<prompt> Translate the following text to EnglishKwa mfano, mapato ya riba juu ya dhamana ya serikali ya serikali na serikali za mitaa, ambayo hutumiwa hasa kwa madhumuni ya miundombinu, ni huru kutoka kwa kodi za shirikisho.  <response>: For example, interest income on state and local government bonds, which are used primarily for infrastructure purposes, are exempt from federal taxes. 