Quote, invoice, receipt, and purchase order: what each one is for
A quote offers a price, a purchase order accepts it, an invoice asks for payment, and a receipt confirms the payment arrived. That is the whole chain in one sentence. This guide explains who sends each document, compares them in a table, and follows 3 short scenarios. The invoice generator and the other document tools each make one link in the chain.
The order of documents in a sale
Most sales between businesses follow the same path, even when a step or two is skipped. Each document has one job, and each one moves the sale forward by a single step.
- Quote or estimate. The seller tells the buyer what the work or goods will cost. A quote is usually a fixed price. An estimate is a best guess that may change once the work starts.
- Purchase order. The buyer tells the seller what they want, at what price, and where to deliver it. It turns the offer into a firm order.
- Invoice. Once the goods ship or the work is done, the seller asks for payment and sets a due date.
- Receipt. After the money arrives, the seller confirms the payment, the amount, and how it was made.
Small sales often skip the middle steps. A customer in a shop gets only a receipt. A freelancer working for a private person may send a quote and then an invoice, with no purchase order in between. Larger organizations tend to use all 4, because each one leaves a record that their finance team can match against the others.
Who sends each document, and to whom
The seller sends 3 of the 4 documents: the quote, the invoice, and the receipt. The buyer sends one, the purchase order. That is the quickest way to tell a purchase order from an invoice. Both list items and prices, but they travel in opposite directions.
A proforma invoice sits between a quote and an invoice. It looks like an invoice and carries the same details, but it goes out before the sale to show the buyer what the final invoice will say. Buyers use it to arrange payment in advance or to clear goods through customs. It is not a formal demand for payment, and in many countries it does not count as a tax document.
The 4 documents compared side by side
| Document | Sent by | When | Money | Tax document? |
|---|---|---|---|---|
| Quote or estimate | Seller to buyer | Before the sale | Offers a price | Usually not |
| Purchase order | Buyer to seller | When the buyer agrees to buy | Commits to a price | Usually not |
| Invoice | Seller to buyer | After delivery or at an agreed stage | Asks for payment | Often, when tax is charged |
| Receipt | Seller to buyer | After payment | Confirms payment | Sometimes, depending on the country |
The last column has the most local variation. In many countries, an invoice that shows tax is the record a business uses to reclaim that tax, so its contents are set by law. Your tax authority publishes what a valid tax invoice must show where you trade.
Quote versus invoice: before and after
A quote looks forward and an invoice looks back. A quote says what something will cost if the buyer agrees, and it carries a valid until date. An invoice says what is owed for something already supplied, and it carries a due date. When a quote is accepted, the same lines usually become the invoice, with a new title, number, and date.
In the worked example on the quote and estimate maker, Northline Carpentry in Austin quotes Maria Chen USD 2,273.25 for a custom bookshelf and its installation, including sales tax at 8.25%. A 30% deposit of USD 681.98 is due on acceptance, which leaves USD 1,591.27 for the final invoice. Our guide on how to write an invoice lists what that final invoice needs to carry.
Purchase order versus invoice: buyer and seller
A purchase order is the buyer's promise to buy. It lists the goods, the agreed price, and a delivery date. In the example on the purchase order generator, Gulf Fitout LLC in Dubai orders oak boards and hinges from Emirates Timber Trading. The order totals AED 4,959.00, made up of AED 4,580.00 of goods, AED 229.00 of VAT at 5%, and AED 150.00 of shipping. When the timber arrives, the supplier's invoice quotes the order number, PO-0105, so the buyer can match the two.
Matching is the whole point. Many finance teams compare the invoice with the order and the delivery note before they pay. An invoice that quotes the right order number and the same prices passes that check without a phone call.
Invoice versus receipt: asking and confirming
An invoice asks for money, and a receipt confirms it arrived. A paid invoice can serve as a record, but a receipt is cleaner, because it shows the date and method of the actual payment. Rent is a good example. In the example on the receipt maker, Sunrise Apartments in Bengaluru gives a tenant a receipt for INR 19,500.00, made up of INR 18,000.00 of rent and INR 1,500.00 of maintenance, paid by bank transfer. No invoice was sent, because the rent was already agreed in the lease.
Three short scenarios, start to finish
A freelancer. A designer is asked to build a website. She sends a quote with a fixed price that stays valid for 30 days. The client accepts by email. When the site goes live, she sends an invoice on net 14 terms. The client pays, and she follows with a receipt because the client needs one for an expense claim.
A shop. A customer buys a lamp at the counter and pays by card. There is no quote, order, or invoice. The till prints a receipt, which is the only document in the whole sale. If the buyer is a business that wants to reclaim tax, the shop may issue a full tax invoice on request, where local rules allow it.
An office buying from a supplier. An office manager needs 20 chairs. She asks 2 suppliers for quotes and picks one. Her company raises a purchase order with the agreed price and a delivery date. The chairs arrive with a delivery note, the supplier sends an invoice that quotes the order number, and the accounts team pays on the due date. The supplier then sends a receipt or a statement showing the invoice as paid.
Where the payslip fits in
The fifth document tool on PayCalculus, the payslip generator, is not part of a sale. It records the wages paid to an employee for a period, with earnings, deductions, and net pay. It sits beside the others because small businesses often make all 5 documents by hand. Our guide to what a payslip should show walks through each line.
Common questions about sales documents
Is a quote binding once it is accepted? It can be, but that depends on the wording and on local contract law. An estimate is usually read as a guide rather than a firm price. A document called a quote, with a valid until date, makes a fixed price clearer to both sides.
Can one document be both an invoice and a receipt? Some businesses stamp a paid invoice with the word Paid, the date, and the method, and send it back as a receipt. That works for many purposes, but some clients and some tax rules expect a separate receipt.
Do I need a purchase order before I can invoice? No. Purchase orders come from buyers, mostly larger companies. If a client gives you an order number, put it on your invoice, because their accounts team may hold payment until it matches.