Zerodha is India’s largest stockbroker, trusted by over 10 million investors to trade and invest through platforms like Kite, Coin, and Varsity. As the company expanded into mutual funds, retail distribution, and financial education, its tax compliance needs became more sophisticated and large-scale.
To support this growth, Zerodha needed a centralized, real-time GST infrastructure that could integrate deeply with its internal systems and eliminate the inefficiencies of fragmented workflows.
CHALLENGE
Centralizing and Automating GST Workflows
With multiple business verticals and high-volume vendor interactions, Zerodha faced challenges in maintaining consistent and error-free GST compliance. Validating GSTINs during vendor onboarding was a manual, time-consuming process, leading to errors, delays, and follow-ups during return filing.
At the same time, e-Invoice generation had become a statutory requirement for many of Zerodha’s operations. But generating IRNs manually or through semi-automated tools wasn’t scalable. The team needed a reliable, programmable solution that could be tightly integrated into their systems and support real-time e-Invoicing at scale.
SOLUTION
Full-Stack GST APIs Integrated
Zerodha integrated directly with Sandbox’s GST APIs to bring automation and accuracy into its compliance workflows.
The Search GSTIN API enabled real-time validation of supplier and vendor GSTINs during onboarding and invoice generation. This helped ensure that every GSTIN entered into the system was legitimate, active, and correctly mapped significantly reducing mismatches and rework during return filing.
For e-Invoicing, Sandbox’s APIs allowed Zerodha to generate, manage, and cancel IRNs in real time, fully compliant with NIC requirements. E-Invoice generation was embedded directly into Zerodha’s invoicing systems, eliminating the need to manually upload JSON files or use external tools.
The result was a fully automated, seamless experience for internal finance teams without disrupting existing workflows.
RESULTS
Real-Time Compliance with Zero Operational Overhead
With GSTIN validation and e-Invoice generation embedded into its core systems, Zerodha was able to centralize compliance while keeping operations agile. Vendor GSTINs are now validated in milliseconds, ensuring clean data at the source. E-Invoices are generated and managed instantly, with zero manual steps.
This automation led to a 95% reduction in time spent on monthly compliance activities, fewer errors during filing, and faster response times during audits and reconciliations. Zerodha now operates with a GST infrastructure that is not only scalable and audit-ready, but also invisible to the teams that rely on it every day.
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