In this course, we discuss the common errors practitioners make on S corporation tax returns that review staff often miss. The intent is to sharpen reviewers' skills by examining four case studies and discussing issues where additional information from the client may be warranted and areas of tax law where proper treatment requires additional analysis and information. Matters addressed include income, deductions, K-1 reporting, and K-2 and K-3 reporting. This course follows a highly illustrative case study format to increase participant comprehension and retention.