and payment instructions. The exact fields depend on the transaction and jurisdiction; this general list is not a universal legal checklist. For a field-by-field walkthrough, see what an invoice should include.
An invoice requests payment; it does not record payment
An invoice normally requests that the customer pay. A receipt instead records that money was received. A payment is the transfer of funds itself. After a customer pays, the seller can match that payment to the invoice and issue a receipt or other confirmation when appropriate.
Invoice vs quote, estimate and receipt
| Document | Purpose | When to use it |
|---|---|---|
| Invoice | Request payment for agreed work or goods | At the billing point in the agreement |
| Quote | Propose a price before acceptance | Before the customer commits |
| Estimate | Communicate expected costs | When the final scope may still change |
| Receipt | Record money received | After payment is confirmed |
Use the quote generator, estimate generator or receipt generator when that stage fits better than an invoice.
Where an invoice fits in the business workflow
A quote or estimate can come before acceptance or work. A purchase order usually comes from the buyer. Once the agreed work or supply reaches the billing point, the seller issues an invoice. Payment satisfies some or all of the balance; a receipt can confirm what was received. A credit note can document an adjustment to an invoice.
Common invoice types
- Sales or service invoice: bills for goods supplied or work performed.
- Recurring invoice: bills a repeating service or subscription according to an agreement.
- Tax invoice: a jurisdiction-specific document category that may have additional tax details; the term is not a universal format. See what is a tax invoice, GST invoice and VAT invoice.
- Proforma invoice: a preliminary commercial document, distinct from an actual billing invoice in many workflows.
- Commercial invoice: a goods/shipping document used in relevant trade workflows; extra details depend on the transaction.
Why businesses issue invoices
- Give the customer a clear, itemized request they can approve and pay against.
- Create a shared reference for accounting, bank matching and later questions.
- Support cash-flow planning by stating when payment is expected.
- Connect the bill to a quote, purchase order, timesheet or delivery record.
Example
Suppose Northstar Design Studio completes a logo project for Acme Café. The studio sends invoice INV-2026-014 dated 7 October 2026. It lists the design service at $1,000 and states the agreed due date and payment instructions. The invoice asks Acme Café to pay; it does not prove payment. Once the studio confirms receiving the transfer, a receipt can record the $1,000 payment and refer back to INV-2026-014.
Ready to draft one? Use the free invoice generator or follow how to create an invoice step by step.
Frequently asked questions
Is an invoice the same as a bill?
In many everyday business settings, invoice and bill can refer to the same request for payment. The wording may vary by industry or perspective, so check the document context rather than assuming a universal legal distinction.
Does an invoice prove that I paid?
No. An invoice normally requests payment. A receipt or payment confirmation records money received; check whether the payment has actually cleared before marking an invoice paid.
When should a business issue an invoice?
Issue it at the billing point set by the agreement and applicable rules—for example, after delivery, at a milestone or on a recurring schedule. Timing requirements can differ by jurisdiction and transaction.
What is the difference between an invoice and a receipt?
An invoice asks for payment. A receipt records that money was received. See the invoice vs receipt guide for a side-by-side comparison.
Can I create an invoice online for free?
Yes. You can use a free invoice generator in your browser to draft, preview and download an invoice PDF without creating an account. Review the result against your agreement before sending it.
General information only—not legal, tax or accounting advice. Requirements can vary by jurisdiction, transaction and agreement. Confirm what applies to your situation.