All communications service providers (CSPs) face a wide array of taxation challenges, but one of the biggest variables of all is location. Seemingly simple, it is in fact riddled with complications. Pinpointing customer location at a granular level is critical for tax compliance and overall profitability. However, the most commonly used methods for identifying location for tax purposes are surprisingly unreliable. This whitepaper examines five methods and outlines how CSPs can resolve common location errors.