What it means
上は expresses a firm conclusion or responsibility that follows from an established fact, decision, or situation. It can mean “now that” or “since,” often with the nuance that the speaker must act consistently with what has already been accepted or decided. It commonly follows a plain verb, especially the past form, and it can also follow a noun or a な-adjective with である. The main clause often describes an obligation, determination, or unavoidable consequence.
Usage note
上は is more formal and resolute than ordinary causal expressions such as から or ので. Do not confuse it with 上で, which means “after doing” or “in the process of doing.” The expression itself does not change for politeness; politeness is shown in the final predicate.
How to use it
責任者である上は、部下の意見を尊重します。
Since I am the person in charge, I will respect my subordinates' opinions.
有利である上は、この条件を受け入れるべきです。
Since it is advantageous, we should accept this condition.
この計画を実行する上は、十分な準備が必要です。
Since we are going to carry out this plan, thorough preparation is necessary.
引き受けた上は、最後まで責任を持ちます。
Now that I have accepted it, I will take responsibility until the end.
責任者である上は、部下の意見を尊重する。
Since I am the person in charge, I will respect my subordinates' opinions.
有利である上は、この条件を受け入れるべきだ。
Since it is advantageous, we should accept this condition.
この計画を実行する上は、十分な準備が必要だ。
Since we are going to carry out this plan, thorough preparation is necessary.
引き受けた上は、最後まで責任を持つ。
Now that I have accepted it, I will take responsibility until the end.
Example sentences
委員長に選ばれた上は、最後まで責任を持って計画を進めます。
Now that I have been chosen as chairperson, I will carry the plan forward responsibly until the end.
海外赴任を引き受けた上は、現地の文化を尊重して仕事に取