Revenue modernization reduces unnecessary burdens on taxpayers while efficiently funding public services.”

Robin Sosin, Principal, Revenue/Tax Practice
Robin Sosin


Today’s public sector landscape is characterized by tight budgets and expanding demand for public services. Effectively administering tax laws to fund vital services is a core responsibility of state government. Through revenue program modernization, states are achieving higher levels of operational efficiency and effective tax collection.

CSG'S Expertise in Action

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Revenue Program Modernization in Oregon


The Oregon Department of Revenue (DOR) administers the State’s tax laws, operating and/or overseeing more than 30 revenue programs. To fulfill its central role in funding public services, DOR has established a vision toward a model of revenue administration through the strength of their people, technology, innovation, service, and collaboration. As a part of achieving this vision, DOR is undertaking a large-scale replacement of its core legacy tax systems. The system modernization is based on the implementation of an enterprise commercial off-the-shelf (COTS) solution.


DOR selected CSG to provide Quality Assurance and Independent Verification and Validation (IV&V) services to help the project achieve DOR’s objectives. CSG provides independent oversight of all aspects of the project – project governance and management, requirements management, adherence to schedule and budget, technical architecture, and risk identification and mitigation.

CSG is also performing a system vulnerability assessment, code reviews, test sampling, and quality reviews of all project management and architecture documents to assure that the implementation project meets the State’s management and quality standards.

Together, DOR and CSG are working to ensure that revenue programs effectively support the needs of Oregon stakeholders, reduce unnecessary burdens on taxpayers, and efficiently support the collection of tax revenue.

Illinois Cook County’s Integrated Tax Processing System


The Illinois Cook County Department of Revenue has implemented a new commercial-off-the-shelf Integrated Tax Processing System and associated infrastructure to more efficiently serve the county’s five million residents. The project is implementing improved business processes and consolidating technology to meet the challenges of tax administration in the 21st century.


DOR contracted with CSG to provide IV&V services for its multi-phased integrated tax system implementation project. CSG conducted an initial IV&V assessment followed by quarterly IV&V assessments of project processes, activities, and vendor deliverables throughout the design, testing, and implementation phases. CSG’s forward-looking assessments proactively mitigated project risks, provided DOR visibility into project health, and enabled effective decision making.

DOR has a vision for county-wide efficiency and improved customer services in tax processing systems. CSG is helping them see this vision through.

Michigan's Tax Program Modernization


The Michigan Treasury Department administers the State’s tax laws, and collects taxes for more than 30 government programs. The Department strives to manage taxpayer dollars effectively and efficiently, ensure operational excellence, and drive cost savings and better government through shared services. To achieve this vision, the State is modernizing their revenue/tax program.


Michigan Treasury selected CSG to provide full-service Project Management Office capabilities, including project leadership and oversight, revenue/tax expertise, process and workflow re-design, technical architecture and design, and testing and validation to support the State’s incremental modernization approach. Targeted modernization efforts include implementing a new system for Individual Income Tax (IIT), revenue sharing system payment update processes, audit system replacement, and enhancements leveraging the Governmental Liaison Data Exchange Program (GLDEP).

Together, Michigan Treasury and CSG are working to reduce unnecessary burdens on taxpayers and maximize tax collections.