This document provides an overview of arbitrage and arbitrage compliance. It defines arbitrage as the difference between tax-exempt borrowing rates and taxable investment yields. If investments earn more than tax-exempt bonds, the excess earnings must be rebated to the IRS. It provides an example showing positive, no, and negative arbitrage scenarios. It outlines important rebate compliance dates and payment requirements. The document explains that issuers must comply with arbitrage rules because tax-exempt borrowing is a privilege and noncompliance can result in bonds being declared retroactively taxable or IRS penalties. It also describes the voluntary closing agreement program that encourages self-reporting of violations.