Corp., Inc., Corporation, Incorporated: used to denote corporations (public or otherwise). These are the only terms universally accepted by all 51 corporation chartering jurisdictions in the United States. However, in some states other suffixes may be used to identify a corporation, such as Ltd., Co./Company, or the Italian term S.p.A. (in Connecticut; see under Italy). Some states that allow the use of "Company" prohibit the use of "and Company", "and Co.", "& Company" or "& Co.". In most states sole proprietorships and partnerships may register a fictitious "doing business as" name with the word "Company" in it. For a full list of allowed designations by state, see the table below.
Limited liability companies must pay state fees during the incorporation process. These fees can be deducted from taxes. S-Corps must pay state fees to legally incorporate. These fees can be deducted from taxes. C-Corps must pay state fees to become legally recognized. These fees can be deducted from taxes. Non-Profits pay state fees when they incorporate. These fees can be deducted from taxes. Since Sole Proprietorships aren't incorporated entities, they don't pay formation or compliance fees.