Library / Goods and Services Tax: The Professional's Master Guide

Preface

GST completed nine years on 1 July 2026. In that time the law has changed more often than most of us can remember: new returns, new tables, new rules on credit, e-invoicing, the Invoice Management System, a fresh demand section, and in September 2025 the largest rate rationalisation since launch. The GST Appellate Tribunal has finally started work. For a practising professional, keeping a single, reliable picture of the law has become a job in itself.

This guide was written to be that picture. It explains the GST law in plain words, one concept at a time, with the section and rule beside each point and worked illustrations built the way a working paper is built. It does not stop at quoting the provision. It explains why the rule exists, how it plays out in returns and books, what the department usually questions, and what the courts have said.

The coverage runs from the constitutional base and the meaning of supply, through valuation, time and place of supply, input tax credit, registration, invoices, returns, payment and refunds, to sector topics, assessment, investigation, appeals, penalties, accounting and reconciliation. Fifteen comprehensive case studies bring the chapters together, and the appendices collect the section map, rates, forms, due dates, time limits, practice questions, checklists and specimen replies.

The law is stated as on 28 September 2026. Where an amendment has been enacted but not notified, or where the position is still settling in the courts, the text says so. Suggestions and corrections from readers are welcome and will be taken into the next edition. Readers who also handle direct tax work may use this book alongside the companion guide on the Income-tax Act, 2025.

Vipin Nair

Ahmedabad, 28 September 2026