いかんで／いかんでは／いかんによって（は）
Depending on / according to / based on → the result changes depending on a certain condition
N1
Meaning
Depending on / according to / based on → the result changes depending on a certain condition
Formation
Noun + いかんで + Result
Noun + いかんでは + Result
Noun + いかんによって（は） + Result
Explanation
This usage expresses that the outcome is not fixed, and will change depending on a condition.
🔸 Very similar to 次第で, but いかん sounds more formal and rigid.
The noun before いかん usually refers to:
decisions
circumstances
methods
results
content
Key nuance:
Strongly formal and written
Often implies importance or seriousness
The result can be positive or negative
Common in:
official announcements
policies
contracts
JLPT N1 reading passages