Various techniques are provided for establishing financial transaction rules to control one or more subsidiary financial accounts. In one embodiment, a financial account management application stored on a processor-based device may provide an interface for defining financial transaction rules to be applied to a subsidiary account. The financial transaction rules may be based upon transaction amounts, aggregate spending amounts over a period, merchant categories, specific merchants, geographic locations, or the like. The device may update the financial transaction rules associated with a subsidiary account by communicating the rules to an appropriate financial server. Accordingly, transactions made using the subsidiary account by a subsidiary account holder may be evaluated against the defined rules, wherein an appropriate control action is carried out if a financial transaction rule is violated.