Incentives for Successful Companies Act of 2010 - Amends the Internal Revenue Code to allow through 2014: (1) certain businesses designated as successful companies a business-related tax credit for job training expenses; and (2) an increase to $250,000 in the expensing allowance for depreciable business assets placed in service by such companies. Defines a "successful company" as a U.S. company or enterprise that maintains a long-term U.S. growth plan, meets certain financial and creditworthiness criteria, and had an average of not fewer than 5 or more than 500 employees in the most recent calendar year.