This is a sources sought notice for market research to identify vendors capable of providing Tax Notes Online subscription services for the IRS Large Business and International Division. The requirement is a one-year subscription for 60 users at the National Taxpayer Advocate and Headquarters offices, covering tax law publications and documents. The service must meet minimum technical requirements, including full-text search and compatibility as a Microsoft Teams certified app or integration. Interested vendors are asked to submit company information, business size, service literature, and compliance confirmation. Responses will support the government's acquisition planning and consideration of commercial best practices and pricing structures.