Tax Calculation Engine Development & Maintenance

The Internal Revenue Service seeks a contractor to develop and maintain a centralized tax calculation engine designed to support IRS forms in the 1040 series and major business tax forms, ensuring accurate, reliable, and up-to-date tax computation capabilities. The engine must be accessible via a secure API to enable integration with internal and third-party systems and must be built to rapidly incorporate legislative changes as they occur, minimizing delays in compliance and reducing the risk of calculation errors due to outdated rules. The system is expected to handle complex tax scenarios, including deductions, credits, phase-outs, and filing statuses, while maintaining high availability and scalability across user loads. The contract is structured as a subcontract with a NAICS code of 541511, indicating it falls under Custom Computer Programming Services, and is open for response until May 12, 2026. The work is being performed on behalf of the Department of the Treasury, though no specific place of performance or point of contact details are provided. Contractors are expected to demonstrate proven experience in building and maintaining high-stakes tax or financial systems with rapid update cycles, ensuring continuous alignment with evolving federal tax law and IRS standards. There is no set-aside designation, meaning all eligible entities may compete, and the focus remains on technical excellence, system reliability, and the ability to deliver timely, accurate tax computations under tight legislative timelines.