Shall, must, may, and will in contracts: why context matters

There is no automatic equivalent

Shall may impose a duty, describe a future legal effect, or appear as a drafting convention. Many modern drafting guides prefer must for requirements, but that editorial preference does not by itself resolve how an existing contract should be translated.

Common functions

• Must often states a duty or requirement.
• May often grants discretion or permission, subject to context.
• Will may express futurity, commitment, or consequence.
• Shall requires identifying the obligated actor and the full function of the provision.

Analysis method

Identify who is required, permitted, or committed to do what. Then compare definitions, related provisions, and the document's drafting convention. The Spanish solution should preserve that function without imposing a universal one-to-one equivalent.

Sources

• Digital.gov: Plain Language Guide
• Diccionario panhispánico del español jurídico

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