JLPT N1Written, formal

に至いたって・に至いたってはonly when it came to; and as for …

Two written forms. に至いたって is "only when things got that far", and usually too late. に至いたっては picks the most extreme case out of several just given: "and as for …".

only when it got that far

死し者しゃが出でるに至いたって、会かい社しゃはようやく欠けっ陥かんを認みとめた。

Only when someone died did the company finally admit the defect.

and as for …, the worst of all

三さん人にんとも遅ち刻こくした。田た中なかさんに至いたっては、二に時じ間かんも遅おくれて来きた。

All three were late. As for Tanaka, he turned up a whole two hours late.

Only when it got that far

Noun／verb (dictionary form) + に至いたって

重じゅう大だい事じ故こに至いたって, 死し者しゃが出でるに至いたって. Stiffer, in reports: に至いたり. With も it is "even then": に至いたっても.

As for …, the worst of all

Noun + に至いたっては

The noun is one of several cases, and the others come first.

Where you'll meet it: News, reports, commentary. に至いたっては is also heard in speeches, and from someone working through a list of complaints.
Out loud: People say 死し者しゃが出でて、やっと… for the first and 弟おとうとなんか… for the second.

に至いたって: only when it got that far

Things went on, usually getting worse, and it took reaching this point for anyone to act, admit it or notice. ようやく, やっと or 初はじめて tends to follow, and the point is usually that it came too late.

長なが年ねん、症しょう状じょうを軽かるく見みていたが、歩あるくことも困こん難なんになるに至いたって、彼かれはようやく受じゅ診しんした。

He had made light of his symptoms for years, and only when even walking became difficult did he finally see a doctor.

小ちいさな不ふ具ぐ合あいが各かく地ちで報ほう告こくされ、重じゅう大だい事じ故こに至いたって、メーカーは初はじめて設せっ計けい上じょうの問もん題だいを認みとめた。

Small faults had been reported all over the country, but only when it came to a serious accident did the maker admit, for the first time, that the design was at fault.

事ことここに至いたっては、計けい画かくを中ちゅう止しするしかない。

Now that things have come to this, all we can do is call the plan off.

事ことここに至いたって, "now that it has come to this", is a set phrase. It often takes は, and that is not the "as for" one: no list comes before it.

に至いたっても: even then

With も, things got that far and still nothing changed. なお or まだ often follows.

被ひ害がいの報ほう告こくが各かく地ちから相あい次つぎ、死し者しゃが出でるに至いたっても、責せき任にん者しゃはなお対たい応おうを変かえなかった。

Reports of harm kept coming in from all over the country, and even when people died, the person in charge still did not change course.

に至いたっては: and as for …

Several cases come first. Then に至いたっては sets the most extreme one apart, with something worse to say about it. With no other cases before it there is nothing for it to top, so it isn't a plain "as for".

兄あには英えい語ごが苦にが手てで、弟おとうとに至いたっては全まったく話はなせない。

My older brother is bad at English, and as for my younger brother, he can't speak it at all.

会かい議ぎ室しつには書しょ類るいが積つまれ、廊ろう下かには箱はこが放ほう置ちされ、非ひ常じょう口ぐちに至いたっては荷に物もつで完かん全ぜんにふさがれていた。

Papers were piled up in the meeting room, boxes had been left in the corridor, and as for the emergency exit, it was completely blocked with packages.

一いち日にち目めは百ひゃく人にん、二日目ふつかめは三さん百びゃく人にんが訪おとずれ、最さい終しゅう日びに至いたっては来らい場じょう者しゃが千せん人にんを超こえた。

A hundred people came on the first day, three hundred on the second, and on the last day the number of visitors passed a thousand.

Now and then the extreme is a good one.

Close neighbours

に至いたるまでN1

A range, not a point reached and not one case set apart: "right down to", with everything in between counted in.

社しゃ長ちょうから新しん入にゅう社しゃ員いんに至いたるまで、全ぜん員いんが研けん修しゅうに参さん加かした。

Everyone took part in the training, from the president right down to the newest recruits.

Check yourself

1Which one fits?

父ちちは料りょう理りが下手へたで、母ははもあまり得とく意いではない。兄あに（　　）、卵たまごも割われない。

Choose an answer to see why.

2Which one fits?

社しゃ員いんが次つぎ々つぎに倒たおれる（　　）、会かい社しゃはまだ残ざん業ぎょうを減へらそうとしなかった。

Choose an answer to see why.

More detail

至いたる is also a plain verb, "to reach" or "to lead to": 合ごう意いに至いたった, "they reached agreement". In a report, に至いたり often just joins that to the next step, with no "only then" in it.

半はん年としにわたって協きょう議ぎを重かさね、最さい終しゅう合ごう意いに至いたり、両りょう社しゃは共きょう同どう声せい明めいを発はっ表ぴょうした。

After six months of talks the two companies reached a final agreement and issued a joint statement.

More sentences

数すうか月げつにわたって異い常じょうが報ほう告こくされていたが、事じ故こが起おきるに至いたって、会かい社しゃはようやく設せつ備びの欠けっ陥かんを認みとめた。

Faults had been reported for months, but only when an accident happened did the company finally admit that the equipment was defective.

再さい三さんの警けい告こくを受うけ、営えい業ぎょう停てい止しに至いたっても、店みせ側がわはなお安あん全ぜん管かん理りを改あらためなかった。

Even after repeated warnings ended in an order to stop trading, the shop still did not mend its safety management.

新しん人じんは説せつ明めい書しょを読よみ、主しゅ任にんは一いち部ぶを確かく認にんしたが、部ぶ長ちょうに至いたっては資し料りょうを開ひらきさえしなかった。

The new recruit read the instructions and the supervisor checked part of them, but as for the department head, he didn't so much as open the materials.

最さい初しょは数すう分ふんの遅おくれだったが、その後ごは列れっ車しゃが運うん休きゅうし、夜よるの便びんに至いたっては復ふっ旧きゅうの見み通とおしさえ立たたなかった。

At first it was a delay of a few minutes, then trains were canceled, and as for the evening services, there was not even a prospect of their running again.