This document provides an overview of Philippine taxation. It begins with definitions of taxation and discusses principles like the necessity of taxes to fund government. It describes different types of taxes according to criteria like subject, burden, determination of amount, and purpose. Key points include taxes being compulsory, levied by the state for public purposes, and classified as direct or indirect. The document also covers tax system objectives, stages of taxation, laws, and the power and limitations of taxation. It discusses concepts like double taxation, tax exemptions, and interpreting tax laws. The last sections focus on income taxation principles and computing individual income tax.