Derecho tributario
Tax law or revenue law is an area of legal study in which public or sanctioned authorities, such as federal, state and municipal governments (as in the case of the US) use a body of rules and procedures (laws) to assess and collect taxes in a legal context. The rates and merits of the various taxes, imposed by the authorities, are attained via the political process inherent in these bodies of power, and not directly attributable to the actual domain of tax law itself.