には及ばない|にはおよばない

1. 1There is no need to do (something), because the situation does not call for it.Ex. 1
2. 2Used politely to decline another person's thanks, worry, or effort as unnecessary.Ex. 2

A somewhat formal, literary way of saying something is unnecessary. It is typically used to reassure others or to decline thanks and concern, as in ご心配には及びません. Compared with the everyday ことはない or なくてもいい, it sounds more dignified and reserved.

• までもないN1「までもない」only means 'no need to', never 'not as good as', and attaches only to the dictionary form of verbs. It emphasizes that the action is unnecessary (obvious, predictable result, etc.) with a neutral tone. 「言うまでもない」should not be replaced with 「には及ばない」.
• にあたらないN1「にあたらない」attaches only to reactions or evaluations such as surprise, worry, criticism, or praise, indicating that such a reaction is unwarranted or excessive. It carries a stronger evaluative tone and is stiff in written style; it cannot attach to concrete actions and has no 'not as good as' meaning.
• ことはないN3「ことはない」corresponds only to the 'no need to' sense of 「には及ばない」, attaching only to the dictionary form of verbs, not to nouns. It is neutral in tone, gentle in feel, and often used to console someone. It has no 'not as good as' meaning.
• なくてもいいN4「なくてもいい」is similar only in the 'no need to' sense: it attaches to the ない-form, is neutral and common in everyday speech, and can also mean 'it's fine even without something'. 「には及ばない」attaches to the dictionary form or action nouns, is more formal, and additionally has the 'not as good as' meaning.
• に足りないN1「に足りない」is close only to the 'no need to' sense of 「には及ばない」, but it stresses that the target itself is of low value and not worth doing, with a harsher, more written-style tone. It cannot be used to politely respond to thanks and has no 'not as good as' meaning.
• に越したことはないN2「に越したことはない」means 'it's best to...' and advises someone to do so; when 「には及ばない」means 'no need to', it says there is no need to do it — nearly the opposite, so they cannot be swapped. The former can also attach to adjectives and the ない-form, with a neutral tone.

「には及ばない」has two meanings: 'no need to' and 'not as good as / can't compare to'. The other patterns lack the second meaning. When expressing 'no need to', 「までもない」emphasizes that the action is unnecessary or obvious; 「ことはない」and「なくてもいい」are neutral and more everyday, with 「ことはない」often used to console; 「にあたらない」only attaches to reactions or evaluations such as surprise, worry, or praise, indicating the reaction is excessive; 「に足りない」focuses on the target itself being of low value and not worth doing. 「に越したことはない」means 'it's best to...' — nearly the opposite of 'no need to'.