Paid Invoice: The Complete Guide to Proof of Payment 2026

Updated March 2026 - In the whirlwind of managing a VSE or SME, an invoice is often put away as soon as it is "ordered". However, an accounting document only reaches its legal fullness once it becomes a paid invoice.

More than a simple mention of use, the acquit is the cornerstone of your financial and tax security. In 2026, as electronic invoicing becomes established and controls on cash flow tighten, mastering this concept is essential to protect your rights and optimize your cash flow.

A paid invoice is an original invoice on which the supplier (creditor) certifies in writing that he has received full payment of the amount due. It transforms a debt into a receipt. Legally, it proves the extinction of the debt within the meaning of the Commercial Code.

Mandatory Information for total validity

To be enforceable against the administration or a court, the receipt cannot be limited to a simple signature. It must include:

1. ▸The explicit mention: “Acquitted”, “Paid” or “Received in payment”.
2. ▸Payment method: SEPA transfer, Check (recommended check number), Bank Card or Cash (within the legal limit of €1,000).
3. ▸The settlement date: Exact moment when the funds were made available.
4. ▸Identification: Signature of the supplier and commercial stamp of the company.

[!TIP] In 2026, if you use digital management tools, some systems automatically generate a digital receipt. Make sure it includes the transaction URL or payment ID for perfect traceability.

A. VAT recovery (Services)

This is the most critical point. For the provision of services, VAT is only deductible at the time of actual payment (VAT on receipts). If you deduct VAT when you receive the invoice without proving that it is paid, the tax authorities may reject your deduction during a VAT audit. The paid invoice is your shield.

B. The release of public subsidies

Whether for aid from the Île-de-France Region, a BPIfrance system or subsidies linked to the ecological transition, funding organizations never act on a simple invoice. They demand proof of acquittal. They want to have mathematical certainty that you committed the funds before reimbursing you for the subsidized portion.

C. The Research Tax Credit (CIR (French R&D tax credit)) and Innovation (CII (French innovation tax credit))

For subcontracting expenses eligible for the CIR, the administration systematically checks that the service providers' invoices were paid during the year of the declaration.

Many entrepreneurs think that a bank statement is enough to prove payment. This is a risky mistake.

• ▸The statement proves that an amount has left your account.
• ▸The paid invoice proves that this precise sum corresponds to this precise accounting transaction.

In the event of a commercial dispute, if a supplier sues you for unpaid debt, their lawyer could argue that the transfer noted on your statement corresponded to another debt. Only the receipt affixed to the invoice by the supplier itself definitively closes the file.

In 2026, the law requires the retention of accounting documents for 10 years. But preserving is not enough: we must prove the reality of the exchange. The paid invoice is part of what is called the Reliable Audit Trail. It allows you to chronologically link the purchase order, the delivery note, the invoice and the bank flow.

A Parisian startup invests €100,000 in new machines. She is counting on a grant of €30,000 to pay her end-of-year salaries. The administration refuses the file because the invoices are marked "Paid" but without signature or date. The startup takes 3 weeks to obtain the correct documents from its foreign suppliers. In the meantime, the cash flow is in the red. Morality: Check the conformity of the receipt the second you receive the document.

• ▸The supplier refuses to pay the invoice, what should I do? If he has been paid, he is obliged to issue a receipt (Art. 1353 of the Civil Code). A bank transfer accompanied by your reminder email can serve as the beginning of proof, but receipt remains ideal.
• ▸Is an invoice stamped "Paid" by my accountant valid? No. It is the creditor (the one who receives the money) who must certify the payment. Your own stamp has no evidentiary value vis-à-vis the tax authorities.
• ▸And in the case of split payment? We speak of "paid deposit". Each payment must generate a certificate of the amount received to date.

The acquit is not a boring administrative formality; it is your guarantee of legal security and the key to your financial aid. Never leave a major expense without its correct paid invoice.

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(Official sources: Commercial Code Article L123-22, Civil Code Article 1353, BOI-TVA-DECLA-30-20-20)