--- title: "A customer pays the net amount: understanding the VAT shortfall" canonical: https://www.billabex.com/en/blog/customer-pays-net-amount-vat-shortfall/ lang: en alternate: https://www.billabex.com/fr/blog/client-paie-hors-taxes-ecart-tva.md updated: 2026-09-28 index: https://www.billabex.com/llms.txt --- # A customer pays the net amount: understanding the VAT shortfall The transfer received exactly matches the invoice amount excluding VAT. The explanation looks obvious: the customer forgot the tax. Yet that arithmetic match is not enough to choose the right reminder. It could reflect a data entry mistake, confusion about input VAT deduction, a valid challenge to the tax treatment or a credit note already included in the customer's calculation. Before requesting the difference, establish why that amount was selected for payment. The method below concerns French invoices and distinguishes the displayed amount, money received and tax treatment applicable to the transaction. It cannot automatically classify every sale across Europe. The objective is to send a precise question to the appropriate person and then give the customer an answer reflecting the verification performed. An accurate collections response sometimes begins by correcting the supplier's own invoice rather than requesting additional funds immediately. ## Recognise a numerical match without assuming its cause Compare the payment with the invoice columns: amount excluding VAT, tax, gross total and remaining balance after recorded movements. Also verify that the transfer actually relates to that invoice. When it matches the net amount, record “receipt equals the amount excluding VAT” as an observation. Avoid converting that observation into “customer refuses to pay VAT” until the relevant person has confirmed the reason for the amount paid. Consider an initial fictional example: a service invoiced at €8,000 excluding VAT, with €1,600 tax assumed applicable, giving €9,600 including VAT. The standard **20%** rate exists in mainland France, although not every transaction falls within it. [French Ministry of Economy, VAT rates](https://www.economie.gouv.fr/particuliers/impots-et-fiscalite/gerer-mes-autres-impots-et-taxes/tva-quels-sont-les-taux-de-votre-quotidien). If €8,000 arrives, the initial difference is €1,600. That calculation does not yet establish a payable balance. Check for a credit note, earlier payment or billing error. [Reviewing credit notes and their allocation](https://www.billabex.com/en/blog/unallocated-credit-note-balance-check/) prevents a coincidence with the VAT amount from becoming an unjustified request. The working balance should reflect all relevant movements rather than only the invoice total and latest bank transfer. ## Ask for the reason and the document used for payment Send a concise question to the person preparing payments. Ask which invoice version was used and whether the €8,000 reflects entry of the net figure, a particular tax treatment or an expected correction. You are seeking a verifiable explanation, not an admission of fault. An answer such as “this is our procedure” may require their accounting manager to identify the rule they believe applies to the transaction. A working message could say: “We have allocated your €8,000 payment to the relevant invoice, which shows a €9,600 total including VAT. The amount received matches the net value. Could you confirm the document and treatment used for this payment? We will check whether an additional payment or an invoice correction is required before confirming the remaining balance.” Adapt the references and figures to the actual account rather than copying them unchanged. This acknowledges the money received and avoids requesting the full invoice again. It also leaves room for an error on the supplier's side. If the customer already explained their position in another thread, gather that response before asking again. The [division of responsibility across operations, finance and sales](https://www.billabex.com/en/blog/invoice-dispute-decision-owner/) helps identify who should answer the substantive question and who needs to supply the supporting contract or billing records. ## Separate input VAT deduction from reducing a supplier payment A customer may think recovering VAT means paying only the net amount. France's tax authority describes deduction as a tax mechanism, subject to conditions and recorded through the VAT return. That mechanism does not by itself replace payment of a correctly issued gross invoice for an ordinary taxable transaction. [DGFiP, input VAT deduction](https://www.impots.gouv.fr/professionnel/questions/comment-deduire-la-tva-sur-mes-achats). Explain the distinction without promising the customer they can recover all the tax. Their entitlement depends on their situation and transactions. Your team can confirm the treatment of the invoice it issued; it does not need to approve the customer's entire VAT return. If the invoice is confirmed correct and no other adjustment applies, the conversation can then focus on the identified additional amount and when it will be paid. In our example, the verified response can state a €9,600 gross invoice, €8,000 received and €1,600 remaining. Keep that same reconciliation in the account record, message and follow-up. If the customer proposes paying the difference later, record a promise against the remaining balance. Do not retrospectively change the invoice value or describe the VAT as a new service that has now been sold to the customer separately. ## Examine a reverse charge explanation before rejecting it Some payments excluding supplier-charged VAT are consistent with the applicable regime. Service Public explains that certain French subcontracted construction work falls under reverse charge: the subcontractor does not charge VAT to the contractor and includes the appropriate wording. The customer's industry alone is insufficient; the work and subcontracting relationship matter. [Service Public, construction reverse charge](https://entreprendre.service-public.gouv.fr/vosdroits/F31983). If the customer raises that situation, send the contract, service description and invoice to accounting. Do not conclude either that all construction customers pay net or that the VAT must be correct because the billing application added it. An incorrect configuration may affect several invoices. The useful decision is to classify this transaction and then check whether comparable documents require the same correction, rather than settle each difference through an unexplained adjustment. In a second fictional branch, assume accounting confirms an applicable reverse charge and €1,600 VAT incorrectly invoiced. The €8,000 already received may then represent the amount payable to the supplier after the appropriate correction. That outcome is not a €1,600 commercial discount. It reflects correction of the tax treatment and must follow the documentary and accounting procedure established for the particular circumstances of the case. ## Correct the invoice rather than simply erase the balance BOFiP explains that VAT wrongly shown on an invoice can make its issuer liable, with correction subject to conditions. It identifies, in particular, a corrective invoice sent to the customer before adjustment with the tax authority. Deleting a remainder in a collections application therefore does not perform that correction. [BOI-TVA-DECLA-30-20-20-30, paragraphs 350 to 380](https://bofip.impots.gouv.fr/bofip/1531-PGP.html/identifiant=BOI-TVA-DECLA-30-20-20-30-20250108). The authorised person should establish the corrective document, accounting treatment and customer explanation. Preserve the connection between the original invoice, correction and money already received. Do not create another €8,000 request as though no payment had occurred. Equally, do not describe disappearance of the remainder as a new receipt: no additional money enters the business in this branch of the example. The resolution needs to preserve both the cash history and the reason for changing the balance. If the treatment remains uncertain, show that the additional amount is under review, with an owner and a date for the next response. Holding the request for that particular difference is clearer than marking the whole account paid without support. It does not prevent work on other invoices whose balances and tax treatment have been verified separately. The scope of the hold should be understandable to anyone handling the next customer conversation. ## Close the difference with a useful cause Retain the reason when closing the case: entry error resolved by additional payment, confusion about deduction, tax correction or an existing credit note. Those causes require different preventive actions. One may justify a clearer document, another an explanation, and another a billing configuration review. A single “VAT difference resolved” reason would lose that distinction and make recurrence harder to diagnose when the same customer or invoice type appears again. For cash forecasting, distinguish an expected additional payment from a correction without new cash. The calculation of [cash available after French VAT](https://www.billabex.com/en/blog/vat-on-receipts-available-cash/) then answers a separate question: what remains usable once funds arrive. [Billabex's collections conversations](https://www.billabex.com/en/product/follow-ups-conversations/) bring the relevant exchanges together for follow-through. The right conclusion may be an additional amount to collect or an invoice to correct; it must follow verification of the transaction, rather than the numerical match between a transfer and the amount excluding VAT. ## Sources - French Ministry of Economy, 11 December 2025: [standard VAT rate in mainland France](https://www.economie.gouv.fr/particuliers/impots-et-fiscalite/gerer-mes-autres-impots-et-taxes/tva-quels-sont-les-taux-de-votre-quotidien). - DGFiP, 5 March 2026: [input VAT deduction mechanism and conditions](https://www.impots.gouv.fr/professionnel/questions/comment-deduire-la-tva-sur-mes-achats). - Service Public, 7 July 2023: [reverse charge for certain subcontracted construction work](https://entreprendre.service-public.gouv.fr/vosdroits/F31983). - BOFiP, 8 January 2025, paragraphs 350 to 380: [incorrectly invoiced VAT and correction](https://bofip.impots.gouv.fr/bofip/1531-PGP.html/identifiant=BOI-TVA-DECLA-30-20-20-30-20250108).