About Us

About Us


COS was founded in 2019 by Zach Bassett and Mason Warr. They saw a gap in the tax and accounting world for independent contractors and LLCs. So they created a full service accounting firm to supplement all the financial needs of a company.


We strive to be your one stop shop for all the financial needs of your company including taxes, bookkeeping, insurance, payroll, consulting and anything else you need. We have a team of experts that will customize your taxes. We specialize in tax filing for 1099 contractors and help small businesses claim the ERC tax credit.


Our main goal is to help you become successful. We want to help our clients stop worrying about the finances involved in running a business. We strive to be a “partner” in making your success a reality.


We Work For Your Success


Co-Founder & CFO
Zachary Bassett (MTax)

Zach is the Co-Founder, CFO, and Senior Tax Manager of COS Accounting & Tax. With more than ten years of experience specializing in door to door sales, direct sales, and small business taxation, Zach is a vital member of the COS family. Zach's goal of helping more than 10,000 clients become multi millionaires within 20 years; using his "Compounding Net Worth" strategy is inspiring & contagious. Zach coaches over 300 of the top sales rep's, managers, and owners in the D2D industry. He also manages the tax preparation for more than 2,500 clients.


Co-Founder & CEO
Mason Warr

Over the course of Mason's career, he worked his way up the ladder at multiple companies. He became a master of sales and managing people, & was recruited to be the CEO and Co-Founder of COS Accounting & Tax. Mason's management skills are sought after by many, and in 2020 those skills contributed heavily to a 1,000% growth by COS. He currently coaches managers, CEO's, and small business owners on how to replicate similar growth and employee culture. Employees of COS truly enjoy working under Mason, enough even, to give him a nickname, "Mom".


Internally we focus on providing each other solutions rather than bringing each other problems.We are looking for people who not only work hard but want to better themselves and those around them. At COS we are a family and we strive to make everyone feel at home. We need people who are innovative and take initiative. We want to empower you to find solutions to problems and “earn your stripes.” If that is you, take a look at our job openings on our career page. 

We would love to meet you! 

 “You miss 100% of the shots you don’t take” 

Wayne Gretzky 

-Michael Scott



“COS is an amazing company to work for! If you show the initiative to take on new things you will get opportunities to move up in the company. They really show they care about their clients as well as employees. I’ve never worked somewhere where I feel so valued as I do at COS!”


Human Resource Manager

“COS appreciates the skills you bring to the table and welcomes innovation and new ideas.”








My manager actually cares about me and makes us feel valued in the company. Management is approachable and caring. We do stuff like company lunches and ice cream socials every week. The environment is relaxed and I’ve actually learned a lot about taxes not knowing anything about them before.”


ERC administrator

“Working for COS has been a blessing to me and my family. The flexibility of work and family is well balanced. I enjoy going to work and working with such amazing people.” 




Payroll specialist