What is a pro forma invoice, and when should you use one?

A pro forma invoice is a preliminary bill sent before goods ship or work begins. It shows the buyer what the sale will cost, line by line, and asks for nothing yet: no payment is due, and no entry lands in either side's books.

This guide covers how a pro forma invoice differs from a standard one, when businesses actually use them, what to include, and how the estimate-to-invoice workflow removes the retyping.

Key takeaways

• A pro forma invoice previews a sale before it is final. It requests no payment and creates no accounting entry.
• The common uses: formalizing a quote, supporting a buyer's internal approval, setting up a deposit, and starting paperwork on international shipments.
• Once the buyer approves, the pro forma converts into a standard invoice, ideally without re-entering a single line.
• Bluevine Estimates handles this workflow inside business checking: send the estimate, get approval, and convert it to an invoice in one click.

Pro forma invoice vs. standard invoice

The two documents can look nearly identical. The difference is what they ask for and when they arrive.

A useful shorthand: a proforma invoice describes what a purchase would cost. A standard invoice states what a purchase does cost, and it starts the payment clock.

The numbering row matters more than it looks. If pro formas share your invoice sequence, your books show gaps wherever a deal changed or fell through, and your accountant spends December asking about invoices that never existed. Give them their own prefix, such as PF-001, and the sequence stays clean.

When businesses use pro forma invoices

• To formalize a quote. A verbal estimate becomes a structured document with line items, which removes ambiguity about what the price includes. The buyer sees the same layout the final invoice will have.
• To support the buyer's approval process. Many companies need a document in hand to raise a purchase order or get budget sign-off, well before any binding invoice exists. The pro forma is that document.
• To set up a deposit. The pro forma states the full cost of the job, and the deposit terms reference it, so both sides agree on the whole before money moves on the part.
• On international shipments. Buyers, banks, and freight forwarders often want a value declaration early. For customs clearance itself, the commercial invoice is the document of record; the proforma gets things moving while final details are settled.

In all four cases the job is the same: put the full picture in front of the buyer while changes are still cheap.

The deposit case deserves one more sentence, because it is where service businesses most often get burned. A contractor who starts a kitchen remodel on a verbal number has no document to point at when the scope grows. A pro forma sent before the first day on site fixes the reference point, and the deposit invoice, the progress bills, and the final invoice all trace back to it.

What to include on a pro forma invoice

Mirror the structure of a standard invoice, so nothing has to change at conversion time:

• Your business details and the buyer's details
• The label "Pro forma invoice," stated clearly, so nobody processes it as a demand for payment
• An expiration date for the pricing
• Line items with descriptions, quantities, rates, and amounts
• Subtotal, estimated tax, and total
• Expected delivery or completion timing, plus the payment terms that will apply once it becomes an invoice

The expiration date does quiet work here. Prices move, and an open-ended proforma from March can resurface in July with an expectation attached.

On international sales, add the currency, the shipping and insurance treatment, and the harmonized codes if your freight forwarder asks for them. Mark every tax and duty figure as an estimate. Final amounts on cross-border shipments routinely shift between quote and delivery, and the document should say so.

The elements themselves are covered in more depth in our guide to making an invoice, and the terms in invoice payment terms.

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From estimate to invoice

In most day-to-day service businesses, the pro forma workflow goes by a simpler name: estimates. The sequence stays the same. Align on scope and price in writing before work starts, get the buyer's approval, then convert the approved document into a real invoice.

The conversion step is where manual workflows leak. Retyping line items from an approved quote into a fresh invoice introduces exactly the discrepancies the pro forma existed to prevent, and a $95 rate that becomes $59 in the retype will be noticed by precisely one party.

With Bluevine Estimates, that whole path lives in the Business Checking dashboard:

• Create the estimate. Add your customer, products or services, discounts, and service charges. Plus and Premier customers can add custom fields.
• Send it for approval. Deliver by email, link, PDF, or SMS, with automatic reminders if it sits unanswered.
• Convert in one click. Once approved, the estimate becomes an invoice with no re-entry of details.
• Get paid. Connect a Stripe account to accept card, digital wallet, or ACH direct debit payments, or take in-person payment with Tap to Pay right from your phone.

Sending estimates and invoices is free and unlimited; processing fees apply only when a customer pays through Stripe.

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The bottom line

A pro forma invoice puts the full cost in front of the buyer while there is still time to adjust. Structure it like the real invoice, label it clearly, give the pricing an expiration date, and make the conversion effortless when the yes arrives.

Align on price before the work starts

Open a Bluevine Business Checking account to send professional estimates and convert them to invoices in one click.

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