Armanino Expands Sales & Use Tax Expertise with Addition of New York-based Sales Tax Defense

SAN RAMON, Calif.--(BUSINESS WIRE)--Armanino, one of the 20 largest accounting and business consulting firms in the U.S., today announced that the team from Sales Tax Defense, a leading firm specializing exclusively in sales and use tax matters, has joined the firm. This addition expands Armanino’s capabilities in this highly specialized area, allowing the firm to better support clients facing multi-state compliance, audit defense, and dispute resolution challenges.

Since 2008, Sales Tax Defense has built a reputation as the go-to partner for businesses navigating complex sales and use tax requirements. The firm’s professionals combine deep technical expertise with a thorough understanding of tax law and administrative processes—guiding clients on what to file, when to file, and how to defend their position. This focused expertise, coupled with increasingly complex tax law, complements Armanino’s broader tax practice and strengthens its position as a comprehensive resource for clients with sophisticated needs.

“This is a powerful combination that significantly strengthens our tax consulting capabilities,” said Matt Armanino, CEO of Armanino Advisory LCC. “Sales Tax Defense brings a team that lives and breathes sales and use tax, and equally important, understands the need to deliver superior outcomes for clients through exceptional service, and we couldn’t be more excited to have them on our team moving forward.”

“Joining Armanino allows us to bring our specialized experience to a broader range of clients, including larger enterprises that are increasingly facing complex multi-state challenges,” said Mark Stone, CPA, MST, managing partner of Sales Tax Defense. “Together, we can offer deeper resources and additional capabilities, while ensuring our clients and the CPAs that we work with, continue to benefit from the hands-on approach Sales Tax Defense is known for.”

The complexity of multi-state sales and use tax compliance has surged since the 2018 U.S. Supreme Court’s Wayfair decision, which expanded states’ ability to require out-of-state businesses to collect and remit sales tax. As more states increase audit activity and broaden their enforcement efforts, businesses face unprecedented challenges in understanding where and how they owe tax.

For years, Sales Tax Defense has worked to simplify that complexity through client education—hosting more than 50 seminars annually to help businesses understand nexus rules, filing obligations, and proactive compliance strategies. By joining Armanino, they can now pair that educational mission with Armanino’s advanced tax technology, automation, and data analytics capabilities, empowering clients with greater visibility, accuracy, and control over their compliance operations.

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"Armanino" is the brand name under which Armanino LLP and Armanino Advisory LLC, independently owned entities, provide professional services in an alternative practice structure in accordance with law, regulations, and professional standards. Armanino LLP is a licensed independent CPA firm that provides attest services, and Armanino Advisory LLC and its subsidiary entities provide tax, advisory, and business consulting services. Armanino Advisory LLC and its subsidiary entities are not licensed CPA firms.