I have been running a cleaning business for over 10 years now, North Shore Maids. This year I just opened a new office under a new business name North Shore Clean, which focuses on office cleaning and full janitiorial services. North Shore Maids has been providing mostly Residential Cleaning Services. My question is.. can I run both of these business under only 1 tax id and one bank account, etc. as to simplify things and save money? I'm running both businesses and they are now both doing successfully. I have not had any income until recently with North Shore Clean, but now I want both of these companies to operate as one basically, but not losing the names. They are not incorporated or anything, just run as a dba.