Is it permissible for a husband to conceal his business profits from his wife?

A husband is not obligated to inform his wife of his business profits or his money. However, there is no objection to reaching an understanding with him and convincing him to do so if there is a benefit. If the husband refuses to inform her, there is no sin upon him, and this does not necessarily indicate a lack of trust in her. It should not be a cause for disagreement.