Mon-Thurs 8AM-5PM , Fri 8AM-2PM  |  605-342-5630  |  810 Quincy Street Rapid City, SD 57701


For over 80 years Ketel Thorstenson, LLP has been providing public accounting services to the Black Hills region. Find your future at Ketel Thorstenson, LLP where a career provides an opportunity to work with experts in the public accounting field and growth opportunities to CPAs, accountants, bookkeepers, and administrative staff. Come define your future at the largest firm in the Black Hills.



The firm offers more than just a competitive salary. We ensure it’s worth your time and talent by offering a 401k retirement plan, life insurance, employee referral program, and tax season incentives. Don’t forget the benefits package that includes medical, dental, vision, flexible spending account plans, and discounted membership at the YMCA.


Whether you need a day off to hike in the hills, are recovering from an injury, or are a new parent, we’ve got you covered with PTO, extended illness leave, conditional leave, parental leave, and flexible work schedules. Don’t forget the eight paid holidays because everyone needs time with family and friends in order to create lasting memories.


We value your knowledge and continued education. If you plan on taking the CPA exam we’ll help pay for it, give you a nice bonus & raise, and help you maintain it through various continuing education opportunities. Don’t forget those advancement opportunities and maybe one day partnership.


Whether it’s the after-hours happy hours, annual golf outing, family picnic, pumpkin carving contest, holiday party, annual open house, or end of tax season party, you can be assured that we like to have fun.


We believe in making an ongoing effort to contribute our time and money to Rapid City and the greater Black Hills community. Whether it’s the arts, education, special interest groups, or non-profits, the firm encourages you to get involved.

Core Values



Provide exceptional and accurate professional services delivering premium value and exceeding expectations

Innovation happens through teamwork and shared goals



Offer knowledgeable teams dedicated to delivering strategic solutions to ensure our people, our clients, and our communities reach their fullest potential

Achive excellence through teamwork.



Foster our strong foundation of being a dependable, honest, and accountable resource generating continued trust

Being our true selves promotes trust and creates new friendships



Nurture a supportive environment promoting genuine interest, giving back, growth, and success

Making time to connect and discuss varied thoughts and ideas



Encourage diverse thoughts and opinions through collaboration while delivering a variety of services and creating strategic relationships


  • Tanya Shepersky

    Tanya Shepersky

    Coordinator, HR and Marketing Departments
    “Ketel Thorstenson’s commitment to their staff, clients, community, and fun puts them ahead of the game in the accounting industry for our region. I’m happy to be a part of a firm that encourages and promotes community involvement, staff development, flexibility, and great benefits!”

  • Carrie Christensen, CPA

    Carrie Christensen, CPA

    Manager, Tax Department
    “I first discovered KT online. In contemplating relocating to Rapid City, I began researching public accounting firms in the area. Through my research, I quickly realized that KT is the premier accounting firm in the area. So basically, I came to KT because I wanted the best! KT has a long-standing commitment to quality, ingenuity, and also, fun! At KT, I have the opportunity to learn from some of the best minds in the profession. KT provides me with the challenges and resources I need to grow in my career. I am excited to come to work each morning!”

  • Austin Eichacker, CPA

    Austin Eichacker, CPA

    Manager, Audit Department
    “KT is a great place to work. It has a fun, fast-paced work environment that lets you work with a variety of different clients. I appreciate how KT has made a commitment to develop its employees and give back to the community.”

  • Joei Tieman, CPA

    Joei Tieman, CPA

    Senior Associate, Tax Department
    “I switched careers later in life as I was looking for a new adventure and a way to advance my career. I wanted to be challenged, have opportunities to grow, expand my knowledge, and be able to work with people. I have never looked back after accepting a position with Ketel Thorstenson and don’t regret my decision one bit! The staff and clients are great!”

  • Kyle Kopren, CPA

    Kyle Kopren, CPA

    Manager, Audit Department
    “Ketel Thorstenson, LLP is an incredible place to work because of the culture created by the coworkers. I see on a daily basis how hard work and dedication mixed with a little fun can create a culture that is pleasing to any employee.”

  • Jeff Yennie, CPA

    Jeff Yennie, CPA

    Manager, Audit Department
    “KT provides the opportunity to work in a variety of industries, from non-profit organizations to large manufacturing and highly technical clients. Rapid City also offers the convenience of a larger city, but is still a small to mid-size town, which is appealing for those wanting to live in a rural area.”

    online payments

    If you would like to pay an invoice online with a credit card click on the Pay Now button.  Pay_Now_button

    You also have the option to pay your invoice electronically via ACH (bank to bank transfer) at no cost to you by completing the ACH form and returning it to your accountant.


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