Is an inc business already copyrighted or do I have to copyright it myself?

You are most likely referring to a trademark to protect your corporate name rather than a copyright. A trademark identifies a particular source of goods or services from those of another source. Trademark examples include VerizonR and AppleR. A copyright is a form of protection provided to authors of "original works of authorship," including literary, artistic, musical, dramatic, and certain other tangible works.

You cannot copyright a business. You can copyright only a work of art. The name of your business is protected by the trade name that you provided when you became incorporated in your state.

You cannot copyright a business. Are you referring to trademarks?

Incorporation and a copyright are completely different things. Furthermore, neither will protect your business name. The name of a business can be protected as a trademark. Based on the questions you are asking, I urge you get professional help rather than trying to do these things yourself. It is dangerous to rely on self-help in a subject area you do not understand. Even if you learn enough to successfully file documents etc., in the event of dispute later on, you may find that you have done is ineffective. By then it may be too late to fix and/or change the situation.

A business name cannot be protected by US Copyright Law. Likewise, a business name cannot be protected by US Trademark Law. Most states will not allow two companies to be formed under state law - if they have the same or very similar names. Different states however - may allow duplicate (or more) company names to exist. To be unique - search GOOGLE or BING for your company name.

You cannot copyright a business, no matter what it's structure. Copyright only covers the expression of an idea - such as a book, a movie or TV show, a work of art, computer software programs, an architectural design, choreography, etc. You also can't trademark or copyright the name of your business.