〜には及ばない
there's no need to; no match for
Noun / Verb dictionary form + には及ばない / には及びません
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には及ばない has two meanings.
- No need to: a polite way to decline someone's concern or effort. ご心配には及びません, "please don't worry". お礼には及びません, "there's no need to thank me". The polite form 及びません is usual here.
- No match for: "can't reach the level of". 私の料理は、まだ母の料理には及ばない, "my cooking is still nowhere near my mother's".
及ぶ means "to reach, extend to", so both meanings come from "doesn't reach". In the "no need" sense, it's close to までもない. In the "no match" sense, it's close to にはかなわない.
Compare にすぎない (N2), "nothing more than".
Examples
ご心配には及びません。
Please don't worry.
わざわざお越しいただくには及びません。
There's no need for you to come all this way.
お礼には及びません。当然のことをしたまでです。
There's no need to thank me. I only did what anyone would.
私の料理は、まだ母の料理には及ばない。
My cooking is still nowhere near my mother's.
英語力では、彼女には及ばない。
When it comes to English, I'm no match for her.