Corrective invoices in the National e-Invoicing System (KSeF) in Poland – what will change in VAT corrections?

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Corrective invoices in the National e-Invoicing System (KSeF) in Poland will change the way businesses issue, deliver and account for VAT corrections. Once a taxpayer becomes subject to mandatory structured invoicing, a correction relating to an invoice covered by KSeF will no longer be only a document sent to the contractor by e-mail or as a PDF file. As a rule, it will be an invoice issued and made available through KSeF, subject to the exceptions provided for specific types of documents and transactions. This change has significant practical importance. Corrective invoices are used in the day-to-day operations of many companies, especially in cases such as:

• returns of goods,
• complaints,
• post-sale discounts,
• pricing errors,
• changes in buyer details,
• corrections of the quantity of products sold.

Mandatory use of KSeF is being introduced in stages. From 1 February 2026, the system applies to taxpayers whose sales value, including tax, exceeded PLN 200 million in 2024. From 1 April 2026, the obligation to issue invoices in KSeF applies to other taxpayers, subject to statutory exceptions. Until the end of 2026, taxpayers whose sales documented by invoices in a given month do not exceed PLN 10,000 gross may benefit from a deferral. From 1 February 2026, structured invoices are issued using the FA(3) logical structure, which also covers corrective invoices. For businesses, this means the need to organise sales, accounting and tax processes. This will be particularly important for companies that:

• issue large numbers of documents,
• conduct B2B sales,
• operate in e-commerce,
• operate in Poland as foreign entities.

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Why do corrective invoices in KSeF require preparation?

A corrective invoice is not an exceptional document. In many companies, it is a natural part of the sales document flow. It may result from an error, but also from the normal course of a transaction, such as the return of goods or the granting of a discount after the sale. Until now, the correction process was often fragmented. The sales department agreed the change with the contractor, customer service handled the complaint, the warehouse confirmed the return of goods, and accounting issued the document and sent it by e-mail. After the implementation of KSeF, this model will require greater control. A corrective invoice will have to be prepared in the correct structure, sent to KSeF and accepted by the system. Merely generating a document in an internal system will not yet mean that the correction has been effectively issued as a structured invoice. In practice, companies should therefore prepare on two levels:

1. Technical level – systems, integration, data structure and submission statuses.
2. Tax and organisational level – reason for the correction, business documentation, correct settlement period and responsibility for approving the document.

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When should a corrective invoice be issued?

The basic rules for issuing corrective invoices result from the Polish Value Added Tax Act. A correction is required when, after the original invoice has been issued, its content changes, in particular the taxable base, the amount of VAT or the data shown on the invoice. In practice, corrective invoices are most often issued in the case of:

• return of goods,
• accepted complaint,
• post-sale discount,
• pricing error,
• incorrect quantity of goods,
• incorrect VAT rate,
• error in buyer details.

KSeF does not change the reasons for issuing a corrective invoice. It is still necessary to determine why the original invoice does not reflect the actual course of the transaction. What changes is the way the correction is documented and exchanged between the parties. The abolition of correction notes is also important. Under the mandatory KSeF model, errors that could previously be corrected by the buyer using a correction note will require a corrective invoice issued by the seller. This means greater responsibility for the seller for the quality of data already at the order acceptance and original invoice issuing stage.

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How does the National e-Invoicing System (KSeF) in Poland change the circulation of corrective invoices?

KSeF moves the circulation of corrective invoices into a central system. The document will no longer function only as a file sent to the contractor, but as a structured invoice whose status can be verified in the system. In practice, the process looks as follows:

1. Preparing the correction in the company’s system.
2. Sending the document to KSeF.
3. Validation by the system.
4. Acceptance by KSeF and assignment of an identifying number.

From the accounting perspective, it is important to distinguish between two moments. A structured invoice is deemed to be issued on the date it is sent to KSeF, while it is deemed to be received using KSeF on the date the system assigns its identifying number. Therefore, in practice, a company should monitor both the submission of the document and its acceptance, including the assignment of the KSeF number. This is particularly important when closing accounting periods. If an invoice is prepared on the last day of the month but is not effectively accepted by KSeF, problems may arise with its correct recognition for VAT and accounting purposes. For this reason, companies should implement procedures for monitoring document statuses. This means checking not only whether the invoice has been sent, but also whether it:

• has been accepted,
• has received a KSeF number,
• has not been rejected due to a technical error or incorrect data.

It is also worth considering the broader aspect of document control. KSeF organises the circulation of invoices, but it does not release the entrepreneur from the obligation to verify them. This issue is discussed more broadly in the article on National e-Invoicing System in Poland (KSeF) and scam invoices: why document control is essential. This context is also relevant for corrective invoices, because every correction should be linked to a real business event, not merely to the appearance of a document in the system.

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The moment of issuing and receiving a correction

One of the most important practical changes is the significance of the moment when an invoice is issued and received in the National e-Invoicing System in Poland (KSeF). As a rule, a structured invoice is deemed to be issued on the date it is sent to KSeF. It is deemed to be received using KSeF on the date on which the system assigns its identifying number. For corrective invoices, this matters both for the seller and the buyer. The entrepreneur should therefore monitor not only the date shown on the invoice, but also the document status in KSeF. In accounting practice, the effective acceptance of the document by the system may be decisive for further accounting actions. This aspect is particularly important for companies that issue corrections on a mass scale, such as:

• e-commerce stores,
• distributors,
• manufacturing companies,
• marketplace operators,
• businesses using automated invoicing processes.

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FA(3) structure and corrective invoices

From 1 February 2026, the applicable structured invoice format is the FA(3) logical structure. This structure covers different types of invoices, including corrective invoices, advance payment invoices and settlement invoices. For the entrepreneur, this means that the correction must be correct not only from a tax perspective, but also from a technical perspective. The system should correctly indicate:

• the original invoice,
• seller and buyer details,
• the reason for the correction,
• the correct values.

Not every company needs to analyse the XML structure at a technical level. However, every company should make sure that its accounting or sales system supports the required correction scenarios. Particular attention should be paid to:

• collective corrections,
• discount corrections,
• corrections to advance payment invoices,
• automatically generated corrections.

An error in the structure may result in the document being rejected by KSeF. In such a case, the corrective invoice should not be treated as effectively issued in the system.

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In minus corrections in KSeF

Corrective invoices in minus reduce the taxable base or the amount of VAT. In practice, they most often relate to:

• returns of goods,
• accepted complaints,
• post-sale discounts,
• refund of part of the payment.

KSeF organises the technical circulation of such documents. Once the corrective invoice has been accepted by the system, the entrepreneur has confirmation that the document has been made available to the buyer in KSeF. However, this does not mean that the need to document the reason for the correction disappears. KSeF confirms the circulation of the invoice, but it does not replace business arrangements between the parties. For in minus corrections, it is still necessary to demonstrate the reason for reducing the taxable base. This may include:

• an agreement or sales terms and conditions,
• correspondence with the contractor,
• complaint decision,
• confirmation of return of goods,
• documentation of a rebate programme.

In practice, it is best for correction documentation to be available within one process together with the original invoice, the corrective invoice and information on the document status in KSeF. This facilitates both current settlements and subsequent tax explanations.

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In plus corrections in KSeF

Corrective invoices in plus increase the taxable base or the amount of VAT. They may result from:

• an error that already existed when the original invoice was issued,
• new circumstances that arose after the sale.

This distinction is crucial for the settlement period:

Reason for correction	Settlement rule
The reason existed when the original invoice was issued, for example an understated price, incorrect quantity or incorrect VAT rate	The correction may require retrospective settlement
The reason arose only after the sale, for example additional remuneration or a change in the scope of the service	The correction is generally settled on a current basis

KSeF does not change this logic. The mere issuing of a corrective invoice in the system does not determine whether the correction should be recognised retrospectively or currently. The decisive factor remains the reason for the correction and the moment when it arose.

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Does a corrective invoice in KSeF require buyer acceptance?

In practice, entrepreneurs often ask whether a corrective invoice in National e-Invoicing System (KSeF) in Poland requires buyer acceptance. The answer depends on what is meant by acceptance. KSeF changes the technical aspect of delivering the document. Once the invoice has been accepted by the system and assigned a KSeF number, the document is made available to the buyer in the system. Therefore, the entire process no longer has to rely solely on e-mails, PDF files or confirmations of receipt. This does not mean, however, that a correction may be issued without a business basis. Especially for in minus corrections, it remains important to have:

• agreed conditions for reducing the price or taxable base,
• actual fulfilment of those conditions.

For this reason, it is advisable to clearly describe correction rules in:

• B2B agreements,
• sales terms and conditions,
• complaint procedures,
• rebate programmes.

The more precise the cooperation rules are, the easier it is to demonstrate that the correction was justified.

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Access to KSeF and handling corrections

Issuing corrective invoices in KSeF requires not only the right system, but also properly granted access rights. In practice, a company should know:

• who may issue invoices,
• who may send them,
• who downloads purchase documents,
• who is responsible for monitoring statuses.

A lack of organised permissions may lead to delays, errors or situations in which a document is prepared but not effectively submitted to the system. This is particularly important when a correction must be recognised in a specific settlement period. Access to KSeF should therefore be treated as part of the tax procedure, not only as a technical issue.

Practical guidance on this topic is provided in the article: How to log in to the National e-Invoicing System (KSeF) in Poland and avoid access issues? A guide for entrepreneurs.

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Process for issuing a corrective invoice in KSeF step by step

Correct handling of a correction should follow these steps:

1. Determine the reason for the correction – return, complaint, discount, pricing error, incorrect quantity of goods, incorrect VAT rate or error in buyer details.
2. Assess the tax consequences – for in minus corrections, confirm the basis for the reduction; for in plus corrections, determine whether the reason existed when the original invoice was issued or arose later.
3. Prepare the corrective invoice in the system and send it to KSeF.
4. Check the document status – if rejected, determine the reason, correct the document and resubmit it.
5. Recognise the correction correctly in VAT and accounting books – this stage requires cooperation between sales, customer service, warehouse, accounting and tax teams.

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Practical examples

Return of goods by a B2B contractor

If a contractor returns part of an order, the seller issues an in minus corrective invoice. The basis for the correction is the return of goods and the resulting reduction in remuneration. In such a situation, it is worth ensuring that the company has:

• confirmation of accepting the return,
• warehouse document,
• information about the refund or set-off.

The corrective invoice should be linked to the original invoice and properly submitted to KSeF.

Post-sale discount

A post-sale discount requires a correction if it affects the taxable base. The discount conditions should result from an agreement, bonus programme rules or another arrangement with the contractor. For collective discounts, it is particularly important to determine which period and which transactions the correction relates to. In companies with high sales volumes, a control mechanism should be implemented before such corrections are sent to KSeF.

Error in price or quantity of goods

If the original invoice included an understated price or an incorrect quantity of goods, the correction may increase the taxable base. In this case, it is necessary to determine whether the error already existed when the original invoice was issued.

• If yes, the correction may require retrospective settlement.
• If no, and the increase in remuneration results from later arrangements between the parties, the correction may be settled on a current basis.

Error in buyer details

After the abolition of correction notes, errors in buyer details will require action on the seller’s side. This applies, among other things, to an incorrect name, address or taxpayer identification number (NIP). For entrepreneurs, this means the need for more precise verification of contractor data before issuing the original invoice. The better the control of input data, the fewer formal corrections will be required on the seller’s side.

Incorrect Podmiot3 data in KSeF

In practice, errors may also occur in relation to the Podmiot3 element in the invoice structure, i.e. an additional entity indicated on the invoice other than the seller and the buyer. Initially, the tax authorities presented an approach under which, in such a case, it might have been necessary to correct the invoice to zero and issue a new one. However, this position has since changed. In the individual tax ruling of 13 April 2026, ref. no. 0113-KDIPT1-3.4012.1091.2025.3.JM, the Director of the National Revenue Information (KIS) confirmed that where incorrect or incomplete data relates to the invoice recipient indicated as Podmiot3, it is sufficient to issue a corrective invoice. This means that not every error in this element automatically requires the invoice to be reduced to zero and a new document to be issued.

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How to prepare your company for corrective invoices in the National e-Invoicing System (KSeF) in Poland?

Preparation for handling corrections in KSeF should cover both systems and procedures. Step 1 – Analyse the current process Identify who initiates the correction, who approves it, who issues the document and who is responsible for recognising it in tax settlements. Step 2 – Verify the system Check whether the accounting or sales system supports the required correction scenarios, including:

• collective corrections,
• corrections to advance payment invoices,
• discount corrections,
• corrections of buyer details,
• handling rejected documents.

Step 3 – Define the approval procedure Determine which corrections may be generated automatically and which require approval by accounting or the person responsible for tax matters. This is particularly important for high-value corrections, in plus corrections and corrections relating to unusual transactions.

getsix® supports entrepreneurs in preparing for new obligations, including accounting services in Poland, VAT settlements, tax procedures and processes related to KSeF.

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National e-Invoicing System (KSeF) in Poland and tax security

KSeF increases the transparency of invoice circulation. For entrepreneurs, this may mean greater control over documents, but also greater importance of data quality and procedural consistency. Tax risks may arise from:

• incorrectly issued corrective invoices,
• lack of documentation justifying the correction,
• delays in submission to KSeF.

From the management perspective, KSeF should be treated not only as a technology project, but also as an element of tax compliance in Poland. Corrective invoices are one of the areas where a lack of procedures may lead to VAT errors, disputes with contractors and problems during month-end closing.

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Will KSeF simplify corrective invoices?

KSeF may simplify the technical circulation of corrective invoices because it organises the way they are issued, made available and identified. The entrepreneur will no longer have to rely solely on e-mails, confirmations of receipt or dispersed PDF files. However, this does not mean that corrective invoices will become fully automatic. It will still be necessary to:

• determine the reason for the correction,
• assess the tax consequences,
• indicate the correct settlement period,
• retain business documentation.

KSeF will help most those companies that have organised data, clear procedures and well-integrated systems. At the same time, it may reveal problems in companies where invoicing, sales, warehouse and accounting operate independently of one another.

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FAQ – corrective invoices in the National e-Invoicing System (KSeF) in Poland

Do corrective invoices have to be issued in KSeF?

Yes. If the taxpayer is subject to the obligation to use KSeF, corrective invoices relating to transactions covered by the system should be issued as structured invoices.

Does KSeF change the reasons for issuing a corrective invoice?

No. KSeF does not change the basic reasons for issuing a correction. The actual course of the transaction remains decisive, for example a return of goods, discount, complaint, pricing error or error in buyer details.

Will correction notes still be available after KSeF is implemented?

No. Under the mandatory KSeF model, the provisions on correction notes are repealed. Errors that could previously be corrected by the buyer using a correction note will require a corrective invoice issued by the seller.

When is a corrective invoice in KSeF deemed to be received?

A structured invoice is deemed to be received using KSeF on the date on which the system assigns its identifying number. This is why it is important to monitor the document status, not only the date when the document was prepared.

Does an in minus corrective invoice require additional documentation?

Yes. KSeF confirms the circulation of the invoice, but it does not replace business documentation. For in minus corrections, it is still necessary to demonstrate the reason for reducing the taxable base.

How should in plus corrective invoices be settled in KSeF?

The reason for the correction is decisive. If it already existed when the original invoice was issued, the correction may require retrospective settlement. If it arose only after the sale, it is generally settled on a current basis.

Is preparing the correction in the accounting system enough?

No. The document must be effectively sent to KSeF and accepted by the system. If the invoice is rejected, it should not be treated as an effectively issued structured invoice.

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Corrective invoices in KSeF require entrepreneurs to adopt a new approach to document circulation, data control and VAT settlements in Poland. The change is not limited to replacing a paper or PDF invoice with a structured document. In practice, KSeF affects the entire correction process: from identifying the reason, through preparing the document, to its acceptance by the system and recognition in tax settlements. The most important point is that the company must be able to combine three elements:

1. correct data,
2. proper tax assessment,
3. control of the invoice status in KSeF.

Only this approach makes it possible to reduce the risk of errors and ensure efficient circulation of corrections.