Invoice vs Quotation vs Proforma Invoice Explained
Selling a product or service often involves several documents, and it is easy to mix them up. The invoice vs quotation vs proforma invoice question comes up constantly for freelancers and small businesses. Each document has a different job at a different stage of the sale. Using the right one keeps your clients informed, protects you from misunderstandings and keeps your records tidy. This guide explains all three in plain language.
What Is a Quotation?
A quotation, often called a quote or estimate, tells a prospective client how much you would charge for specific work. It is sent before any work begins. The client uses it to compare options and decide whether to hire you.
A good quotation lists the scope of work, the price, any assumptions and how long the offer stays valid. It is usually not a legal demand for money. Instead, it is an offer. Once the client accepts, it often becomes the basis for a contract or an order.
What to include in a quotation
- A clear description of the work and deliverables.
- The price, broken into lines where helpful.
- An expiry date for the offer.
- Payment terms you intend to use.
- Any exclusions, such as extra revision rounds.
What Is a Proforma Invoice?
A proforma invoice is a preliminary bill. It looks much like an invoice, but it is sent before the sale is final, and it is not normally a request for payment on its own. The term "proforma" simply means "as a matter of form".
Businesses use proforma invoices for several reasons. Exporters use them to help customers arrange import permits or financing. Suppliers use them when a client wants to pay in advance. Some organisations need one to approve a purchase internally before a final invoice is issued.
Watch out: A proforma invoice is not a tax invoice in most places. It usually cannot be used to reclaim VAT or GST, so always issue a proper invoice once the sale is complete. Rules vary, so check with a local tax professional.
What Is an Invoice?
An invoice is the final request for payment. It is issued after you have delivered goods or services, or when a payment milestone has been reached. It records the sale, sets the due date and supports your accounting and tax reporting.
Unlike a quotation, an invoice is a definite statement of what the client owes. For a full walkthrough of its required fields, see what to include in an invoice.
The Three Documents Compared
The table below puts the key differences side by side.
| Feature | Quotation | Proforma invoice | Invoice |
|---|---|---|---|
| Stage of the sale | Before the deal | Before or at the point of agreement | After delivery or milestone |
| Purpose | Offer a price | Preview the bill, support approvals or advance payment | Request payment |
| Legally demands payment | No | Usually no | Yes, once agreed |
| Has a due date | Has an expiry date | Sometimes | Yes |
| Used for tax records | No | Generally no | Yes |
| Can change | Yes, if the scope changes | Yes | Should be final |
How They Fit Together in a Real Project
Imagine you are a freelance photographer. A client asks what a day of event coverage costs. You send a quotation with your day rate, the editing included and an offer expiry date. The client accepts.
The client's finance team wants paperwork before releasing a deposit, so you send a proforma invoice for the deposit amount. They pay it. After the event and delivery of edited photos, you send a final invoice for the balance, crediting the deposit already received.
Each document had a distinct job, and the client always knew where they stood. If you often take deposits, read our article on deposit and milestone invoicing to see how to structure them.
Tip: Make the numbers on your quotation and your final invoice match wherever the scope has not changed. When a client sees the same figures twice, trust grows.
Which One Should You Use?
Use a quotation when
You are pitching for work and want to give a firm price. It is common for projects that involve some negotiation or comparison against other suppliers.
Use a proforma invoice when
The client needs a formal-looking document before paying or approving a purchase, or when you are shipping goods internationally and customs or banks ask for a preview of the transaction.
Use an invoice when
Work has been delivered or a milestone is complete, and you are ready to be paid. This is the document that goes into your accounts.
A quote says "this is what I would charge", a proforma says "this is what the bill will look like", and an invoice says "this is what you owe".
Common mistakes to avoid
- Treating a quote as a final bill. Quotes are offers, so convert them into invoices only after work is agreed and delivered.
- Using a proforma as a tax invoice. It may not satisfy tax authorities.
- Letting a quote stay open forever. Always include an expiry date so prices can be updated.
- Using different numbering for each document with no system. Keep numbering clear to avoid confusion. For ideas, see how to number your invoices.
Frequently Asked Questions
Is a quotation legally binding?
It depends on where you live and how the quotation is worded. Often a quote becomes binding once the client accepts it. If this matters to you, get advice from a local legal professional.
Can I turn a proforma invoice into a final invoice?
Yes. Many businesses issue a final invoice that references the earlier proforma and credits any amount already paid.
Do I need a quotation before I send an invoice?
No. A quotation is optional, though it helps set expectations. For small, repeat jobs, many freelancers agree prices by email and invoice afterwards.
When your work is done and you are ready to be paid, we can help. Create a free invoice now and send a clean PDF to your client.