No Need To
4 related grammar points that express the same core idea - compared below so you can tell which one to reach for.
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- ～ことはない JLPT N3
- Verbる にはあたらない JLPT N1
- Verbる までもない JLPT N1
- ～には及ばない JLPT N1
ことはない / までもない / にはあたらない
Formal writing: saying something is too obvious to need stating.
Verbる までもない vs ～ことはない: Use までもない. It says the action would be superfluous (言うまでもなく, 'needless to say'). ことはない is the everyday 'there's no need to' and is usually reassurance offered to a person, which is a different job in a different register.
Saying a step is redundant, rather than that a reaction is unwarranted.
Verbる までもない vs Verbる にはあたらない: までもない says the action would be superfluous. にはあたらない says the feeling is not called for (驚くにはあたらない, 'no cause for surprise'). One is about whether a step is necessary, the other about whether a reaction is justified.