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We are passionate about building the future model of business.
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Life at Tonneson + Co

At Tonneson + Co, we look for the best, brightest, most passionate people to power our vision and help move our clients forward. Come bring your authentic self to an environment rooted in collaboration, connection, development, and growth. We’re looking for people who value relationships and are excited about helping our clients thrive. If that’s you, apply for one of our open positions today!

Our client’s confidence in us comes from our team of smart, dedicated professionals. We serve our clients with expert advice, of course, but our commitment doesn’t stop there. We also focus on building relationships with our clients, and with each other, that contribute to a climate of trust, accountability, and community for all.

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Tonneson + Co

tonnesonandco

619

CPA and business advisory eirmlndependently owned. Employee driven. Client focused

Wow, what a night we had at the @MassCPAs Sip & Socialize event at Stillwater! We had the chance to connect with bankers, lawyers, and financial experts — it was a night filled with great food and even greater conversations! A big thank you to the team behind this amazing event, we’re excited for the next one!

#Networking #MassCPAs #ThisisTonneson

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Wow, what a night we had at the @MassCPAs Sip & Socialize event at Stillwater! We had the chance to connect with bankers, lawyers, and financial experts — it was a night filled with great food and even greater conversations! A big thank you to the team behind this amazing event, we’re excited for the next one! #Networking #MassCPAs #ThisisTonneson

To celebrate our latest promotions, we`re kicking off New Shareholder Spotlights this week! Here`s what Greg had to say regarding his recent promotion.

Congrats, Greg! We can`t wait to see all the great things you`ll do in your new role. 🙂

#ThisisTonneson

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To celebrate our latest promotions, we're kicking off New Shareholder Spotlights this week! Here's what Greg had to say regarding his recent promotion. Congrats, Greg! We can't wait to see all the great things you'll do in your new role. 🙂 #ThisisTonneson

Exciting news at Tonneson + Co! We are thrilled to share that Krissy Moriarty and Greg Wade have been promoted to Shareholder. Their hard work, expertise, and unwavering commitment to our clients and team have earned them this incredible milestone.

We look forward to seeing their continued impact on our success and the future of Tonneson. Congratulations!

#Leadership #ThisisTonneson

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Exciting news at Tonneson + Co! We are thrilled to share that Krissy Moriarty and Greg Wade have been promoted to Shareholder. Their hard work, expertise, and unwavering commitment to our clients and team have earned them this incredible milestone. We look forward to seeing their continued impact on our success and the future of Tonneson. Congratulations! #Leadership #ThisisTonneson

In celebration of our anniversary, here`s a heartfelt message from our CEO, Richard Mastrocola:

"Fifty years ago, Tonneson was established with a vision to be more than just a service provider—we aimed to be a trusted advisory and partner, helping our clients and communities achieve lasting success.

Today, as we mark fifty years in this industry, I am deeply grateful for our dedicated team, loyal clients, and supportive community who have made this milestone possible. Your unwavering support and commitment have been the cornerstone of our journey.

This anniversary not only reflects our past achievements but also signifies our future aspirations. With exciting growth plans for the coming year, including expanding our service offerings and enhancing our client experience, I am confident that Tonneson`s best chapters are yet to come. We are committed to innovation, sustainability, and fostering strong relationships as we move forward.

At Tonneson, we pride ourselves on offering expert advisory, tax, and assurance services tailored to the unique needs of our clients. Our commitment to quality service, backed by our experienced team, has been the foundation of our success. We are dedicated to maintaining our reputation for trustworthy counsel and personalized service that genuinely has our clients` best interests in mind.

Thank you for being part of our story and for believing in our vision. Together, we will continue to achieve great things."

#Cheersto50Years #50thAnniversary #ThisisTonneson

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In celebration of our anniversary, here's a heartfelt message from our CEO, Richard Mastrocola: "Fifty years ago, Tonneson was established with a vision to be more than just a service provider—we aimed to be a trusted advisory and partner, helping our clients and communities achieve lasting success. Today, as we mark fifty years in this industry, I am deeply grateful for our dedicated team, loyal clients, and supportive community who have made this milestone possible. Your unwavering support and commitment have been the cornerstone of our journey. This anniversary not only reflects our past achievements but also signifies our future aspirations. With exciting growth plans for the coming year, including expanding our service offerings and enhancing our client experience, I am confident that Tonneson's best chapters are yet to come. We are committed to innovation, sustainability, and fostering strong relationships as we move forward. At Tonneson, we pride ourselves on offering expert advisory, tax, and assurance services tailored to the unique needs of our clients. Our commitment to quality service, backed by our experienced team, has been the foundation of our success. We are dedicated to maintaining our reputation for trustworthy counsel and personalized service that genuinely has our clients' best interests in mind. Thank you for being part of our story and for believing in our vision. Together, we will continue to achieve great things." #Cheersto50Years #50thAnniversary #ThisisTonneson

🎉✨ Happy New Year from all of us at Tonneson + Co! ✨🎉 As we welcome 2025, we’re filled with gratitude for the moments that have shaped us and excitement for the opportunities ahead. Wishing you a year full of success, growth, and happiness. May this new year bring you endless joy and new adventures! 🥂🌟 #HappyNewYear #CheersTo2025 #ThisisTonneson

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🎉✨ Happy New Year from all of us at Tonneson + Co! ✨🎉 As we welcome 2025, we’re filled with gratitude for the moments that have shaped us and excitement for the opportunities ahead. Wishing you a year full of success, growth, and happiness. May this new year bring you endless joy and new adventures! 🥂🌟 #HappyNewYear #CheersTo2025 #ThisisTonneson

🎉✨ Happy Kwanzaa! ✨🎉 As we continue to celebrate the rich cultural traditions of Kwanzaa during the duration of the holiday, we honor the principles of unity, self-determination, and community. May this season inspire joy, reflection, and togetherness as we embrace the values of purpose, creativity, and faith. 🌟 #HappyKwanzaa #Community #CelebrateCulture #ThisisTonneson

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🎉✨ Happy Kwanzaa! ✨🎉 As we continue to celebrate the rich cultural traditions of Kwanzaa during the duration of the holiday, we honor the principles of unity, self-determination, and community. May this season inspire joy, reflection, and togetherness as we embrace the values of purpose, creativity, and faith. 🌟 #HappyKwanzaa #Community #CelebrateCulture #ThisisTonneson

🕎✨ Happy Hanukkah! ✨🕎 May this special season bring peace, joy, and blessings to you and your loved ones. 🌟 #HappyHanukkah #FestivalOfLights #CelebrateTogether #ThisisTonneson

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🕎✨ Happy Hanukkah! ✨🕎 May this special season bring peace, joy, and blessings to you and your loved ones. 🌟 #HappyHanukkah #FestivalOfLights #CelebrateTogether #ThisisTonneson

🎄✨ Merry Christmas! ✨🎄 Wishing you a holiday season filled with love, joy, and precious moments with family and friends. May your days be merry and bright, and the new year bring you happiness and success! 🎁🌟 #MerryChristmas #HolidayCheer #SeasonOfJoy #ThisisTonneson

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🎄✨ Merry Christmas! ✨🎄 Wishing you a holiday season filled with love, joy, and precious moments with family and friends. May your days be merry and bright, and the new year bring you happiness and success! 🎁🌟 #MerryChristmas #HolidayCheer #SeasonOfJoy #ThisisTonneson

🎅❄️ Spreading Cheer, One Sweater at a Time! ❄️🎅
We had so much fun with our Ugly Sweater Contest this year, but there could only be one winner—and Orla truly sleighed it! Her festive win comes with a gift card and the chance to match a donation to a charity she chooses.

Cheers to festive fun and giving back this holiday season! 🎄✨
#HolidayFun #UglySweaterContest #ThisisTonneson

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🎅❄️ Spreading Cheer, One Sweater at a Time! ❄️🎅 We had so much fun with our Ugly Sweater Contest this year, but there could only be one winner—and Orla truly sleighed it! Her festive win comes with a gift card and the chance to match a donation to a charity she chooses. Cheers to festive fun and giving back this holiday season! 🎄✨ #HolidayFun #UglySweaterContest #ThisisTonneson

Lifelong relationships

For us it’s not just about the work we do; it’s about the people we work with. The genuine care and support we have for each other extend beyond the workplace, creating lifelong relationships and unforgettable memories with genuinely kind people. The relationships I’ve formed here are invaluable.

— Ann Jarrett-Johnson | Firm Accountant

Flexibility

The flexibility provided by Tonneson has been a game-changer for me. Whether it’s flexible hours, remote work options, or accommodating personal commitments, the company’s willingness to adapt and support my needs has made it easier to manage both my professional and personal responsibilities.

— Kyle Martin | Audit Manager

Building strong relationships

Working at Tonneson has taught me the incredible power of teamwork and the value of building strong relationships. The constant encouragement and support I receive from my colleagues fuel my motivation and make work a truly enjoyable experience.

— Jacklynn Larson | Tax Associate

Supportive and inclusive culture

At Tonneson, I have experienced a supportive and inclusive culture that values the contributions and well-being of its employees. This creates a sense of belonging and motivates me to give and be my best every day. 

— Jadie Phan | Tax Senior Associate

Join Our Team

Join Our team! Browse our current positions.

See Our Open Positions