Tax Guide U.S. Corporation Income Tax Return: Form 1120 According to Investopedia.com, a corporation is a “legal entity that is separate and distinct from its owners. Corporations enjoy most of the rights and responsibilities that an individual possesses; that ... Tax Guide Shareholders’ Exclusive: Form 1120S Schedule K-1 Any shareholder of an S-Corporation need to use the Schedule K-1 of Form 1120S to report his or her pro-rated share of net income or loss from that ...