Governing the Subscription Economy: A critical review of internal controls over SaaS revenue recognition under ASC 606

The rapid expansion of the Software-as-a-Service (SaaS) business model has created significant challenges for traditional financial reporting and internal control systems designed for transactional, product-based revenue models. These problems have been compounded by the adoption of ASC 606 (Revenue from Contracts with Customers) because subscription-based, usage-based and hybrid pricing schemes present complex multi-element performance obligation which past control architectures were poorly designed to handle. This study conducts a structured literature review of peer-reviewed research, regulatory filings, and practitioner guidance published between 2020 and 2025. The review also incorporates insights from SEC 10-K filings and SOX 404 disclosures of publicly traded SaaS firms. The thematic areas include the evolution of control architecture, the heterogeneity in the implementation of ASC 606 (Revenue from Contracts with Customers), auditability challenges in cloud-native systems, and model-specific control maturity. The literature consistently identifies five recurring factors associated with material weaknesses in SaaS revenue recognition, namely the lack of disaggregation of performance obligations, limited automation in subscription billing systems, the absence of IT general controls under cloud shared-responsibility models, under-resourced accounting functions in high-growth environments, and systemic weaknesses in contract modification governance. Organizations that have successfully addressed these weaknesses typically implement integrated Order-to-Cash platforms with embedded control checkpoints and real-time auditability. The strong internal controls in the recognition of SaaS revenue demand the paradigm shift of the retrospective and transactional based verification to the continuous and embedded assurance structures in systems. This review proposes practical internal control frameworks and a control maturity model designed to strengthen SaaS revenue recognition governance and reduce material weakness disclosures.