いたす

いたす is the humble form of する used by the speaker to show modesty about their own actions. It is common in traditional or highly polite speech, and is often used in business or service contexts when the speaker is in a position of serving or assisting the listener. Do not use いたす for actions done by others; for those, use the appropriate respectful language toward the other person and standard grammar. In modern everyday conversation, いたします and related forms appear in formal writing, customer service, and ceremonial speech. It is less common in casual speech and can sound old-fashioned outside of formal contexts.