About Us

We have become known for giving trustworthy counsel that genuinely has our clients’ best interests in mind. Tonneson + co offers expertise in assurance, corporate tax, mergers and acquisitions, global accounting services, individual and fiduciary tax, and more.

Our firm is headquartered in Wakefield, Massachusetts. Tonneson + co is an independent member of the Geneva Group International, one of the world’s leading global alliances of independent law, accounting, and consulting firms. In 2020, our firm was named a GGI Member Firm of the Year.

Tonneson + Co was one of three firms worldwide to have been named Member Firms of the Year in 2020 by Geneva Group International (GGI) in recognition of the quality of our services.

Learn about our company's core values.

Tonneson + Co has a strong company culture that emphasizes:

We are proud to be named to Accounting Today’s 2020 list of Best Accounting Firms to Work For. Our firm was also named a Best Accounting Firm to Work For in 2019, 2018 and 2016.

Tonneson + co was named to Accounting Today’s Best Firms for Technology list in 2019, recognizing firms that are “embracing technology and leveraging it to build more responsive, more profitable and more sustainable practices.”

Employee Empowerment

When we say that we are an employee-empowered firm, we mean it. We frequently ask for feedback from our employees, ensuring that every employee’s voice matters and is heard. The input that we get from employees through venues such as surveys, town hall meetings, and small group discussions helps to shape the future direction of our firm.

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Tonneson + Co was one of three firms worldwide to have been named Member Firms of the Year in 2020 by Geneva Group International (GGI) in recognition of the quality of our services.

Learn about our company's core values.

We are proud to be named to Accounting Today’s 2020 list of Best Accounting Firms to Work For. Our firm was also named a Best Accounting Firm to Work For in 2019, 2018 and 2016.

Tonneson + co was named to Accounting Today’s Best Firms for Technology list in 2019, recognizing firms that are “embracing technology and leveraging it to build more responsive, more profitable and more sustainable practices.”

Employee Empowerment

Interested in exploring how we can work together? Reach out.