April 23, 2007 5:45 AM EDT
For any contractual matters, you should identify the actual names of your business as the signatory, indicating something like "Q, Inc. d/b/a XYZ." I also assume you have properly registered your d/b/a under a fictitious name registration in your state of incorporation.
You don`t need to use "Q, Inc." in all marketing or advertising materials (like a website), which is the point of a d/b/a.
You may be able to find more information at the sba.gov site.
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