How to Say "by necessity" in Spanish
The Spanish word for “by necessity” is “necesariamente” — B1 level. This is a very common word in everyday Spanish.

Examples
Para ser feliz, no necesitas necesariamente mucho dinero.
To be happy, you don't necessarily need a lot of money.
Si llueve, no tiene que ser necesariamente un mal día.
If it rains, it doesn't necessarily have to be a bad day.
El plan está funcionando necesariamente, no hay otra opción.
The plan is necessarily working; there is no other option.
Adverbs Ending in -mente
This word is an adverb, meaning it describes how an action is done. It is formed by taking the feminine form of the adjective ('necesaria') and adding '-mente'. It is always the same form, no matter who is doing the action.
Placement in English vs. Spanish
Mistake: “Using 'necesariamente' awkwardly at the beginning of a sentence when it refers to the main verb (e.g., 'Necesariamente, tengo que ir').”
Correction: It sounds more natural to place it after the verb or after the main idea: 'Tengo que ir necesariamente' or 'No tengo que ir necesariamente'.
Related Translations
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