For subscription-based and SaaS companies, billing compliance is crucial for managing the complex intersection of billing, accounting, and regulatory requirements to ensure accurate revenue collection and financial reporting. The demand for enterprise billing solutions is growing significantly, with the market expected to expand from $4.57 billion in 2024 to approximately $5.29 billion in 2025, driven by the need for sophisticated systems capable of handling recurring billing cycles, multiple pricing models, and complex revenue recognition requirements. Accurate billing data is essential for making strategic business decisions, and companies with advanced usage-based systems experience higher net revenue retention. Modern SaaS companies must navigate a complex regulatory landscape, including frameworks like PCI DSS, GDPR, CCPA, and ASC 606/IFRS 15, which require robust billing systems for compliance. The shift towards usage-based billing models presents new compliance challenges, necessitating systems that can process high volumes of events with sub-second latency and manage complex pricing calculations. Automated billing systems are vital for ensuring compliance, reducing errors, and improving operational efficiency, with the enterprise billing software market projected to grow significantly by 2033. Investing in scalable infrastructure and maintaining customer transparency are essential best practices for achieving billing compliance, which is a strategic advantage for SaaS companies aiming for sustainable growth.