This is an e-book to help you understand how to use HMRC's digital tool Check Employment Status for Tax (CEST). Rebecca Seeley Harris is an expert in IR35, off-payroll working and self-employment and has written this book with her extensive knowledge of case law and the CEST tool. The book is updated to April 2024 and includes the latest case law that has been used by HMRC to test the tool's efficiency.