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Client-Focused Accounting Services just outside of Boston

Independently owned. Employee driven. Client focused.®

For over 45 years, Tonneson + Co has been helping clients like you thrive by offering expert advisory, tax and assurance services. We pride ourselves in offering best-in-class service, backed by experience and a desire to see you succeed. Our team of experts can offer personalized service and meaningful relationships that larger firms can’t. That means we can provide hands-on guidance tailored specifically to your needs.

Whether you’re an individual, a privately-held business, or a non-profit, our team is here to support you with trustworthy advice, timely communication, and up-to-the-minute industry knowledge. Based just north of Boston in Wakefield, MA, we are strategically positioned to offer top-tier advisory and CPA services to the greater Boston area and beyond.

#
largest firm in MA
+
countries represented by clients receiving our services
%
of senior leadership are women
x
winner of the Best Firms to Work For award
+
industries represented by our valued clients

Providing advisory, tax and assurance services you can trust for over 50 years.

Good relationships start with good values. Tonneson + Co supports our clients, our people, and our community by fostering a culture of inclusion, responsibility, and leadership.

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Diversity, Equity & Inclusion

Diverse group of employees in a group smiling at the cameraBroader perspectives mean better decisions. We strive to create a safe environment for our staff while expanding that message to our professional networks, advisors, and client base. Our internal DEI Committee is dedicated to empowering staff and creating a welcoming environment for all.

Work + Life Balance

Everyone deservesMan sitting at desk with computer with his son on his back fulfillment—in and outside of work. Remote-work opportunities and flexible hours help attract top-level talent and allow us to engage a more diverse team.

Professional Development

Two employees looking at an tablet togetherOur people are our greatest asset. By providing a mentorship program, ongoing training, and an open-door policy, we create a clear path to career advancement and give our employees the tools they need to thrive. This keeps our retention rates high and supports long-lasting client relationships.

Women’s Leadership

Woman leader at Tonneson smiling at cameraWe believe in the diversity of perspective and experience, so it’s no surprise that 50% of our firm’s leadership, managing directors, and higher, are female. Tonneson + Co provides the flexibility, support, and opportunity that allow women to advance their careers.

Social Responsibility

Group of employees volunteering at a local non-profit We believe in making an impact, so we’re passionate about giving back to our communities. We support a number of charitable organizations and empower our people to serve meaningful local causes, building relationships and connections in the process.

Education & Training

Two employees in a training sessoin looking at the front of the room The tax and business landscape is complex. Offering top-notch service means keeping up with industry updates and trends while developing new skills that enhance performance. A robust new-hire onboarding and continuous staff training result in outstanding service for our clients.

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