In April Elena discovers that an invoice from February applied the wrong VAT. The client has already received the document and the first quarter has been filed. She must not edit the PDF or reuse the number. If the error affects compulsory details, the base, the rate or the VAT, she issues a corrective invoice (factura rectificativa) in its own series, identifying the original and explaining the reason. Then she corrects the books and decides whether a supplementary return, a corrective self-assessment or a request for correction is the right route.
Correcting does not make the original disappear
The original invoice keeps its audit trail. The corrective invoice documents the difference or the corrected position. It can state the amount of the correction directly, positive or negative, or show the correct result, provided the method is clear.
| Error | Usual action |
|---|---|
| Wrong name, tax number or address | Corrective invoice for the details |
| Wrong base, discount, rate or VAT | Corrective invoice with an economic effect |
| A later return of goods or cancellation | Corrective invoice for the change |
| Duplicated invoice | Corrective invoice that cancels the duplicate, keeping the trail |
| A draft that was never issued | Can be replaced before it is issued |
Creating another ordinary negative invoice with no reference, changing the PDF while keeping the number, or leaving a gap in the series makes it hard to show what happened. The corrective invoice must be issued as soon as you know of the error, within the legal limits.
What happens in Modelo 303
The treatment depends on whether the error made you pay too little, pay too much or declare a balance wrongly. Since the third quarter or September of 2024, many errors in the 303, the Spanish VAT return, are corrected through the form itself by ticking "Autoliquidación rectificativa" (corrective self-assessment) and identifying the earlier return.
If the error meant paying less VAT, or declaring a higher balance to carry forward or refund than was correct, the relevant correction is filed, and a surcharge and interest may apply if it comes late. Waiting for the next quarter without a legal basis does not repair the original period.
There is an important exception: when you have charged another taxpayer more VAT than was due and the correction involves amending the invoice, the Agencia Tributaria states that the corrective self-assessment is not used automatically; any correction requires a request for correction. This difference prevents VAT the issuer may have collected from the client being returned to the issuer without first checking that it has been repaid to the client and that the requirements are met.
Charged 210 € where 100 € was due
You issue an invoice for 1,000 €, applying 21 % by mistake: 210 € of VAT. After reviewing the transaction you conclude that 100 € was due. The corrective invoice reduces the VAT by 110 € and must be sent to the client. If the client is a business and deducted the 210 €, it must adjust its deduction as well. The route for recovering your excess should not be decided just by adding −110 € to the next 303: the specific procedure for VAT charged in excess has to be followed.
If the error went the other way and you had charged 100 € when 210 € was due, the corrective invoice increases the VAT by 110 €. The return for the period affected must then be corrected under the rules in force.
The record books must tell the same story
Enter the corrective invoice in the book of invoices issued, with its series, date, recipient, base and VAT. Keep the original, the corrective invoice, proof that it was sent and the reason. If the error arose from a return of goods or a contractual change, keep the credit note, agreement or document that proves it.
A corrective invoice is not the tool for recovering an invoice that has simply not been paid. In that case, as well as correcting, you must meet the waiting period, the claim and the notification required by article 80 of the Spanish VAT Act (LIVA); see how to recover VAT from a client who does not pay.
Withholding and income tax can be affected too
If the invoice carried professional withholding (the income tax a Spanish business client deducts from a professional's fee and pays in on their behalf), the correction may change the amount the client should have paid in and declared. Tell the client, so that its returns and your annual certificate match. For income tax, correct the income of the period and keep the explanation; do not confuse the net amount in the bank with gross income.
Before filing anything, answer four questions: which detail was wrong, when the transaction accrued, whether the 303 has already been filed and whether the client deducted or paid the VAT. That sequence determines the document and the route. If the adjustment leaves a balance in your favour, also review the options to carry it forward or claim a refund.
Errors that do not change the amount
A wrong tax number, an incomplete address or a description that does not identify the service may require correction even if the VAT does not change. The new document states the correct detail and keeps the reference to the original. If there is only a typo that does not affect a legal requirement, first consider whether correction is needed at all: generating unnecessary documents also creates mismatches.
A wrong date can change the VAT period. Correcting it on paper without reviewing when the tax accrued leaves two stories that cannot both be true. You reconstruct when the service was provided, whether there was an advance, or when the goods were made available. You can send the invoice, the period and the status of the 303 through the self-employed form.
Credit notes, returns and later discounts
If the price changes afterwards because goods are returned, the contract is terminated or a discount is given, the corrective invoice documents a later change, not an original error. Keep the commercial agreement, the delivery note or proof of the refund.
| Situation | Supporting document |
|---|---|
| Goods returned | Delivery note and credit to the client |
| Later discount | Agreement and how it was calculated |
| Service cancelled | Termination of the contract and the refund |
| Insolvency | The claim and the procedure under article 80 LIVA |
A client who does not pay does not make the service non-existent. No fictitious commercial credit note should be issued to get around the requirements for bad debts.
When the mistake is on an invoice you received
The recipient does not alter the supplier's document. Ask for a corrective invoice and adjust the book and the deduction. If you deducted more VAT than was correct, review the 303 affected; if you deducted less, check the route and the time limit for exercising the right.
Paying the correct amount does not, on its own, fix the invoice either. Hacienda, the tax office, cross-checks document, record and return. Keep the email in which you asked for the correction and do not double the deduction by recording both the original and the corrective invoice.
Checklist before you close the correction
Check its own series, consecutive numbering, the reference to the original, the reason, the amounts, the date, proof of sending and the book entry. Then reconcile the change with the 303 and, if there is withholding, with the payer's returns and certificates.
A correction affects both parties. Telling the client allows both to adjust the VAT charged and borne consistently; proof of receipt stops the issuer recovering VAT while the recipient keeps an excessive deduction.
If the client rejects the corrective invoice
Rejection does not authorise you to delete the transaction. Keep what you sent, the reply and the grounds for the correction. If the price or the service is in dispute, separate the contractual dispute from the duty to invoice. A corrective invoice based on a termination that never happened can be as wrong as the original invoice.
When the error favours the client and the client has already deducted the original VAT, telling them matters even more. If the disagreement persists, review the appropriate tax and civil procedure before changing returns in ways that contradict each other.
Series and invoicing systems
Set up a specific series for corrective invoices and block silent editing of issued invoices. The system must keep the date, user and version. If you migrate software, import the links between originals and corrective invoices too; an isolated PDF does not always preserve that trail.
At Salama Tax we review the invoice and the return affected so that the documentary correction and the tax correction match.