IF YOU INVEST MONEY AND EMPLOYMENT IN BUSINESS TO LOSE MONEY, HOW TAXES WORK?

I wish to begin work as well as how most appropriate to income taxation as well as corporate taxation gain for acquiescence of taxation declarations in between a business, we consternation because we even proposed to remove money. But it gain to a DBA so we work dual jobs to have claims for detriment of gain as well as investment planning, personal detriment is not?