International Tax Software Development

The contract seeks the design and development of a specialized software platform to model U.S. international tax rules, including the Tax Cuts and Jobs Act (TCJA), the OECD’s Base Erosion and Profit Shifting (BEPS) framework referred to as OB3, and pre-TCJA tax regulations. The platform must support precise rule-based calculations, dynamic scenario modeling, and the ability to adapt to future legislative changes without requiring extensive reprogramming. It is intended to serve as a robust analytical tool for tax compliance, forecasting, and policy evaluation within the Internal Revenue Service. The system must be scalable, accurate, and capable of handling complex cross-border tax structures with high levels of data integrity and auditability. This is a subcontract under the Department of the Treasury’s IRS, with performance required in Washington, DC, specifically at the 20011 ZIP code. The solicitation was posted on May 26, 2026, and responses are due by July 17, 2026, at 4:00 PM Eastern Time. The North American Industry Classification System code is 541511, indicating it fall under Custom Computer Programming Services. There is no specified set-aside type, and the contract is open to eligible subcontractors with proven expertise in tax modeling, software development for federal agencies, and experience with complex regulatory environments. The system must be built with long-term maintainability in mind, ensuring it remains functional and up to date as international tax laws evolve.