Is it allowed to sign a document on behalf of another person? Find out the answer

It is permitted to sign a document on behalf of another person only when there is formal authorization, such as valid power of attorney ou registered delegation. Outside of these cases, the practice may configure ideological falsehood ou fraud, subject to civil and criminal sanctions. To ensure validity, it is necessary to prove legal representation and maintain evidence of traceability.

In contexts where the firm is made through electronic signature, this representation must be clear both to the platform used and to others involved in the signature flow. In particular, there must be technical evidence that proves who signed, at what time and with what type of authorization.

Brazilian legislation, with the Law 14.063 / 2020, determines specific conditions for the signature made by third parties to be legally valid. Without this, the practice may constitute ideological falsehood or fraud.

When signing a document on behalf of someone else is legal

There are situations in which it is legally permitted to sign a document on behalf of another person. The most common is through a letter of attorney, which grants powers to a third party to act on behalf of the grantor. It may be a public or private power of attorney, and must always contain the expressed and delimited powers.

Examples include:

• representation of minors by parents or guardians;
• signatures delegated by managers or executives, including via digital systems;
• temporary and formal authorizations valid for specific purposes.

In corporate environments, it is common for legal departments to establish standardized power of attorney templates with specific clauses for contractual operations, including limits on value, term and scope. These documents, when signed electronically, can be integrated into the organization's contract management system.

In the electronic context, these authorizations may be linked to the functionalities of the digital signature platform, with mechanisms of identity verification and delegation of responsibilities. This ensures legal compliance and auditability at every stage of the process.

Furthermore, legal support depends on the clarity of documents and the transparency of the signed terms. The digitalization of these processes, from creation to collection of signatures, increases companies' ability to audit decisions, assign responsibilities and maintain compliance with national and international regulations, such as the LGPD.

When the practice is illegal and may generate sanctions

Signing a document on behalf of another person without formal authorization constitutes a civil and criminal offense. This practice may be classified as ideological falsehood (art. 299 of the Penal Code), and is aggravated when it involves business or public documents or financial transactions.

According to Momentum Law Group, companies that neglect to monitor signatories face risks of fraud, contract delays and lawsuits due to document nullity. This compromises not only the validity of signed documents, but also the customer experience and operational efficiency.

The risk also extends to the labor, tax and regulatory spheres, especially in sectors subject to continuous monitoring. If the signature is made by someone who does not hold formal powers, the company's CNPJ and the managers involved may be held liable, in addition to financial and reputational sanctions.

In the digital environment, signatures made by third parties without formal registration and traceability are also subject to dispute. Therefore, authenticity and integrity must be ensured with resources such as digital certificate, cryptographic hash e liveness.

It is also important to highlight that attempts to simulate consent or digitally reproduce the signature of third parties without authorization may constitute digital fraud, with serious criminal implications. In many cases, these acts leave traces in authentication systems that serve as evidence against the perpetrator of the improper action.

The role of power of attorney and formal delegation

A electronic power of attorney is the main legal instrument for third parties to sign documents on behalf of another person with legal validity. It defines:

• who is authorizing;
• who is the representative;
• how long;
• in which contexts or documents.

To ensure full legal validity, the power of attorney must be registered and contain objective clauses on the limits and powers granted. In technology companies and financial institutions, it is common to use power of attorney management solutions with automatic expirations and integrated access logs.

Another alternative, provided for in more advanced electronic systems, is the signature by a signature delegate, also known as a delegated signature. In this way, the platform records that a certain person is signing on behalf of another, making this clear to all parties involved.

This resource is increasingly used to maintain continuity of flows in justified absences, especially in business environments with workflow documented approval. Formal delegation also reduces rework and improves contract governance.

Adopting systems with a user hierarchy and visible audit trails strengthens a culture of accountability. It also helps to avoid conflicts between departments and ensures that no signatures occur outside of permitted parameters, guaranteeing operational and legal security for all involved.

The importance of traceability and attribution of authorship

In digital environments, one of the pillars of security is traceability. This involves:

• identification of the person who signed;
• when it was signed;
• on which device and location;
• with what kind of digital signature;
• which validation mechanisms were used.

A attribution of authorship is essential to mitigate disputes and increase the evidentiary force of the document. It allows companies to have full control over who is allowed to sign, including with integrations in ERPs, CRM systems ou platforms for digital signature.

Furthermore, traceability allows for faster internal and external audits. With log reports, audit trails, and multifactor authentication layers, it is possible to reconstruct the lifecycle of any digital document, strengthening compliance and reducing legal loopholes.

The absence of this traceability can negatively impact the legal value of a contract. In legal disputes, the lack of clear technical evidence of authorship tends to weaken the defense of the party seeking to validate the document, making traceability a strategic ally of legal security.

⚠️ Also check out these related articles 👇

➡️ Signature delegation: what does it mean and how does the process work?
➡️ What are the 10 types of digital signature errors and how to avoid them?
➡️ When hiring ZapSign, what advantages do the digital signature plans offer?

How to prevent risks with safe tools

To avoid operational and legal risks, the use of a platform trusted digital signature is fundamental. This choice must consider:

• security certification, such as ISO 27001;
• tracking features and digital audit;
• integration with functionalities of delegation and representation;
• support to different types of signature, including with facial biometrics.

A efficient document management is also essential, especially for organizations in the process of the digital and sustainable transformation, who want to integrate legality, efficiency and user experience.

Robust tools also reduce reliance on manual procedures, optimize legal teams’ time and increase the return on investment of contractual operations. In addition, they allow companies to manage the document lifecycle with greater transparency and consistency.

Another important point is the automation of notifications and alerts about pending documents, expiration of delegated powers and contractual updates. With these features, the legal team acts more strategically, reducing risks and strengthening digital governance.

How ZapSign helps in this context

Signing a document on behalf of another person can be legal and safe, as long as all legal, technical and contractual conditions are respected. The lack of authorization, traceability or control can result in nullity, civil and criminal liability, in addition to financial losses.

Therefore, it is recommended to use solutions that offer secure signature delegation, access control and integration with the contract life cycle. The ZapSign stands out as a platform that combines usability, security and affordable costs, being ideal for companies looking to increase ROI and reduce operational inefficiencies.

It also offers formal delegation features within the platform itself, with clear records of responsibility and complete audit trails. This ensures that each signature made by a third party is backed by valid and easily auditable authorization.

Furthermore, the platform stands out for its customizable plans and specialized support that accompanies the company at every stage of the digitalization process. This proximity ensures adherence to the client's business model and facilitates the implementation of the solution with a high success rate.

With the legal AI document generator, it is possible to create contracts that comply with current legislation, ready to be signed with the correct representation and authentication mechanisms. This means greater autonomy for the legal sector, greater security for the company and greater agility in decision-making. Click here to find out more now!