Disclaimer: This is a general discussion about southern Nevada - the specifics on DBA/Fictitious Name can vary from county to county and state to state.
Many times people are confused about needing a Fictitious Name/Doing Business As (DBA) for their corporation. In general, you Fictitious Name if you are operating under a different business name then the legal name of the company.
For example, you start a business with your brothers and you set up Four Brother's Company, Inc. But then you decide to go into the auto repair business and you want a name more appropriate to the services you offer. Since you already have a company with years worth of business experience and, more importantly, business credit, you may not want to start a new business.
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In many situations, you can for a nominal fee of $20-$50 file a Doing Business As or Fictitious Name with your county clerk's office allowing you to legally operate and advertise your business in the new name. In is important to note that you may be required to have a business license for BOTH the base name of your business and the DBA. It is important to research such information carefully such requirements.
In general, you will only need the Fictitious Name/DBA in those cases where you are operating with a different name. If your business is TUVW Trucking and your advertising is in TUVW Trucking and your trucks are painted with TUVW Trucking, it is most likely that you do not need a DBA.
Sometimes people who are setting up a Nevada Corporation or LLC are told by the people that are selling them the package that the DBA is required and will charge them $100 or more for the process. Clark County, Nevada currently only charges $25 for the actual filing (which can be mailed in - does not have to be done in person) and it is valid for 5 years.