Invoice types
Sales invoice
A sales invoice is the standard document a seller issues to a buyer to request payment for goods or services that have been sold.
What a sales invoice is
A sales invoice is what most people simply call an "invoice." From the seller’s point of view it records a sale and requests payment; it lists the goods or services, quantities, prices, taxes, and the total due.
It serves three jobs at once: it asks the customer to pay, it records revenue for the seller’s books, and it gives both sides a document for tax and accounting. It is the most common document type a business issues, which is why "sales invoice" and plain "invoice" are used interchangeably.
What a sales invoice includes
A complete sales invoice has your business name and contact details, the customer’s details, a unique invoice number, the issue date and due date, an itemized list of what was sold with quantities and unit prices, any sales tax, and the total due. Payment terms such as Net 15 or due on receipt and a way to pay round it out.
The invoice number matters more than people expect: it is the reference both sides use to match a payment to a sale, and it is what keeps your records auditable. An itemized breakdown also reduces disputes, because the customer can see exactly what each line covers.
Sales invoice vs. purchase invoice
The same document is a "sales invoice" to the seller who issues it and a "purchase invoice" to the buyer who receives it. The label just reflects which side of the transaction you’re on.
For the seller, the sales invoice feeds accounts receivable; for the buyer, that same purchase invoice feeds accounts payable. It is also distinct from a proforma invoice, which is a preliminary estimate sent before the sale, and from a receipt, which confirms payment after it has been made.
Example: A landscaping company finishes a job and issues sales invoice #1042. The invoice lists "Spring cleanup, 8 hours at $55" for $440 and "Mulch, 6 cubic yards at $45" for $270, a subtotal of $710, 7% sales tax of $49.70, and a total due of $759.70 with Net 15 terms. That same document is the landscaper’s sales invoice (it feeds their accounts receivable) and the customer’s purchase invoice (it feeds their accounts payable). One transaction, two labels. When the customer pays, the landscaper issues a separate receipt for $759.70.
FAQs
Frequently asked questions
Is a sales invoice just an invoice?
Yes. "Sales invoice" emphasizes the seller’s side, recording a sale and requesting payment, but it’s the standard invoice most businesses issue. When someone says "send me an invoice," a sales invoice is what they mean.
What’s the difference between a sales invoice and a purchase invoice?
They’re the same document seen from opposite sides: the seller calls it a sales invoice, the buyer calls it a purchase invoice. For the seller it is accounts receivable; for the buyer it is accounts payable.
What is the difference between a sales invoice and a receipt?
A sales invoice requests payment for a sale; a receipt confirms a payment that has already been made. You send the sales invoice first and issue a receipt once the customer pays.
What should a sales invoice include?
Your business and customer details, a unique invoice number, the issue and due dates, itemized goods or services with quantities and prices, any sales tax, the total due, payment terms, and a way to pay.
Related terms
Invoice
An invoice is a document a seller sends to a buyer that itemizes goods or services provided and requests payment by a stated due date.
Purchase order
A purchase order (PO) is a document a buyer sends to a seller to officially authorize and commit to a purchase, listing the items, quantities, and agreed prices.
Tax invoice
A tax invoice is an invoice that separately states the tax charged on a sale (such as GST, VAT, or sales tax), so a registered buyer can claim the tax as a credit.
Proforma invoice
A proforma invoice is a preliminary, good-faith estimate of costs a seller sends before goods or services are delivered, so the buyer can review and commit before a final invoice is issued.
Invoice vs. receipt
An invoice is a request for payment sent before money changes hands, while a receipt is proof of payment issued after the buyer has paid.
Itemized invoice
An itemized invoice lists each product or service as a separate line, with quantity, rate, and amount, rather than charging a single lump sum.
Put it into practice
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