Invoicing in Poland 2026. Rules, Required Elements & KSeF Guide

For foreign companies doing business in Poland, understanding Polish invoicing rules is essential to ensure full tax compliance and avoid costly mistakes. From 2026, mandatory e-invoicing through the National e-Invoicing System (KSeF) will become a major obligation for many taxpayers operating in Poland. This means that businesses will need to issue invoices in a specific structured format and follow strict technical and legal requirements.

In addition, the Polish VAT Act imposes detailed invoicing rules, including mandatory invoice elements, deadlines for issuing invoices, correction procedures, and special requirements for cross-border transactions. Foreign businesses that are registered for VAT in Poland or supply goods or services there must make sure their invoicing practices are fully aligned with these regulations.

Incorrect invoicing can lead to serious consequences. These may include penalties, problems with VAT deduction, disputes with customers, delayed payments, and increased tax audit risk. In some cases, non-compliance may also result in the need to correct past settlements and pay interest.

That is why familiarity with Polish invoicing rules is not only an administrative issue, but a key element of safe and effective business operations in Poland.

Key message: “Poland’s invoicing landscape has changed dramatically with KSeF becoming mandatory in 2026.”

Overview of Polish Invoicing Rules

Under Polish VAT rules, VAT invoices must generally be issued by taxable persons who sell goods or services to another taxable person, a legal entity that is not a taxable person, or, in certain cases, to private individuals when specific regulations require invoicing. The main legal basis is the Polish VAT Act, especially Articles 106a–106q, which regulate when invoices must be issued, what data they must contain, how corrections are made, and the rules for duplicate and simplified invoices. A “factura” in the Polish legal sense is not just any commercial document: it is a document, in paper or electronic form, containing the data required by the VAT Act and confirming a taxable transaction.

From 2026, Poland’s invoicing framework is closely linked to KSeF, the National e-Invoicing System. According to the official rollout, the obligatory KSeF regime started on 1 February 2026 for the first group of taxpayers, with the next stage beginning on 1 April 2026. In practice, this means that structured e-invoicing has become a central element of Polish VAT compliance.

A structured invoice is different from a traditional invoice. A traditional invoice may be issued on paper or as a standard electronic file, such as a PDF, provided it contains the legally required elements. By contrast, a structured invoice is an e-invoice issued through KSeF in a defined logical format and assigned an identification number by the system. In other words, it is not merely an invoice sent electronically, but a tax document created and validated within the state platform.

Invoice Issuance Deadlines

Under Polish VAT rules, the general invoice issuance deadline is the 15th day of the month following the month in which the supply of goods or services was made. The same basic rule also applies to advance payments: if all or part of the payment is received before the supply, the invoice should generally be issued by the 15th day of the month following the month of receipt of the payment. These rules follow Article 106i of the Polish VAT Act.

Transaction type	Invoice deadline
Standard supply of goods / services	By the 15th day of the month following the month of supply
Advance payment (prepayment, deposit, instalment)	By the 15th day of the month following the month of receipt
Construction or construction-assembly services	Within 30 days from completion of the service
Printed books	Within 60 days from delivery
Supply of books by printing certain publications	Within 90 days from completion of activities

Polish law also provides that, as a rule, an invoice cannot be issued earlier than 60 days before the delivery of goods, performance of services, or receipt of advance payment, although some exceptions apply. This is important for businesses that want to align invoicing with contract milestones or internal accounting schedules.

In practice, meeting invoice deadlines is essential because late or incorrect invoicing may create VAT compliance risks, especially in cross-border business. From 1 February 2026 for the largest taxpayers and from 1 April 2026 for other taxpayers, Poland is introducing mandatory invoicing through KSeF in stages, which makes timely issuance even more important.

Types of Invoices in Poland

Below are the main types of invoices used in Poland:

1. Full VAT invoice
This is the standard invoice used to document taxable supplies of goods or services. It must contain all mandatory elements required by the Polish VAT Act, including the parties’ details, invoice number, transaction date, description, net amount, VAT rate, VAT amount and total amount due.

2. Simplified invoice (up to PLN 450 / EUR 100)
A simplified invoice may be issued where the total amount due does not exceed PLN 450 or EUR 100. It contains fewer details than a full invoice, but must still allow the transaction and VAT to be identified.

3. Advance invoice
An advance invoice is issued when the seller receives all or part of the payment before the supply of goods or services takes place. It documents the advance payment for VAT purposes.

4. Corrective invoice
A corrective invoice is used to amend an earlier invoice, for example where there was an error in price, quantity, VAT amount, VAT rate or other important invoice data.

5. VAT margin invoice
This invoice is used for transactions covered by the margin scheme, such as certain sales of second-hand goods, works of art, antiques, collectors’ items or travel services. In such cases, VAT is calculated on the margin, not on the full price.

6. VAT RR invoice
A VAT RR invoice is a special document used when a VAT taxpayer purchases agricultural products from a flat-rate farmer. It is subject to special legal rules.

Required Elements of a Polish VAT Invoice

A Polish VAT invoice is not merely a commercial record of a sale. It is a statutory tax document whose content is regulated primarily by the Polish VAT Act, in particular Articles 106a–106q, with Article 106e setting out the mandatory invoice elements. For businesses operating in Poland, the practical importance of these rules is obvious: an invoice that is incomplete, incorrectly drafted or missing transaction-specific wording may create deduction risks, trigger correction obligations and increase audit exposure. Since the rollout of mandatory KSeF e-invoicing in 2026, these requirements have become even more operationally significant, because invoice content must now align not only with substantive VAT rules but also with the structured invoicing environment.

As a starting point, every standard Polish VAT invoice should contain a core set of common data identifying the document, the parties, the underlying transaction and the tax calculation. These are the elements that determine whether the invoice properly documents a taxable supply for VAT purposes.

Required element	Practical significance
Date of issue	Mandatory on every invoice.
Sequential invoice number	Must uniquely identify the invoice within one or more series.
Supplier’s name and address	Identifies the taxable person issuing the invoice.
Supplier’s tax number (NIP/VAT number)	Core tax identifier of the seller.
Customer’s name and address	Mandatory buyer identification.
Customer’s tax number	Required where the buyer acts as a taxable person for the transaction.
Date of supply / completion / advance payment receipt	Required if different from the issue date and determinable.
Description of goods or services	Must identify the subject matter of the transaction with sufficient clarity.
Unit of measure and quantity	Relevant especially for goods and measurable services.
Unit net price	Price before VAT and before discounts.
Discounts or rebates	Must be shown if not already reflected in the unit price.
Net value of supply	Should be stated by VAT rate or exemption category.
VAT rate	Applicable rate for the transaction.
VAT amount	Usually shown separately for each VAT rate.
Gross amount payable	Total consideration due from the customer.
Exemption basis, where relevant	If the sale is exempt, the invoice should indicate the legal basis or wording explaining the exemption.

In addition to these standard fields, Polish law requires specific legends or additional information for certain types of transactions. This is particularly important in practice, because many invoice errors do not concern the arithmetic of VAT, but the failure to include the correct statutory designation for a special regime.

Special transaction type	Additional required wording / element	Key practical note
Reverse charge	“reverse charge”	Used where VAT is accounted for by the purchaser under the applicable rules; the invoice does not present output VAT in the standard way.
Mandatory split payment (MPP)	“mechanizm podzielonej płatności”	Required where the statutory split payment mechanism applies, including qualifying Annex 15 supplies above the PLN 15,000 threshold.
Margin scheme – travel agents	“procedura marży dla biur podróży” / equivalent statutory wording	VAT is settled under the margin scheme and is not disclosed in the ordinary manner.
Margin scheme – second-hand goods	“procedura marży – towary używane”	Specific legend required for this special taxation method.
Margin scheme – works of art	“procedura marży – dzieła sztuki”	Applies where the statutory margin regime is used.
Margin scheme – collectors’ items and antiques	“procedura marży – przedmioty kolekcjonerskie i antyki”	Required wording for this category of margin taxation.

For professional advisers and internationally active businesses, the key takeaway is that compliance with Polish invoicing rules is about much more than issuing a document labelled “invoice.” The document must contain all mandatory data required by the VAT Act and, where relevant, the correct wording for special transaction types. In the KSeF era, that distinction matters even more: a traditional PDF invoice and a structured invoice may look different operationally, but both must still reflect the statutory content requirements imposed by Polish VAT law.

Required Elements of a Polish VAT Invoice

For foreign businesses operating in Poland, invoice compliance is no longer just an accounting formality. A Polish VAT invoice is a statutory tax document, and its content is regulated in detail by the Polish VAT Act, in particular Articles 106a–106q, with Article 106e setting out the mandatory invoice elements. In practice, an invoice that is incomplete, incorrectly labelled or missing transaction-specific wording may create VAT deduction risk, trigger correction obligations and increase audit exposure. Since the KSeF rollout began on 1 February 2026 for the first group of taxpayers and expanded from 1 April 2026 for the next group, these legal requirements must now also be implemented in the structured FA(3) XML environment.

As a rule, a full VAT invoice must contain the standard identification and tax data required by Article 106e, including the issue date, invoice number, supplier and customer details, tax numbers, description of goods or services, quantities, prices, VAT rate, VAT amount and total amount due. By contrast, a simplified invoice may be issued where the total amount due does not exceed PLN 450 or EUR 100. In that case, Polish law allows a reduced data set. In KSeF, this simplified format is reflected through the invoice type designation “UPR”.

Full invoice vs simplified invoice

Legal element / business content	Full VAT invoice	Simplified invoice	KSeF field
Date of issue	Required	Required	Fa/P_1
Sequential invoice number	Required	Required	Fa/P_2
Seller name and VAT ID	Required	Required	Podmiot1/…/Nazwa, Podmiot1/…/NIP
Buyer name and address	Required	May be omitted	Podmiot2/…/Nazwa, Podmiot2/Adres
Buyer VAT ID / tax number	Required where applicable	Typically the key buyer identifier retained on a simplified invoice	Podmiot2/…/NIP
Description of goods / services	Required	Required	FaWiersz/P_7
Quantity and unit	Required where relevant	May be omitted	FaWiersz/P_8A, P_8B
Unit net price	Required	May be omitted	FaWiersz/P_9A
VAT rate	Required	Required in simplified form sufficient to determine tax	FaWiersz/P_12
VAT amount / tax breakdown	Required	Reduced content permitted	Fa/P_14_*
Total amount due	Required	Required	Fa/P_15
Simplified invoice marker	Not applicable	Required in KSeF logic	Fa/RodzajFaktury = UPR

This legal-technical mapping is practical rather than mechanical. KSeF does not simply reproduce Article 106e field by field. Some statutory elements map directly to classic P_* fields, while others are structured through broader XML nodes such as Podmiot1, Podmiot2, FaWiersz or Adnotacje.

Additional mandatory wording for special transactions

Certain transactions require more than the standard invoice content. In particular, the invoice must include the correct statutory legend for special VAT regimes, and in FA(3) these annotations are generally reflected in the Adnotacje section.

Transaction type	Required wording / effect	KSeF field
Reverse charge	“reverse charge”	Fa/Adnotacje/P_18
Mandatory split payment	“mechanizm podzielonej płatności”	Fa/Adnotacje/P_18A
Margin scheme	Margin-regime wording depending on transaction type	Fa/Adnotacje/PMarzy
VAT exemption	Legal basis or wording indicating exemption	Fa/Adnotacje/Zwolnienie

For businesses active in Poland, the key point is clear: invoice compliance now requires both correct VAT-law content and correct KSeF/XML mapping. A document may be technically generated in KSeF and still be legally defective if mandatory data or required annotations are missing. That is why Polish invoicing should now be treated as both a tax and a systems compliance issue.

Simplified Invoices

A simplified invoice may be issued in Poland where the total amount due does not exceed PLN 450 or EUR 100. This follows Article 106e(5)(3) of the Polish VAT Act. In that case, the invoice may contain a reduced data set instead of the full invoice details otherwise required under Article 106e(1).

In practice, a simplified invoice may omit, in particular, some of the buyer-related data that would normally appear on a full VAT invoice. The official KSeF materials expressly note that, in the case of an invoice under Article 106e(5)(3), the invoice may omit, among other things, the buyer’s name and address. More broadly, a simplified invoice does not need to reproduce the full set of standard invoice fields, provided that it still allows the transaction and the tax to be identified correctly.

However, the simplified invoice regime does not apply in all cases. It cannot be used, for example, for intra-Community supplies of goods (WDT). It is also excluded for certain cross-border B2C transactions, including distance sales and similar transactions for which the Polish VAT Act requires full invoicing rules rather than the reduced-content format. These exclusions are important for foreign businesses trading across borders, because the low-value threshold alone is not enough to justify simplified invoicing.

From a practical VAT compliance perspective, businesses should be cautious. Although simplified invoices are legally permitted in low-value cases, the absence of full customer data often makes VAT accounting, internal controls, and audit trails more difficult. In cross-border or higher-risk transactions, incomplete buyer information may also complicate input VAT recovery, reconciliation, and evidence gathering. For that reason, as a matter of best practice, we generally recommend issuing full VAT invoices whenever possible, even where a simplified invoice would technically be allowed.

Correcting Invoices in Poland: What Businesses Need to Know

In Poland, a corrective invoice is issued whenever an invoice already issued needs to be amended for VAT purposes. This applies in particular where the taxable amount or VAT amount changes, goods or packaging are returned, an advance payment is refunded, or an error is discovered in any item of the original invoice. In practice, a corrective invoice is the main legal instrument used to correct both financial and substantive invoice errors.

What must a corrective invoice contain?

Under Article 106j of the Polish VAT Act, a corrective invoice should include at least: its own issue date and number, the identifying data of the original invoice, the seller’s and buyer’s details, the goods or services concerned, and the scope of the correction. If the correction affects the taxable base or VAT amount, the invoice should show the amount of the adjustment by VAT rate or exempt sale. If the correction does not affect the tax base, it should indicate the corrected content instead. In the structured invoicing environment, the corrective invoice should also refer to the KSeF number of the original invoice where such number has already been assigned.

Corrective invoice vs. correction note

Traditionally, Polish law distinguished between a corrective invoice, issued by the seller, and a correction note, usually issued by the buyer to fix minor formal errors such as spelling mistakes or incorrect descriptive details. That distinction is now disappearing. Article 106k of the VAT Act has been repealed, which means that correction notes are no longer provided for in the current statutory framework. As a practical result, businesses should assume that invoice corrections must now be handled through corrective invoices issued by the supplier.

How are corrections settled after SLIM VAT?

The SLIM VAT reforms removed the old formal requirement to obtain confirmation that the buyer had received a downward correction before the seller could reduce output VAT. That was one of the most important simplifications introduced by the reform. Today, the settlement of corrections depends more directly on the statutory rules for the relevant correction model, and in the case of structured invoices KSeF significantly reduces the practical importance of proving receipt in the old way.

How are invoices corrected in KSeF?

In KSeF, a structured invoice is generally corrected by issuing a structured corrective invoice. Once an invoice has been sent to KSeF, it becomes part of the official system record and cannot simply be replaced or overwritten. The correction must therefore be made through a new correction document linked to the original invoice. This is especially important for businesses preparing internal invoicing workflows in Poland.

A practical note on “rebilling”

The term “rebilling” is widely used in business practice, but it does not exist as a statutory concept under Polish VAT law. Its commercial function is, however, fully covered by Article 8(2a) of the VAT Act, under which a taxpayer acting in its own name but on behalf of a third party is deemed to have received and supplied the service itself. In substance, this is the Polish VAT-law basis for the onward resale of services.

For businesses operating in Poland, the practical message is clear: invoice corrections should now be analysed not only from a VAT perspective, but also from a KSeF process and compliance perspective.

KSeF — Mandatory E-Invoicing from 2026

1. What is KSeF?

KSeF, the National e-Invoicing System (Krajowy System e-Faktur), is Poland’s central government platform for issuing, sending, receiving and storing structured invoices. A structured invoice is an invoice issued through KSeF and assigned a unique KSeF identification number. From a legal perspective, it is not just a PDF sent electronically, but an invoice created in the statutory system and in the official logical structure.

2. Implementation timeline

The current official rollout is phased. From 1 February 2026, KSeF became mandatory for the first group, i.e. large businesses. From 1 April 2026, it became mandatory for the remaining entrepreneurs, except the smallest businesses whose monthly sales documented by invoices do not exceed PLN 10,000 gross. That last group moves into KSeF from 1 January 2027. The Ministry of Finance has also issued separate 2026 guidance on determining whether a foreign entity has a fixed establishment / SMPD in Poland for KSeF purposes; in practice, this issue matters when assessing whether a foreign business falls within the Polish mandatory KSeF regime. I have not found an official public page that states in exactly those words that all foreign entities with a Polish fixed establishment enter only on 1 January 2027, so that point should be phrased with caution unless tied to a specific fact pattern.

3. XML format

KSeF invoices are issued in a structured XML format. Since 1 February 2026, the applicable logical schema is FA(3). This means that invoice data must be mapped into the official XML structure rather than produced only as a human-readable PDF.

4. Authorization methods

KSeF allows access and authorization through several methods. Official materials confirm login through login.gov.pl, a qualified electronic signature, a qualified electronic seal, and also the use of tokens. Tokens are generated after prior authentication and can then be used for commercial software integrated with KSeF.

5. What happens to a paper duplicate?

In the KSeF model, the practical importance of a traditional paper duplicate largely disappears. The invoice exists in the state system, can be viewed and downloaded there, and has its own KSeF number. A seller may still provide the buyer with a printout or PDF after the invoice has been sent to KSeF, but that is only an additional copy for business convenience, not a separate “paper duplicate” replacing the system record.

6. Offline24 mode

offline24 is a special mode used when the issuer cannot send the invoice to KSeF in real time, for example because of internet connectivity problems, transmission-quality issues, or simply by choice where the law allows this mode. Business-wise, the invoice is issued outside KSeF first and then sent to the system later within the statutory deadline. Official KSeF materials distinguish offline24 from other special offline situations, such as planned KSeF unavailability and officially announced system failure.

7. Consequences of non-compliance

As a rule, KSeF non-compliance may trigger financial penalties under the VAT Act, for example if a taxpayer required to issue a structured invoice issues it outside KSeF instead. At the same time, the Ministry of Finance has expressly announced a soft-landing period for 2026: no sanctions will be imposed in 2026 for errors made while using KSeF. So the risk exists in the legal framework, but 2026 currently operates as a transitional year with penalty relief for KSeF mistakes.

If you want, I can turn this into a polished website section for polishtax.com with headings and a timeline box.

Invoicing in Foreign Currencies

A short overview of invoicing in foreign currencies in Poland is as follows.

A Polish VAT invoice may be issued in a foreign currency, so the price, net amount and total consideration may be shown, for example, in EUR or USD. However, where VAT is charged, the VAT amount must in principle be expressed in PLN. This is a key Polish invoicing rule and remains highly relevant in practice, including in the KSeF environment.

For VAT purposes, foreign-currency amounts must be converted into PLN using the exchange rate provided for by the Polish VAT Act. As a rule, the taxpayer uses the average exchange rate of the National Bank of Poland (NBP) for the last business day preceding the tax point. Alternatively, the taxpayer may use the last exchange rate published by the European Central Bank (ECB) for the last day preceding that moment, with conversion via EUR where required. This choice should be applied consistently in accordance with the statutory rules.

The same logic applies to advance invoices. If an advance payment is received before the supply takes place, the relevant exchange rate is determined by reference to the day preceding the receipt of the advance, because the receipt of the advance generally creates the VAT point to that extent. As a result, where several advances are received on different dates, each advance may require a separate exchange-rate calculation for VAT purposes.

In practical terms, this means that businesses may invoice customers in foreign currency, but for Polish VAT reporting they must ensure that the VAT element is properly translated into PLN using the correct NBP or ECB rate. This is particularly important for advance payments, because an incorrect rate may affect both the invoice and the VAT return.

Here you will find detailed information about Invoices in foreign currency in Poland

Split Payment Mechanism (MPP) on Invoices

In Poland, the Split Payment Mechanism (MPP) is mandatory where three conditions are met jointly: the gross amount of the invoice exceeds PLN 15,000, at least one item on the invoice covers goods or services listed in Appendix 15 to the Polish VAT Act, and both the seller and the buyer are VAT taxpayers. MPP applies only to payments made by bank transfer in PLN between businesses.

If these conditions are met, the seller must place the wording “mechanizm podzielonej płatności” (“split payment mechanism”) on the invoice. If the annotation is missing, the seller should correct the invoice. Importantly, even if the invoice does not contain that wording, the buyer must still pay in MPP whenever the statutory conditions are satisfied.

The White List of VAT taxpayers is relevant because it allows businesses to verify whether the supplier is an active VAT taxpayer and whether the bank account used for payment is a registered business settlement account disclosed to the tax authorities. This matters in practice because mandatory MPP payments are made to a business account, while the VAT portion is automatically routed to the supplier’s VAT account linked to that business account.

Failure to comply may lead to serious consequences. If the seller omits the mandatory MPP annotation, the tax authority may impose an additional tax liability equal to 30% of the VAT relating to the goods or services covered by mandatory MPP. If the buyer fails to pay in MPP despite the obligation, the buyer may also face a 30% VAT-based penalty. In addition, a sole trader may face a fiscal penal fine, and payment made outside MPP may also create income tax cost consequences.

Common Invoicing Mistakes & How to Avoid Them

Even experienced businesses make recurring invoicing mistakes in Poland. In practice, these errors usually do not result from misunderstanding the commercial deal, but from missing formal VAT requirements, incorrect currency conversion, or inadequate verification of counterparty data. The safest approach is to combine legal review, ERP validation rules and a short pre-issuance checklist.

Common mistake	How to avoid it
Missing buyer’s VAT ID (NIP)	Verify whether the invoice is issued to a taxable person and make sure the buyer’s NIP is entered correctly. In KSeF, the NIP entered in the buyer identification field is crucial for making the invoice available to the recipient in the system.
Using the wrong exchange rate	Apply the correct NBP or ECB exchange rate from the day preceding the VAT point. Set accounting rules separately for standard invoices and advance invoices, because the relevant date may differ.
Missing mandatory MPP annotation	Check whether the invoice covers Appendix 15 goods or services and whether the gross amount exceeds PLN 15,000. If both conditions are met, add the wording “mechanizm podzielonej płatności” to the invoice.
Confusing the supply date with the invoice issue date	Always distinguish between the date of sale / supply and the date of issue. Configure templates so both fields are shown separately whenever the dates are different.
Showing VAT only in a foreign currency	Even if the invoice is issued in EUR or another foreign currency, ensure that the VAT amount is expressed in PLN for Polish VAT purposes.
Omitting the reverse charge wording	Build transaction-type controls into the invoicing process. Where the purchaser accounts for VAT under the applicable rules, the invoice should contain the required reverse charge wording.
Issuing the invoice after the statutory deadline	Use automated reminders and month-end controls. As a rule, invoices should be issued no later than the 15th day of the month following the month of supply unless a special deadline applies.
Using outdated White List data	Verify the supplier’s VAT status and bank account on the White List immediately before payment, especially for higher-value B2B transactions. Update master data regularly and document each verification.

For most businesses, the best protection against these mistakes is to treat invoicing as a tax compliance process, not just an accounting output. A short validation workflow covering NIP, MPP, currency conversion, invoice timing and White List verification will usually prevent the majority of practical errors.

Structuring Invoices in Poland: Common Pitfalls for Foreign Vendors

FAQ — Frequently Asked Questions

What are the required elements of a Polish VAT invoice?

A Polish VAT invoice must contain the elements listed in Article 106e(1) of the VAT Act, including the issue date, sequential invoice number, seller and buyer details, tax numbers, description of goods or services, quantity, unit price, VAT rate, VAT amount and total amount due. Additional wording may be required for special transactions, such as reverse charge, split payment or margin-scheme sales. For simplified invoices and certain special cases, some elements may be omitted under Article 106e(5).

When is the deadline to issue an invoice in Poland?

As a rule, an invoice must be issued no later than the 15th day of the month following the month in which the supply of goods or services was made, under Article 106i(1). The same general deadline applies to advance invoices, counted from the month in which the payment was received, under Article 106i(2). Some special transactions are subject to different deadlines under Article 106i(3)–(8).

What is KSeF and when does it become mandatory?

KSeF is Poland’s National e-Invoicing System, i.e. the state platform for issuing and receiving structured invoices. Under the current rollout, it became mandatory from 1 February 2026 for the first group of taxpayers and from 1 April 2026 for most remaining taxpayers. The official KSeF portal also indicates a later phase from 1 January 2027 for the smallest taxpayers covered by the transitional rules.

Can I issue an invoice in a foreign currency in Poland?

Yes, an invoice may be issued in a foreign currency, but the VAT amount should generally be shown in PLN. The conversion is made using the rules in Article 31a of the VAT Act, usually based on the NBP exchange rate from the last business day preceding the tax point, or alternatively the ECB rate if that method is chosen consistently. This rule also applies to advance payments.

What is a simplified invoice in Poland?

A simplified invoice is an invoice whose total amount due does not exceed PLN 450 or EUR 100, as provided in Article 106e(5)(3) of the VAT Act. In that case, some standard invoice elements, especially part of the buyer data, may be omitted, provided the transaction and VAT can still be identified. However, simplified invoices are not available in all cases, especially for certain cross-border transactions.

How do I correct an invoice in Poland?

Invoices are corrected by issuing a corrective invoice under Article 106j of the VAT Act. This is used where the tax base or VAT amount changes, goods are returned, an advance is refunded, or an error is found in any item of the invoice. If the original invoice was issued in KSeF, the correction should also be made as a structured corrective invoice.

What is the split payment mechanism (MPP) on invoices?

MPP is a mandatory payment mechanism for invoices covering goods or services listed in Appendix 15 to the VAT Act where the gross amount exceeds PLN 15,000, under Article 108a(1a). In such a case, the invoice must include the wording “mechanizm podzielonej płatności”. The payment is then split so that the net amount goes to the ordinary account and the VAT amount goes to the supplier’s VAT account.

Do foreign companies need to issue e-invoices via KSeF?

It depends on whether the foreign company falls within the Polish mandatory KSeF regime, which in practice may depend on its VAT status and whether it has a fixed establishment in Poland involved in the transaction. Official KSeF materials confirm the phased mandatory rollout in 2026, but the fixed-establishment analysis remains case-specific in practice. For foreign businesses, this should therefore be assessed individually before invoicing.

What are the penalties for incorrect invoicing in Poland?

Incorrect invoicing may trigger consequences under both the VAT Act and the Fiscal Penal Code, depending on the type of breach. In the KSeF context, the VAT Act provides for administrative sanctions for failing to issue invoices through KSeF where required, although 2026 is currently treated as a transitional period with softer enforcement for certain KSeF errors. Separately, materially defective invoices may also create VAT deduction risks and correction obligations.

What is the difference between a credit note and a corrective note?

In Polish VAT law, a credit note is not a separate statutory category; in practice, that English term usually refers to an in-minus corrective invoice under Article 106j. A correction note was traditionally a buyer-issued document for minor formal errors under Article 106k, but that provision has now been repealed. As a result, from the current 2026 framework onward, businesses should generally assume that invoice corrections are made through corrective invoices rather than correction notes. Początek formularza

How Intertax Can Help

ntertax supports foreign businesses with the practical and legal aspects of invoicing in Poland. Our team assists with VAT compliance, including invoice reviews, Polish VAT registration, reporting and ongoing transaction support, and also helps clients prepare for KSeF onboarding, from process mapping to implementation of structured e-invoicing requirements. Intertax also provides fiscal representation services in Poland for businesses that need a reliable local tax partner. These services are part of Intertax’s broader offer for international companies operating on the Polish market.

If your business needs support with Polish invoicing rules, KSeF implementation or VAT compliance, contact our team for tailored advice. You can learn more about our e-invoicing services here: E-invoicing in Poland.

To discuss your case directly, please use our contact page or reach us at office@intertax.pl and +48 14 626 29 88.