What is a mistake of law?
A mistake of law occurs when a person acts without being aware that their conduct is prohibited or subject to legal consequences. In criminal law, it usually concerns a mistaken belief that an act is lawful, even though it is in fact an offence. The concept may also arise in administrative, civil, tax and immigration matters, where a person misunderstands legal obligations, deadlines, procedures or the consequences of non-compliance.
A mistake of law should be distinguished from a mistake of fact. A mistake of fact concerns an incorrect understanding of circumstances, such as believing that a document is genuine when it has been forged. A mistake of law concerns the legal assessment of known circumstances, for example believing that using a particular document, entering a country or failing to report income is permitted.
As a general rule, lack of knowledge of the law does not automatically release a person from responsibility. Legal systems are based on the assumption that individuals should comply with binding rules. However, criminal law may take account of a justified mistake of law where a person could not reasonably have known that their conduct was unlawful.
How does a mistake of law operate in criminal cases?
Under Polish criminal law, a person who commits a prohibited act while being under a justified mistake as to its unlawfulness does not commit an offence. This rule is set out in Article 30 of the Polish Criminal Code. The assessment depends on the circumstances of the individual case, including the person’s situation, available information, professional role, previous experience and the steps taken to verify whether the conduct was lawful.
A mistake may be considered justified where the applicable rules were genuinely unclear, where a person relied in good faith on reliable official information, or where the legal situation was unusually complex. A court may also consider whether the person had a realistic opportunity to seek professional advice before acting.
If the mistake was avoidable, it will generally not exclude criminal liability. Nevertheless, Polish law allows the court to apply extraordinary mitigation of the penalty in cases involving an unjustified mistake as to unlawfulness. The outcome depends on the nature of the act, the degree of fault and the reasons why the person misunderstood the law.
The defence is not available merely because a person did not read the relevant regulations, ignored official correspondence or assumed that conduct was permitted without checking. This is particularly important for entrepreneurs, company officers, regulated professions and persons involved in cross-border activities.
When can legal advice be important?
Legal advice may be necessary before taking action that could create criminal, administrative or financial consequences. This applies especially where a matter involves several legal regimes, foreign regulations or changing requirements. A mistake of law may arise in matters concerning immigration status, border crossings, employment of foreign nationals, tax reporting, corporate duties, document use or compliance with regulatory obligations.
For private individuals, consultation may be useful when dealing with an investigation, a summons, an allegation of document forgery, a border-related incident or an obligation imposed by a public authority. For businesses, legal support may be needed when introducing internal procedures, responding to inspections, assessing reporting duties or managing risks connected with the actions of employees and management board members.
Early consultation with a lawyer can help identify applicable rules, document the steps taken to verify legality and reduce the risk of avoidable mistakes. It may also help prevent disputes, criminal exposure, administrative penalties and financial losses. Where proceedings have already begun, the circumstances of a possible mistake of law should be assessed carefully and supported by relevant evidence.
Legal support in cases involving a mistake of law
Legal assistance in matters involving a mistake of law may include in particular:
- assessing whether a mistake concerned facts or the unlawfulness of conduct;
- analysing whether the mistake may be regarded as justified or avoidable;
- reviewing legislation, official guidance, correspondence and internal procedures;
- preparing explanations and legal arguments for criminal or administrative proceedings;
- representing individuals and businesses before courts, prosecutors and public authorities;
- advising on compliance measures intended to prevent future legal risks.
Need legal assistance concerning a possible mistake of law? Contact us.