What is a Proforma Invoice and What is it Used For?

Jul 14, 2026 | Uncategorized

A proforma invoice is a basic financial concept, especially for any company that conducts international sales or simply provides a formal quotation to its clients before issuing an official invoice. Therefore, its role is key in the sales cycle and remains so even after the arrival of theelectronic invoice. Therefore, thoroughly understandingwhat a proforma is and what it is used forwill help you improve operational efficiency and transparency in your business management. This is precisely what we explain in this article: its nature, differences from traditional invoices, and the benefits it brings in the corporate sphere.

What is a proforma invoice in Spain?

A proforma invoice is one that contains adetailed and specific offer for a product or service to be provided to a client.The key nuance is that it has no tax or accounting implications. In other words,it is a preliminary commitmentthrough which the parties understand the details of the operation before formalizing it.

The document resembles a conventional invoice in terms of structure and content, as it includes data on goods or services, quantities, prices, and terms of sale. The difference is that itdoes not entail immediate payment obligations and is not recorded in the official accountingof the company.

But, are there differences between a proforma invoice in Spain and other countries?

In Spain, its function is the same as in other countries: to summarize in detail the cost of a sale before its official confirmation. The fact is that itis very useful for importing and exporting goods, as well as for complying with customs requirements,where an estimation of the product value is required before the official invoice is issued.

What is a proforma invoice used for?

Primarily, the main utility of the proforma invoice is that itserves as a preliminary agreement that defines the termsof a transaction. Below, we detail its most common use cases:

  • Facilitating negotiation. By issuing a proforma invoice, you make a concrete proposal that the client can accept, reject, or modify in a clear and transparent negotiation.
  • Customs documentation. In international trade, it is often requested so that customs authorities have an exact reference of what is to be imported or exported.
  • Advance payment. It is also used as a base document to request advance payment for a good or service before the delivery of an official invoice. This way, companies secure the resources they need in advance.
  • Formal quote. Occasionally, you can use it as a formal quote, especially if you want to offer a detailed and committed proposal. In other words, they provide more formality than a simple estimate. 

Proforma invoice or quote: what’s the difference?

Precisely at this point, you might wonder how these two typical documents in the financial world differ. Well, the proforma invoice and the quote have similar functions, as neither is binding and both reflect the price of a product or service before its sale. 

However, the main difference lies in the purpose and degree of formality. We show it to you in this table:

Concept
Proforma invoice
Quote

Formality
Formal document, very similar to a real invoice
Informal document

Detail
Specifies terms and conditions of sale
Can be more general

Commitment
Serves as a preliminary commitment
Does not carry a commitment

As you can see, the proforma invoice offers a higher level of commitment and detail, which is very important in large-scale negotiations or international sales.

Differences between proforma invoice and traditional invoice

Continuing with similarities and differences with other types of invoices, although proforma and traditional invoices are similar in structure, they have three important differences:

  • Legal validity. A proforma invoice has no legal validity. This means it has no tax implications, nor can it be used to justify expenses or claim taxes. You only issue it as a reference for the client. In contrast, a traditional invoice or any other invoice, such as a corrective invoice, does have tax validity and must be recorded in the company’s accounting.
  • Payment obligation. A traditional invoice generates an immediate payment obligation. A proforma invoice, on the other hand, only establishes the terms of the agreement, without entailing a mandatory disbursement.
  • Accounting record. Issued invoices are recorded in the company’s ledger. A proforma invoice, however, does not need to be recorded in accounting, as it does not represent actual income until the final invoice is issued.

How to create a proforma invoice?

Beyond what it implies technically and legally, below we explain how to create a proforma invoice. A simple process that follows a similar scheme to a traditional one.

Therefore, the elements or data it must contain as an invoice are:

  1. Header. Clearly identify it as a proforma invoice.
  2. Supplier details: company name, address, tax ID, and contact information.
  3. Client details.
  4. Invoice number. Although it doesn’t have to follow the same numbering as official invoices, we advise assigning a number for tracking purposes.
  5. Date of issue.
  6. Description of products or services. Detail the goods or services with quantities, unit prices, and total prices.
  7. Terms of sale. Include payment terms, discounts, delivery dates, etc.
  8. Taxes. Even though they don’t have tax implications, it’s advisable to reflect taxes so the client understands the final cost.

Furthermore, we insist: check that the proforma invoice clearly indicates in the header that it is a preliminary document and not a final invoice. This way, you avoid confusion with the other party.

Proforma Invoice Template

To make it clearer, here we present a simplified proforma invoice template:simplified:

Item
Details

Header
Proforma Invoice

Supplier
Yourbusiness S.L. – Tax ID: 12345678A

Client
Theclient S.A. – Tax ID: 87654321B

Invoice number
PRO-0001

Issue Date
08/10/2024

Description
Consultancy service

Quantity
10 hours

Unit price
€100

Total
€1,000 + VAT

Advance payment on the proforma invoice

On the other hand, and although we have already mentioned them, we delve into an aspect to discuss due to its importance, which is the advance payment of proforma invoices.

In large-scale projects or when the commercial relationship with a client is new, the seller may request, along with the proforma, full advance payment or a percentage of the total before providing the service or product. Why? Because it is a method with several advantages:

  • The company secures the client’s commitment.
  • The issuing company obtains financial resources to cover initial costs of production or acquisition.
  • For the client, the proforma is a guarantee that they will receive the products under the agreed conditions.

For all these reasons and what has been stated in the article, it is a very valuable tool in commercial management. Especially in international trade and sales processes with a formal prior quotation. Although it lacks fiscal validity and does not imply immediate payment obligations, its functions are very useful in the negotiation phase and, at the same time, it facilitates advance payment.

In summary, understanding what a proforma invoice is and what it is for improves your sales processes, minimizes misunderstandings with clients, and optimizes cash flow, if there is advance payment. EasyAP’s software easyap is ideal for facilitating the management of these documents, with total traceability and efficiency. What your company needs to face the challenges of the modern business environment. Shall we show you?

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