Certified Translation of Invoices in Poland – When Is It Required?

International trade means that businesses routinely receive invoices issued in foreign languages. Polish companies may purchase goods or services from suppliers abroad, while companies operating in Poland may also issue invoices for foreign customers. In both cases, a practical question quickly arises: does a foreign-language invoice need a certified translation in Poland?

Under Polish law, the regulated professional title is sworn translator. In English-language communication, the resulting service is commonly described as a certified translation or a sworn translation. In this article, “certified translation” means a translation prepared or certified by a sworn translator authorised under Polish law. If you need an overview of this type of service, see our certified translation services.

This guide explains when a certified translation of an invoice may be required, who can prepare it, what specialist knowledge is important, how the cost is calculated, how long the service usually takes and whether an invoice can be translated from a scan or PDF.

Certified Translation of Invoices – Is It Mandatory in Poland?

Polish law does not impose a general rule requiring every invoice issued in a foreign language to be automatically translated by a sworn translator.

This does not mean that the language of accounting documentation is irrelevant. From 1 January 2026, the rules governing the tax revenue and expense ledger require entries in the ledger to be made in Polish and in PLN, and accounting evidence used for the ledger to be prepared in Polish. A foreign-language invoice may therefore require a Polish-language version for accounting purposes. This requirement should not, however, be confused with a universal obligation to obtain a certified translation from a sworn translator.

Whether certification is necessary depends primarily on the purpose for which the invoice will be used and the requirements of the institution receiving it. In routine business accounting, an ordinary translation or internal explanation may be sufficient in some circumstances. In official proceedings, audits, vehicle registration, court cases or other situations in which the accuracy of the translation must be formally confirmed, a certified translation may be required.

For a broader explanation of accounting and financial documentation, see our guide to certified financial document translation.

When Can a Certified Translation of an Invoice Be Required?

A certified invoice translation is most often needed when the document is to be used outside routine internal accounting and must be presented to an authority, court, auditor or another institution that requires an officially certified Polish-language version.

Customs Clearance and International Trade

Invoices are an important part of customs and trade documentation because they identify the parties to the transaction, describe the goods, state their value and quantity, and provide information relevant to customs procedures.

If a customs authority, customs representative or another competent body cannot reliably assess a foreign-language invoice, a translation may be requested. Depending on the procedure and the authority involved, a certified translation may be necessary where the translated document is expected to have formal evidentiary value.

Providing the required translation in the correct form can help prevent avoidable delays in import or export clearance.

Accounting, Tax Audits and Financial Reviews

A company’s accounting department may request a translation of a foreign invoice to correctly identify the nature of an expense, tax treatment, payment terms or other information relevant to the accounting records.

A translation may also become necessary during a tax audit, statutory audit, financial review or due diligence process. In these situations, the tax authority, auditor or other reviewer may need a reliable Polish-language version of the document. Whether that version must be certified should be confirmed with the institution conducting the review.

Financial documents often contain specialist tax, accounting and commercial terminology, which is why accuracy matters even where a certified translation is not formally required.

Registration of a Vehicle Purchased Abroad

Vehicle registration is one of the most common situations in which clients need a certified translation of a purchase invoice.

When a foreign-language invoice is used as proof of ownership of a vehicle imported into Poland, the registration authority generally requires the foreign-language document to be submitted together with a Polish translation prepared by an authorised sworn translator or, where permitted, by a Polish consul.

There is an important exception for certain information contained in registration certificates issued by EU Member States. Information covered by harmonised EU codes does not generally require translation. This exception does not automatically extend to a foreign-language purchase invoice used as proof of ownership.

Court Proceedings and Commercial Disputes

Invoices may also be used as evidence in disputes concerning international transactions, unpaid receivables, the value of delivered goods, the performance of services or other contractual issues.

If a foreign-language invoice is submitted in Polish court proceedings, the court may require a Polish translation so that the evidence can be properly assessed. Depending on the procedural circumstances and the court’s instructions, a certified translation prepared by a sworn translator may be required.

For this reason, it is always advisable to confirm the required form of translation with the court, legal representative or institution receiving the document before placing an order.

Who Can Prepare a Certified Translation of an Invoice in Poland?

A certified invoice translation used under the Polish sworn-translator system is prepared or certified by a sworn translator authorised to practise in Poland.

The profession is regulated by the Act on the Profession of Sworn Translator of 25 November 2004. A person authorised to practise is entered on the official list maintained by the Polish Minister of Justice. The standard Polish qualification route includes passing the state examination for sworn translators and taking the statutory oath before obtaining the right to practise.

If you want to verify a translator’s credentials, see our guide on where to find and verify a sworn translator in Poland.

Why Financial and Legal Terminology Matters

An invoice may look simple, but it can contain specialist terminology relating to VAT, tax treatment, payment terms, customs, international trade, discounts, adjustments, banking details, contractual clauses and statutory information.

The translator should therefore be able to understand both the language of the document and the commercial, accounting and legal context in which individual terms are used. This is particularly important where the translation will be reviewed by an accountant, auditor, tax authority or court.

When choosing a professional for complex financial documentation, it is worth considering relevant subject-matter experience in addition to formal qualifications. Our guide on how to choose a sworn translator in Poland explains the main criteria in more detail.

Structure, Stamps and Annotations

A certified translation should faithfully account for the relevant content of the source document, including seals, stamps, handwritten annotations, signatures and other elements that may affect its interpretation.

Invoices frequently contain tables, columns, tax rates, item descriptions and numerical data. The translation should therefore be structured clearly enough for the recipient to identify which translated information corresponds to the source document.

The aim is not to reproduce the invoice as an identical graphic copy, but to present its content accurately, completely and unambiguously. The professional principles applying to sworn translators are discussed further in our Rules of Professional Ethics.

How Much Does a Certified Translation of an Invoice Cost?

The cost of a certified invoice translation depends on the language combination, volume of text, complexity of the document, specialist terminology, number of annotations or stamps and the requested turnaround time.

It is important to distinguish between statutory remuneration rules and prices charged to private clients. The Regulation of the Minister of Justice of 24 January 2005 on remuneration for the activities of sworn translators sets statutory rates for work performed at the request of courts, prosecutors, the Police and public administration authorities. Under those rules, one page is calculated as 25 lines of 45 characters, and where another layout is used, one page equals 1,125 characters. Each started page is counted as a full page.

For private and business clients, the price is not fixed by those statutory public-authority rates. MS Mostowy nevertheless uses a billing page of 1,125 characters including spaces for certified translations, as stated in our certified translation price list.

A Physical A4 Page Is Not the Same as a Billing Page

A one-page invoice does not necessarily equal one billing page of translation.

A typical foreign vehicle purchase invoice may fit on a single physical A4 page but produce approximately two or three billing pages after translation. The final volume depends on the amount of text, the number of purchased items, legal notes, stamps, annotations and other information contained in the document.

This is why an exact price can only be confirmed after the document has been reviewed. If you want to understand why the number of billing pages can be higher than the number of physical pages, see our explanation of why certified translations can cost more than expected.

How Long Does a Certified Invoice Translation Take?

At MS Mostowy, a certified translation of a standard invoice is usually completed within 1–2 business days from confirmation of the order.

The actual turnaround time depends on the language, document length, complexity, formatting and current workload. Some invoices are based on recurring templates. If the translator has previously worked with the same document format, the process may be faster than in the case of a completely new and complex invoice.

The final price and delivery time are confirmed individually after the document has been reviewed. This allows the client to know the expected cost and deadline before the translation begins.

How to Order a Certified Translation of an Invoice from MS Mostowy

To request a certified invoice translation, send a clear scan or high-quality PDF of the document to MS Mostowy for assessment. You can also provide the original document where the receiving institution specifically requires a translation prepared from the original.

Before placing the order, check one important point with the authority, court, bank, auditor or other institution that will receive the translation: does it require a translation prepared from the original document, or will a translation prepared from a scan or copy be accepted?

This matters because the sworn translator’s certification clause identifies the type of source document used. If the translation is prepared from a scan or copy, that fact must be reflected in the certification. If the receiving institution requires the translation to be based on the original, the translator must be given access to the original document.

Many invoices now exist only in electronic form, for example as digitally generated PDF files. If this is the case, inform the translator when requesting the quotation so that the source document can be described correctly.

To receive an individual quotation and confirm the required turnaround time, contact MS Mostowy and send the invoice for review.

FAQ – Certified Translation of Invoices in Poland