How to Say "mandatory" in Spanish
The Spanish word for “mandatory” is “obligado” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
AdjectiveA2
a rule or policy

Examples
El uso del casco es obligatorio para los ciclistas.
Wearing a helmet is mandatory for cyclists.
Una visita al museo del Prado es una parada obligada en Madrid.
A visit to the Prado museum is a required/must-do stop in Madrid.
Si llueve, el plan B es obligado.
If it rains, Plan B is necessary.
Agreement is Key
Since 'obligado' is an adjective, make sure its ending matches the thing it describes: 'la tarea obligada' (the required task, feminine) or 'los documentos obligados' (the required documents, plural).
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