About Us


We began our journey October 1, 2011 in an apartment in Duluth. The first two years, we provided income tax preparation. In January 2013, we added Quick-Books and sales tax services. We quickly realized the small businesses in the area were under-serviced and hired three part-time bookkeepers in May 2013.

In October 2013, we opened our current office location at 102 E. Central Entrance in preparation for the 2013 filing season. We continue to add services and locations as we grow.


Andy Grengs, owner of TCG Accounting, enjoys meeting new people, learning about new businesses and finding ways to assist others with meeting their dreams and goals. Since October 2011, Andy has been providing income tax return preparation, accounting, and QuickBooks consulting services to a variety of clients. He is a Tax Return Preparer and QuickBooks ProAdvisor. Andy volunteers his time at the Northeast Regional Correctional Center and the St. Louis County Jail preparing income taxes. He enjoys helping out the families of those who are incarcerated. Andy actively participates in the Duluth Chamber of Commerce, Business Network International Zenith City Business Builders as the chapter President, Twin Ports Connex Young Entrepreneurs Group, Toastmasters and continuing education to develop his skills as a leader in the business sector. He recently joined the Hermantown Chamber and the Arrowhead Builders Association to further assist those in need of accounting services. In his pursuit of becoming a serial entrepreneur, he is also a partner in three other businesses with many other ideas in the works. His dream is to someday be an angel investor like those seen on Shark Tank.



We believe in educating our clients to help them make better financial decisions throughout the year. We don't just "fill in the blanks." We want our clients to understand what we are doing and why. We work diligently to make sure clients know about all available tax credits and deductions.


Proactive Communication

We believe in communicating the latest information to our clients. Whether it's an increase in minimum wage, a new or changed tax credit or it is time to file your property tax return, we reach out to inform you. We send out monthly newsletters, post on multiple social media platforms, blog, and email breaking news updates.



We believe a key aspect to building a successful business is networking. We network not only for our benefit, but to connect our clients with others to proactively assist in their growth. We are actively involved in the Duluth Area Chamber of Commerce, Hermantown Chamber of Commerce, Superior Chamber of Commerce, Cloquet Chamber of Commerce, Business Network International, Arrowhead Builders Association, and make an appearance at many others.



We believe a team approach is important. It helps to decrease response time to questions. We know it can be frustrating if you cannot get in touch with your accountant, so why work with only one person? Every client at TCG Accounting is assigned to a team with a lead accountant in charge of communication.



Our motto says it all. At TCG we say - “Your Success Is Our Priority” - and we mean it. We do everything we can to ensure the success of our clients, whether it is training them on new software, providing bookkeeping, payroll, and tax services, or connecting them with other business owners and networking events. We love watching our clients succeed!

Our Vision

To become a Top 100 accounting firm by 2024

Our Motto

Your Success is Our Priority

Meet Our Team

William (Bill) Benson, Jr.

William (Bill) Benson, Jr, is a certified public accountant who has been serving the Twin Ports and surrounding areas for over 35 years. His goal is to provide clients with the highest level of professional services with integrity and confidentiality. Outside of work, Bill is an avid reader who enjoys riding his Harley, traveling, and spending time with his grandchildren.

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Tammy Courrege

Tammy Courrege has joined TCG Accounting as a bookkeeping / payroll specialist. She graduated from Lake Superior College with an accounting AAS and microcomputer specialist degree. She has 15+ years of experience doing accounting and payroll for a variety of businesses. Outside of work she enjoys being with family and friends.

Bonita Martin

Bonita joined TCG Accounting in December 2017. She earned her Bachelor’s degrees from the University of Wisconsin – Superior. Her first Bachelor’s degree included majors in writing and biology and the second, most recent degree was in accounting. She is a certified analyst for milk and water in Wisconsin and works part time at the Douglas County Health Department laboratory. Outside of work, Bonita spends her time with her family, and fixing up her homestead on the Middle River, the core component being a squared log cabin built in the late 1800’s. She loves to write and enjoys cooking, sewing, knitting and other crafts.