What Is a Sales Invoice? Definition, Example & Free Template

Quick answer: A sales invoice is the document a seller issues to a buyer to request payment for goods or services that have been supplied. It lists what was sold, the quantity and price, any tax, the total due, the payment terms and the due date. For the seller it records revenue and money owed; for the buyer, the same document is recorded as a purchase invoice.

This article explains what a sales invoice must include, how it differs from similar documents, how it is recorded in your books, and walks through a worked example. When you are ready, you can create a sales invoice in minutes with our free invoice generator and download it as a PDF.

Sales invoice meaning

"Sales invoice" is simply the seller's name for an invoice. The word "sales" tells you whose books it sits in: it is generated by your sales process and recorded in your sales ledger. When your customer receives it, they file it as a purchase invoice or a bill in their accounts payable. Our explainer on invoice vs bill covers that two-sided view in more detail.

A sales invoice is issued when you sell on credit, meaning the customer pays later. It creates a legal and accounting record that the customer owes you money, starts the clock on your payment terms, and is the evidence you rely on if a payment is disputed. If you are new to billing in general, start with what is an invoice.

What a sales invoice includes

A complete sales invoice contains the following details. Some jurisdictions require more, especially where VAT or GST applies.

• The word "Invoice" (or "Tax Invoice" where your tax rules require it)
• A unique, sequential invoice number
• Invoice date and, where different, the date of supply
• Your business name, address, contact details and tax ID if registered
• The customer's legal name and billing address, plus PO number if they use one
• A line for each product or service: description, quantity, unit price and line total
• Subtotal, discounts, shipping, tax rate and tax amount
• Total amount due and currency
• Payment terms, due date and how to pay

Line-level detail matters. A buyer approves an invoice faster when each line is specific, which is the idea behind an itemized invoice.

Sales invoice example

Here is a sample sales invoice from a small kitchenware wholesaler to a US retail shop. The shop is in a jurisdiction with an 8% combined sales tax that, in this example, applies to the goods but not to the separately stated delivery charge. Whether shipping is taxable varies by state, so check your own rules.

Description	Qty	Unit price	Amount
Bamboo cutting board, large (SKU BCB-40)	40	$12.50	$500.00
Cast-iron skillet, 10 inch (SKU CIS-10)	10	$35.00	$350.00
Subtotal (taxable goods)			$850.00
Sales tax 8% on $850.00			$68.00
Delivery			$25.00
Total due			$943.00

Header details: Invoice INV-2026-0187, dated 22 October 2026, terms Net 30, due 21 November 2026, payable by ACH or card via the payment link. You can check rates and totals like this with our sales tax calculator, and our guide to sales tax on invoices in the US explains how to show it correctly.

Sales invoice vs other sales documents

Several documents appear around a sale, and mixing them up causes confusion for customers and bookkeepers alike.

Document	Issued by	When	Purpose
Quotation / estimate	Seller	Before the sale	Proposes a price
Purchase order	Buyer	Before delivery	Authorizes the purchase
Sales order	Seller	After the order is accepted	Confirms what will be delivered internally and to the buyer
Sales invoice	Seller	On or after delivery	Requests payment
Purchase invoice / bill	Recorded by buyer	When the invoice arrives	Records what the buyer owes
Sales receipt	Seller	When payment is received	Confirms payment

The relationship with the purchase order is covered in invoice vs purchase order, and the distinction with receipts in invoice vs receipt.

Types of sales invoice

Credit sales invoice

The standard type: goods or services are supplied now and paid for later under terms such as Net 15 or Net 30. This is what most people mean by a sales invoice.

Cash sales invoice

Issued when the customer pays at the time of sale but still needs an invoice, for example a business buyer who needs a tax invoice to reclaim VAT. It is often marked "Paid" and shows the payment method.

Interim or progress invoice

Used for long projects, billing a portion of the contract value at agreed stages. See our milestone payments guide for how to structure these.

Final invoice

Closes out a project, showing the full contract value, less any deposits and progress payments already invoiced.

How a sales invoice is recorded in your books

Under accrual accounting, issuing the sales invoice above would typically be recorded as:

• Debit accounts receivable: $943.00
• Credit sales revenue: $850.00
• Credit delivery income: $25.00
• Credit sales tax payable: $68.00

When the customer pays, you debit cash and credit accounts receivable. The sales tax is not your income; it is held for the tax authority. Our accounts receivable guide explains how to track open sales invoices until they are paid. If you use cash-basis accounting, you record revenue when payment arrives, but you should still issue and keep the invoice.

Sales invoice requirements when you charge tax

A basic sales invoice is enough when you are not registered for any sales tax, VAT or GST. Once you are registered, the invoice usually has to carry more detail, and in some countries it must be called a tax invoice. Typical additions are:

• Your tax registration number, and the customer's where they are also registered
• The date of supply, if it differs from the invoice date
• The tax rate applied to each line or group of lines
• The net amount, the tax amount and the gross total, each shown separately
• A note explaining any zero-rated, exempt or reverse-charge lines

In the US, sales tax rules are set by states and local jurisdictions, so the rate and whether a product or service is taxable depend on where the sale is made. In VAT and GST countries, the national rules spell out the mandatory fields. In both cases, check your obligations with your tax authority or an accountant before you start charging tax.

Common sales invoice mistakes

Most sales invoices that go unpaid are not disputed; they are simply stuck. These are the errors that stall them most often:

• Billing the wrong entity. Invoicing a person or a trading name instead of the legal company named on the purchase order.
• Missing PO number. Many accounts payable systems reject any invoice without one.
• No due date. "Net 30" alone leaves the customer to decide when 30 days starts.
• Totals that don't add up. Hand-typed totals in a document template drift from the line items.
• Duplicate or reused numbers. These cause confusion in both sets of books and raise questions in an audit.
• No payment instructions. If the customer has to email you for bank details, you've added days to the payment cycle.

A generator that calculates totals and keeps your details consistent removes most of these at the source. A two-minute review against the order before sending catches the rest.

How to create a sales invoice in 6 steps

1. Pick a layout. The Modern invoice template suits most product businesses; you can browse all invoice templates to match your brand.
2. Add your details and the customer's. Use the customer's legal entity name and include their PO number if they gave one.
3. Set the number and dates. Use the next number in your sequence, the invoice date and a due date that matches your invoice payment terms.
4. List each item. Description, SKU if you have one, quantity and unit price.
5. Apply tax, discounts and delivery. Show tax separately with its rate.
6. Add payment instructions and send. Include bank details or a payment link, download the PDF and email it to the customer's accounts payable contact.

Create your sales invoice now

A clear sales invoice gets approved and paid faster. Open the invoice generator, start from the Modern template, add your line items and download a professional PDF sales invoice in a few minutes.