てからでないと details
write + (and…) + not until you've done X — until that is out of the way, the rest is impossible
kaite kara de nai to
not until you've done X — until that is out of the way, the rest is impossible
meaning: until after writing
上司に確認してからでないと、お返事できません。
joushi ni kakuninshite kara de nai to, o henji dekimasen.
I can't give you an answer until after checking with my boss. neutral
あの店、予約してからじゃないと入れないよ。
ano mise, yoyaku shite kara ja nai to hairenai yo.
You can't get into that place unless you book first. casual
- formal
- contraction
Examples
not until X is done — X is the precondition, and the main clause reports what is impossible or not allowed until then
上司に確認してからでないと、お返事できません。
joushi ni kakuninshitekaradenaito, o henji dekimasen.
I can't give you an answer until after checking with my boss. neutral
あの店、予約してからじゃないと入れないよ。
ano mise, yoyaku shite kara ja nai to hairenai yo.
You can't get into that place unless you book first. casual
雨が上がってからでないと、作業は再開できない。
ame ga agatte kara de nai to, sagyou wa saikai dekinai.
Work can't start again until the rain has let up. neutral
ご入金を確認してからでなければ、商品を発送することができません。
go nyuukin o kakunin shite kara de nakereba, shouhin o hassou suru koto ga dekimasen.
We are unable to ship the goods until we have confirmed your payment. formal
Formation
{V-te}からでないとattaches to て-form
Variant notes
- てからでなければ — the stiffer written half of the pair, at home in notices, contracts and manuals（規約に同意してからでなければご利用いただけません）.
- てからじゃないと — the copula's spoken negative, and the everyday form of the pair（手を洗ってからじゃないとだめだよ）.
Notes
だめだ, 無理だ carry nearly all real examples. Nothing requires the
first event to be deliberate: 雨が上がってからでないと is ordinary.
Related patterns
Similar
てから only orders the two events and leaves the main clause free (シャワーを浴びてから寝る); てからでないと makes the first a precondition and forces the main clause negative — ×確認してからでないとお返事できます is out where できません is the only continuation.
Same "unless X, then nothing" skeleton with the negative in different places — ないことには negates the condition itself, てからでないと keeps it affirmative and adds ORDER on top, so only てからでないと claims X has to come first rather than merely happen.
Two sides of one precondition — て初めて states affirmatively what became possible or understood (使ってはじめて分かった), てからでないと states negatively what cannot be done yet, so the realization reading belongs to 初めて alone.
Lookalikes
行かないと can end a sentence by itself and still mean an obligation; てからでないと never can — でない is the copula negated under から, so the tail hangs off the preceding て-clause and something impossible must follow.