The Compliance Handbook serves as the core reference for HMRC staff on how to assess, audit and enforce tax compliance across all taxpayer segments. It articulates the principles of risk‑based assessment, detailing how HMRC identifies high‑risk behaviours through data analytics, whistle‑blower tips and audit trails. The handbook outlines the step‑by‑step process for initiating compliance checks, from initial contact and information gathering to detailed examination and potential enforcement actions. It explains the range of tools available to HMRC, including detailed record‑keeping audits, on‑site visits, and the use of digital monitoring platforms that flag anomalies in filed returns. The manual also describes the escalation of cases to the Criminal Investigation branch when evidence suggests deliberate wrongdoing, outlining the criteria for such referrals. Additionally, it provides guidance on handling taxpayer appeals, the rights of taxpayers during investigations, and the mechanisms for settlement agreements. The handbook stresses the importance of fairness, transparency and consistency, requiring officials to apply the same standards across comparable cases. It also incorporates updates on legislative changes, such as the introduction of new reporting obligations for digital platforms, and offers practical examples of common compliance pitfalls, such as mis‑declared income from overseas sources or errors in VAT calculations. By adhering to the procedures set out in this handbook, HMRC aims to maintain public confidence in the tax system and deter tax evasion.
https://www.gov.uk/hmrc-internal-manuals/compliance-handbook