Meet Us

GAGNONtax works closely with professionals nationwide to solve their tax challenges, using creative strategies and expertly-crafted technology. We have the expertise and experience of the Big Four, but not the layers of people and processes. Whether it’s through our tax consulting, tax compliance, or tax technology practices, we look at your specific challenges to find the perfect balance between risk and reward.

We believe that tax strategy requires art and science, both of which we warmly embrace. That enables us to see our clients as individuals and to infuse as much flexibility as possible into meeting their needs. Another reason our clients are so confident in their tax strategies is the access they have to our technology support team and our senior GAGNONtax professionals. Our team’s experience and expertise are unsurpassed, but their availability is unobstructed.

One more crucial difference about working with GAGNONtax? We look at tax strategy and technology from a perspective different than the others, three of them in fact. We look at your tax challenges from the perspectives of:

The Past

Have we left opportunities on the table? Or skeletons in the closet?

The Present

Are we taking advantage of current opportunities and identifying all material risks?

The Future

What's happening in our business and our world that presents us with new challenges?

It all comes down to this: We believe that tax strategy is not about numbers. It is about people, and helping them is the reason we are here.


Meet the Partners

Our partners have more than 140 years of combined tax, accounting, and technology experience. Care to meet them?

Founder & President

As Founder and President of GAGNONtax, Bill brings a unique perspective to the industry with a focus on delivering the benefits of big firm-quality services to GAGNON’s clients with the dedication and service that one would expect from a smaller firm.

Partner, Vice President

Paul Naehle serves a full range of clients from start-ups to the Fortune 500. His areas of expertise span across tax technical consulting, multistate tax recovery, state and federal research credit studies, audit support, controversy representation, and expansion-based credits and incentives.


Since 1997, Carl Roscoe has worked on a wide spectrum of state and federal corporate tax issues and projects. He has significant experience in income/franchise/gross receipts, sales/use, property and payroll tax matters. Currently, he focuses primarily on merger and acquisition due diligence, mitigation/remediation of historical tax exposure, and on emerging company tax concerns. Carl joined GAGNONtax in 2001, where he also serves as general counsel.


Mike Hayes is the Partner in charge of EnterpriseGt, part of GAGNONtax’s Tax Technology Solutions. His client base includes clients across industries including manufacturing, distribution, construction, retail, hospitality and technology. At these clients his focus is on automating transactional sales and use tax functions through third party vendors such as Thomson Reuters and Vertex or custom in-house builds.



Meet Our Clients

From manufacturing and distribution, retail, healthcare to medical devices, media, and financial services, our tax consulting experience spans most all verticals. With this expertise, GAGNONtax aligns your unique business to technical requirements through a team familiar with your vertical in a wide range of scenarios. That ensures a successful project from initial assessments through testing and production.

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