GAGNON forms carefully chosen alliances with specialized providers to ensure seamless, comprehensive and best-in-class services for our client.

Our Strategic Alliances

To learn more, please click on the partner logos below.


CCH, a Wolters Kluwer business produces sales and use tax information and compliance tools that provide timely and accurate tracking and reporting of sales and use tax rates in more than 7,500 jurisdictions in the U.S. and Canada. In addition, the company offers a line of specialized database and software products for businesses in especially complex sales and use tax environments, including the telecommunications, retail, utilities, food, and grocery industries.

GAGNON provides in-depth knowledge and proficiency with the CCH products that enables mutual customers to derive the most benefit from their tax processes. The Firm works with clients in a collaborative method to take advantage of the vast research and sales and use tax product offerings provided by CCH, assisting with the integration of these technology tools within our clients’ financial applications.

Draper Tax Consulting

Draper Tax Consulting combines over fifteen years of “Big 4” accounting firm fixed asset experience with a commitment to high level client service for both large and small companies. The services we provide through Draper Tax Consulting save taxes and improve cash flow. Utilizing cost segregation, tax-based depreciation analyses and real and personal property tax reduction, we are frequently able to substantially reduce the overall cost of carrying assets.


GAGNON partners with Vertex, Inc. to provide a comprehensive technology solution, leveraging our tax and technology experience.  Our trained professionals are dedicated to providing clients with the resources they need to integrate the Vertex systems, including income tax and transaction tax, with SAP, Oracle, PeopleSoft, Lawson, and JD Edwards.

Our transaction and income tax experts bring extensive background in tax technical, process and technology skills, representing a wide range of service capabilities.  This combination enables our professionals to provide several levels of consulting services including feasibility studies, software installation, data extraction and transformation services, and complete turnkey implementations which provide for the comprehensive solution to the tax compliance process.


ISSI provides industry-leading, Sarbanes-Oxley Compliant, SAS70/Level 2 Electronic Certificate Management (ECM) solutions that give you control over your document management governance and processes cost-effectively.

GAGNON works with ISSI to provide companies a solution for certificate and image management, ensuring a high level of compliance in sales tax audits. Combining the experience with various applications, from ERP providers to tax automation products, and market knowledge of imaging will allow companies functionality that has previously been difficult to attain.


Sabrix, Inc. is a proven expert in transaction tax management, enabling finance, tax, and IT professionals to achieve accurate, timely, and cost-effective compliance for sales tax, use tax, value-added tax (VAT), and industry-specific taxes and fees.  The company’s flagship product, the Sabrix Application Suite, empowers Global 2000 companies to manage transaction tax with consistent accuracy, control, and efficiency.  The Sabrix Application Suite is an enterprise-class, centralized transaction tax management system that seamlessly connects to all financial applications requiring the determination, calculation, and recording of transaction taxes. With Sabrix, a company has a single transaction tax solution and a single system of record for transaction tax compliance, with distributed management and control for geographically dispersed tax professionals. The Sabrix Application Suite has been implemented at global enterprises across a variety of industries, including, BASF, Cisco, DTE Energy, IBM, QUALCOMM, Sportsman’s Warehouse, and York International.

The relationship is built around GAGNON’s ability to complement the Sabrix product with their knowledge of the tax industry and the technology that surrounds it. With constant changes in the sector, providing tax technology services such as migration from older and out-of-date tax software to state-of-the-art systems such as the Sabrix solution will have a positive effect on the market.

Tax Technology Services

Tax Technology Services (TTS) is a rapidly growing Sales tax Exemption Processing and Certificate Compliance Solutions provider with a commitment to quality customer service. TTS offers CertCaptureTM, a leading solution for the automation of compliance in Exemption Certificate Management – without regard to client’s computing platform, and CertKeeper, a tool to help ensure the appropriate tax certificates are sent out – even if by non-tax staff members  TTS is a member of all of the leading Sales Tax associations and the Streamlined Sales Tax Business Advisory Council for Exemption Certificates. TTS is located in Raleigh, NC and privately held. For more information, visit

GAGNON works with CertCapture and CertKeeper to provide companies a solution for certificate and image management, ensuring a high level of compliance in sales tax audits. Combining the experience with various applications, from ERP providers to tax automation products, and market knowledge of imaging will allow companies functionality that has previously been difficult to attain.

Rex Halverson & Associates, LLC

GAGNON often partners with Rex Halverson & Associates, LLC to better serve its clients.  Rex Halverson & Associates, LLC represents individuals, professionals, businesses, and corporations throughout the United States, consulting on a comprehensive range of state and local tax issues.  Firm's fields of expertise include franchise, income, sales and use, property, and employment tax matters, as well as California Enterprise Zone Designation Applications, expansions and credits.

Rex Halverson & Associates, LLC is committed to providing the highest level of client services and offers extensive experience across many industries including leasing, computer hardware, software, banking, motion picture, printing, transportation, utilities, manufacturing, agriculture, and retail.

Company's founder, Rex Halverson, is a tax attorney with over thirty years of state and local tax experience.  Prior to founding Rex Halverson & Associates, LLC in September 2005, Mr. Halverson was the Practice Leader of a Big Four Firm’s Western Region State and Local Tax Controversy & Consulting Practice for seven years.  Mr. Halverson previously served as California’s Deputy States Controller under Kathleen Connell, and also acted as an advisor to Governor Schwarzenegger’s Tax Committee. Mr. Halverson began his extensive tax career at Bank of America NT&SA in San Francisco.  Mr. Halverson is an active member of California’s State Bar Association and its Taxation Section.