This document provides guidance on accounting for uncertain tax positions under a new IFRS Interpretation. The Interpretation establishes a two-step process for recognizing and measuring uncertain tax positions: 1) Determine if it is probable the tax authority will accept the position, and if not, recognize an additional liability. 2) Determine if the most likely outcome or expected value method better predicts resolution and apply accordingly. It will be effective for annual periods beginning on or after January 1, 2019, with early adoption permitted. Transition allows either retrospective application under IAS 8 or recognition of the cumulative effect on the date of initial application.