Over the past several years, there has been a steady increase in the number of resident taxpayers subject to the various taxes on income and net worth in Luxembourg. However, until now, no complete and up-to-date documentation has been available to guide taxpayers in the preparation of their tax returns. This book, which is both detailed and highly readable, is a practical response to that information gap. This first English edition is based on tax legislation which is effective in Luxembourg as at 31 December 2018 and provides guidance on how to complete the online corporate income tax, municipal business tax and net worth tax return for resident corporations and how to submit the mandatory electronic declaration. This book undertakes a page-by-page analysis of the tax return form for commercial companies and the annexes to that form and draws attention to the most important laws, regulations and administrative circulars currently in force. The book also incorporates many practical examples. These features make this book an ideal reference guide for resident corporations in Luxembourg.