Electronic signature, scan or email: how can a B2B contract be validly concluded in Poland?

Does every Polish B2B contract require a signature?

No. Polish private law generally permits the parties to choose how they contract unless legislation or their own arrangement imposes a particular form. An ordinary services agreement may therefore be concluded by signing one document, exchanging counterparts, accepting an offer by email or, in some circumstances, commencing performance on the agreed terms.

Freedom of form does not remove evidential and operational risk. A party may later need to establish who accepted which version, when the agreement was formed and whether the individual acting for the counterparty had authority. A sound digital process should preserve the document, party identification, date, version and evidence of acceptance.

The signing method should be reviewed together with the substantive ten-clause checklist for a Polish B2B contract. A technically valid signature will not correct an uncertain scope, defective authority or conflicting schedules.

What are documentary, written and electronic form under Polish law?

Documentary form requires a declaration of intent to be made in a document in a manner allowing the person making it to be identified. A document is a medium which enables the information to be read. Depending on the circumstances, this may include an email, a file, a system message or a retained platform acceptance.

Written form requires a handwritten signature on a document containing the declaration. The parties do not need to sign the same sheet: they may exchange matching signed documents or counterparts.

Electronic form as defined by the Polish Civil Code requires an electronic declaration bearing a qualified electronic signature. It is equivalent to written form. In business language, however, “electronic signature” also describes click-through acceptance, SMS codes and signatures drawn on a screen. Those methods can offer useful evidence and satisfy documentary form, but they are not thereby qualified electronic signatures.

Under eIDAS, an electronic signature must not be denied legal effect or admissibility as evidence merely because it is electronic or not qualified. This does not make every electronic signature equivalent to a handwritten signature. That equivalent effect is attached to a qualified electronic signature.

Is an email or scanned signature sufficient?

For an ordinary services contract with no special form requirement, often yes. Clear email acceptance or an exchange of legible scans may form the contract and evidence its terms. The sender’s authority and the completeness of the agreed terms still need to be checked.

A scan is a digital copy of a paper document. It does not contain the original handwritten signature and therefore does not automatically satisfy Polish written form. Where written form is required for validity, relying solely on scans can prevent the intended legal effect from arising.

This matters in particular for assignments of economic copyright and exclusive licences. Technology customers often expect ownership of commissioned code, although their execution process may not satisfy the required form. The issue is discussed further in B2B agreements with developers and software houses.

When is an ordinary platform signature insufficient?

Review the actual signature method, not just the product name. A provider may offer simple, advanced and qualified signatures within the same platform. Each method may use different identity checks and have a different effect under Polish law.

Where Polish written form is required, the usual electronic solution is a qualified electronic signature. Polish trusted signatures and personal signatures are useful for public-sector dealings and cases governed by specific legislation, but they should not automatically be treated as qualified signatures for every private B2B contract.

Some transactions require notarised signatures or a notarial deed. A transfer of shares in a Polish limited liability company generally requires signatures certified by a notary, while a property sale requires a notarial deed. A qualified electronic signature does not normally replace these formalities unless specific legislation provides a dedicated electronic route.

What form applies to amendments and termination notices?

The execution process should cover the entire contract lifecycle. Under the Polish Civil Code, an amendment generally needs to follow the form required by legislation or agreed by the parties for the contract. The document may expressly require changes to be made in a specified form for validity.

Termination by agreement, withdrawal and notice are governed by separate rules, which can be modified by the contract or specific legislation. A company should not assume that every later notice can be sent through any channel simply because the original agreement was accepted online.

Delivery is also important. A declaration addressed to another party takes effect when it reaches that party in a manner enabling it to be read. Contracts should identify formal notice addresses, authorised recipients, update procedures and deemed-delivery rules. See How to terminate a B2B contractor agreement safely in Poland for the practical consequences.

How should a contract with a foreign counterparty be signed?

An EU qualified electronic signature based on a qualified certificate issued in one Member State should be recognised in other Member States under eIDAS. The governing law and its form requirements must still be identified, and the parties should confirm that they can technically validate the signature.

An international contract should specify the permitted signature methods, counterparts, file format, exchange process and prevailing language version. Using a global signing platform does not by itself answer whether the form required by the governing law has been met. Those choices are explained further in International contracts with Polish businesses.