RFI for International Tax Modelling Tool

The Internal Revenue Service is seeking information to identify a secure, agency-compatible software solution for modelling and analyzing complex international tax provisions under the One Big Beautiful Bill. The agency needs a tool that enables personnel to evaluate tax impacts and taxpayer planning strategies while supporting the integration of tax return data, such as XML ingestion. The requested scope of work covers the development and delivery of the tool, comprehensive user training, ongoing maintenance, and eventual integration of the solution into agency operations. Assuming the solution is customized for exclusive agency use, respondents must describe available options for ongoing support, including service models, service level agreements, and long-term maintenance considerations. The agency is requesting recommendations for appropriate pricing and contract structures, such as Firm-Fixed-Price, Labor-Hour, or Time-and-Materials, along with a supporting rationale. Respondents must also provide an estimated total cost to deliver the full scope, including recurring annual costs, and an estimated timeline for development and customization in weeks or months. Eligibility for this opportunity is restricted to onshore entities within the United States. The performance of the work will take place entirely offsite. Respondents must submit their digital responses via email or online, and the anticipated contract period will be for one year.