What Is a Legal Fiction? Treating Something False as True on Purpose

A legal fiction is an assumption treated as true for a particular purpose, adopted knowingly and not open to disproof within the proceedings where it operates. The classic function was to extend a remedy to a situation it was not designed for at a time when courts could not simply announce a new rule, since jurisdiction was tied to particular forms of action and the way to reach a new case was to allege facts bringing it within an existing form. Parties alleged fictitious events, the other side was not permitted to deny them, and the court decided the real dispute under cover of the pretence. That mechanism allowed substantial development of the common law over centuries without anyone claiming to change it, which was necessary in a system that presented itself as discovering law rather than making it.

Many are live and most people encounter several without noticing:

• •Corporate personality, treating a company as a person that can own property, contract, sue and be sued
• •The presumption that everyone knows the law, which is false and is necessary since the alternative rewards ignorance
• •Constructive notice, treating a person as knowing what a public register contains whether or not they looked
• •Deemed service, treating a document as received on a specified day regardless of when it actually arrived
• •The reasonable person, an invented standard against whom conduct is measured
• •Relation back, treating an act as having occurred at an earlier date for the purpose of calculating rights

Criticism of the device is old and has substance. Bentham attacked fictions as lies told by judges to extend their power, arguing that a system needing pretence to reach a correct result should change the rule openly, and that the practice obscures what courts are actually doing from the people subject to their decisions. The transparency objection is the strongest, since a fiction converts a substantive decision about who should win into a technical question about whether a pleading fits, which makes the reasoning harder to scrutinise and the law harder to learn. Defenders reply that fictions are a way of managing change conservatively, preserving stability while adapting, and that a device everyone in the system understands is not a deception. The practical resolution in most systems has been to legislate away the older procedural fictions while retaining the substantive ones.

Neighbouring devices are frequently lumped together with fictions and differ in an important way. A presumption directs a court to assume something until evidence to the contrary is produced, so it allocates the burden of proof rather than asserting a falsehood, and it can be displaced by evidence, which a fiction cannot. The presumption of innocence is the best-known example and is not a claim that defendants are innocent. Some presumptions are irrebuttable and those function as fictions in practice. A deeming provision in a statute states that something is to be treated as something else for defined purposes, which is a legislature adopting a fiction openly and is generally regarded as preferable to a judicial one because it is visible and can be debated. Distinguishing these matters when reading a rule, since whether evidence can displace an assumption changes what a party has to do.

Corporate personality deserves separate attention because it is the most consequential fiction in modern law. Treating an organisation as a person allows it to own assets, to enter contracts in its own name, to persist beyond the lives of its members and to be sued without suing everyone involved, which is what makes large-scale enterprise possible, and the limited liability that accompanies it in most forms is a deliberate policy choice about who bears risk. The consequences are substantial and contested, since the same construction that enables investment also separates decisions from responsibility for them, makes enforcement against a dissolved entity impossible, and has been extended in some jurisdictions to give companies rights originally conceived for people. Arguments about whether a fiction adopted for convenience should carry those further consequences are live and unresolved.

An assumption known to be false, adopted for a purpose and not open to disproof, used historically to extend remedies when courts could not announce new rules openly. Corporate personality, the presumption that everyone knows the law and the reasonable person are all live examples. The transparency objection is the strongest, since a fiction converts a substantive question into a technical one.