S corporation shareholders have an added reason to worry about their company's annual performance: It has a direct impact on their own income taxes. How It Works Unlike a regular C corporation, an S corporation usually doesn't pay federal income taxes itself. Instead, each shareholder is allocated a portion of the corporate income, loss, deductions, and credits on a special "K-1" tax form. The shareholder then must report the items listed on the K-1 on his or her personal tax return. The … [Read more...] about What’s Taxable to an S Corporation Shareholder?