〜ことになる
Formation
Meaning
Used when saying that a decision has been made regardless of your own will, or as a result of circumstances.
Note
Expresses that a certain course of action or outcome has been decided by an external force, such as a group, organization, or fixed schedule. It implies that the speaker is not the sole decision-maker. It is often used for official arrangements, rules, or unavoidable consequences. Contrast this with '〜ことにする', which expresses the speaker's own personal decision or choice.
Examples
来月から日本へ出張することになりました。
It has been decided that I will go to Japan on a business trip from next month.
来月から新しいルールが始まることになります。
It has been decided that a new rule will start from next month.
これ以上、その問題については話し合わないことになりました。
It has been decided that we will not discuss that issue any further.
急に予定が変更されることになりました。
It has been decided that the schedule will be changed suddenly.