Seisan worked directly with financial experts to understand the unique tax workflows and business logic that governed the calculation engine. Success depended on creating a platform that was both technically robust and tightly aligned with the accountants’ daily workflows.
Provide a more efficient way to manage tax provision workflows across multiple jurisdictions and business entities.
Seisan delivered a custom web-based enterprise tax provision and compliance platform enabling users to import, process, and analyze large volumes of accounting data for tax calculation and reporting.
A financial accounting firm specializing in complex tax calculations and reporting for multinational corporations, needed a more efficient way to manage tax provision workflows across multiple jurisdictions and business entities. Their team required a secure, scalable, enterprise-grade platform capable of importing and consolidating large volumes of accounting data, performing complex calculations, and delivering transparent, repeatable reporting. This company partnered with Seisan to modernize this workflow and build a web-based system tailored to the rapidly evolving needs of global tax compliance.
Tax provision and compliance management for multinational organizations presents a unique and highly technical set of challenges. Internal accountants and tax managers were previously burdened with outdated tools that lacked scalability, consistency, and modern data handling capabilities.
Core challenges included:
Additionally, the project involved entering a completely new industry vertical for Seisan— with deep, nested financial logic and highly precise calculation expectations.
Seisan worked directly with financial experts to understand the unique tax workflows and business logic that governed the calculation engine. Success depended on creating a platform that was both technically robust and tightly aligned with the accountants’ daily workflows.
The collaboration focused on:
This was a completely direct partnership—no third parties—allowing Seisan to move quickly and iterate efficiently.
The web-based tax calculation platform is built on a modern, containerized full-stack architecture designed for scalability, maintainability, and performance.
The frontend is developed using React with Material-UI to deliver a responsive, intuitive user experience, supported by React Context for state management and custom data-table components that enable advanced filtering and data interaction. The backend runs on Node.js with an Express framework, leveraging Sequelize as the ORM to manage structured data and enforce business logic, while JWT-based authentication ensures secure user access. Data is stored in a PostgreSQL database, and the entire application stack—frontend, backend, database, and administrative tools—is deployed using Docker and Docker Compose to provide consistent environments, simplified deployments, and reliable infrastructure management.
Tax prep professionals spend considerable time on screens, a challenge Seisan addresses with a customizable view system. Users can personalize their display using options like Default Grayscale, Sea Green, Tulip Tree, Sunrise Orange, or Blue Hosta. This system mitigates eye strain by allowing professionals to select their preferred visual setting for enhanced comfort.
White label opportunities provide a strategic avenue for market expansion and revenue diversification. XS Tax Provision, for example, is inherently designed for effortless licensing and resale, enabling partners to rebrand the solution with minimal effort or rebuilding. This streamlined adaptability facilitates rapid market entry and broadens product reach, offering significant potential for new business development.
To ensure accuracy, reliability, and trust— critical in financial applications—Seisan employed:
Once approved, the application was deployed into a production environment with full readiness for real-world tax cycles.
Our partner now operates on a modern, scalable platform that dramatically improves their ability to manage global tax provision and reporting:
The application enables our partner to manage complex multinational tax scenarios with greater speed and reliability, positioning the firm for continued growth and operational efficiency.
