Invoice

Why it matters in a negotiation

An invoice charges for a service already delivered; a quote only proposes a price. Confusing them delays payment and complicates the bookkeeping on both sides.

How it is used

Number invoices consecutively, include tax details for issuer and recipient, the taxable base, the taxes and the payment terms. Issue it on the delivery date, not when the brand remembers to ask for it.

A case with figures

Quote on the 3rd, delivery on the 20th and invoice on the 20th with 30-day terms: the money arrives on the 20th of the following month. That delay is part of the price too, and it is negotiated beforehand.

Where it gets confused with other terms

A quote proposes a price; an invoice claims one you have already earned. The quote creates no tax obligation, the invoice does: sequential numbering, both parties' details, taxable base, taxes and payment terms. The second border is VAT, which the invoice does not "add" for you to keep — it passes it on. A $1,000 all-in quote and a $1,000 invoice plus 21 % VAT end up at $826 of real income for the same work.

Figures from the 2026 report

A $1,000 campaign in Spain is invoiced with 21 % VAT and 15 % withholding if you work as a professional: 1,000 + 210 − 150 = $1,060 reaching your account, with 210 going to the tax office. If payment is Net 30, that money arrives 30 days after issuing. Each of those three numbers — VAT, withholding and term — is negotiated before signing, not when the invoice goes out.

Where the figure comes from

The mandatory invoice fields and the withholding rule come from the Spanish invoicing regulation (RD 1619/2012) and the tax agency's yearly instructions. The invoicing sponsorships and taxes guide walks the full circuit — quote, delivery, invoice, due date — and the site's legal notice lists the owner's tax details.

How to check it in your account

1. Before issuing, cross three fields with the accepted quote: reference, concept and amount. If the purchase order carries a number, that number goes in the reference field; without it, finance sends the invoice back and the clock restarts.
2. Check that the numbering follows the year's series with no gaps. A jump with no credit note to explain it is the first thing an accountant asks about and the last thing a phone call fixes.
3. File the proof of sending and the acknowledgement of receipt. The acknowledgement date, not the email date, starts the payment term, and it is what turns a friendly reminder into a dated claim.
4. If the brand asks for the invoice 'in the agency's name', confirm the tax ID and the fiscal address in writing before issuing. Changing the recipient afterwards forces a credit note and a new invoice, and the term restarts.
5. Check that the bank account and the account holder match the invoice. A change of account with no signed document is the signal that parks a payment in compliance for three weeks.

The line in the quote

A 540 campaign splits into base, tax and, where applicable, withholding; the total the brand sees is the sum, not the base. If you add a 90-day right, the new line carries its own concept (810) and the invoice keeps the same reference as the quote. Invoicing in another currency means stating the rate and the date on the document itself, not in the email that goes with it. The most expensive presentation mistake is not the amount: it is invoicing the base without tax and having the brand pay that figure as the total. The mismatch surfaces in the quarterly reconciliation, once the month is closed and you have to explain why a percentage you never charged is missing. If payment arrives in two transfers, mark the invoice as paid only when the sum matches; noting it avoids chasing a part that already landed.

A case that went wrong

An invoice with the wrong tax was fixed by editing the PDF and sending it again. Months later the brand held two versions of the same number and the accountant asked for the original; the credit note that was never issued turned a five-minute error into an unbalanced quarter and an awkward conversation with whoever approved the payment. The right fix was a credit note for the full amount and a new invoice with the next number, keeping both versions: ten minutes of work and a trail any accountant accepts without asking.

Red flags in the proposal

Lines that show up in a sponsorship proposal and how to answer them when they concern this term.

• "We need the invoice next month"

  The invoice is issued on delivery: delaying it to fit the brand's month-end extends your payment with no benefit to you. If they insist, keep the email with the request and the delivery date: the payment term runs from issuing, not from their preference.

• "Invoice us without VAT, we're abroad"

  Without a valid client VAT number, VAT applies anyway. Ask for the number, check it in VIES and, if they do not have one, invoice with VAT: otherwise you pay it out of your margin.

• "Our process is 90 days"

  The term is not a law of physics: it is a commercial condition. If they keep it, raise the price or ask for a deposit; if there is room for neither, it is a campaign that finances the brand, not you.

In the calculator

Every amount can be closed with taxes, discounts and usage rights before it becomes a quote or an invoice. The PDF keeps the numbering and the terms you agreed with the brand.

How your rate is calculated

The engine starts from the estimated impressions, applies the CPM of the platform and the niche, adjusts for engagement and for audience location, and adds the multipliers for usage rights, exclusivity and number of deliverables. The result is three figures —floor, suggested and premium— with the full breakdown before you export the quote.