Depend on Our People.

You want partners who understand your business and its unique needs. Partners who are proactive, experienced and knowledgeable – who understand your passion and care about your success.  At Olsen Thielen, we pride ourselves on our history of building long-lasting partnerships with our clients.  Our focus is on helping you achieve your organization’s goals. We offer a rare combination of experience, specialized skills and principles, and are committed to delivering outstanding service and value to your business.

Count on Our Advice.

Today’s business environment presents ever greater challenges and requires you to draw upon all your strategic and advisory resources to plan and execute effectively.  At Olsen Thielen, we offer the wide range of services and industry expertise that you might find in a larger firm, with the personalized attention of a smaller firm.  You can rely on our experience and dedication to help you achieve not only your goals for today, but your vision for the future.

Olsen Thielen is a full service accounting and consulting firm, and a “Top 25” firm in Minneapolis and St. Paul, Minnesota. We focus on providing top quality solutions for our clients through our traditional accounting and tax services, as well as non-traditional services like valuations, business succession planning,  employee benefits and human resources consulting, back-office cloud accounting solutions, estate, gift and financial planning, and fraud and forensic accounting.

Olsen Thielen was founded on the belief that personal attention, trust, and quality service were the key elements to helping our clients succeed.  95 years later, that commitment remains.  Our longevity and growth can be attributed to building strong relationships with our clients and continuing to earn their trust.

Learn about what makes us different

The Olsen Thielen Experience

The Olsen Thielen Advisor

Available in print or electronically, this bi-monthly newsletter provides current and timely information to clients and subscribers. Between publications important tax and industry updates are published on our Advisor Blog.

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  • Early Bird Filing Date graphic

2018 Early Bird Tax Filing Date

January 19th, 2018|0 Comments

The IRS will start accepting 2017 tax returns on January 29, 2018.  If this seems [...]

  • US Map

What is Economic Presence Nexus and How Does it Affect You?

January 17th, 2018|0 Comments

Economic Presence Nexus is a legal term that refers to the requirement for entities conducting business [...]

  • supplemental

2018 Withholding Rates Decrease for Supplemental Wages and Backup Withholding

January 15th, 2018|0 Comments

Rates for withholding on supplemental wages There is a two-tiered system for withholding income tax [...]

 A Commitment to Quality and Success

KM Telecom

Building Long-Term Partnerships Beth Tollefson is the CFO and fourth generation owner at KMTelecom in Kasson, Minnesota.  She has worked with Olsen Thielen & Co., Ltd. as long as she can [...]

JUX Law Firm

When Mark Santi, a Minneapolis-based attorney with JUX Law Firm, was approached by one of his clients who had concerns that he was potentially a victim of fraud in his business, Santi called on the fraud and forensics experts at Olsen Thielen.

Integrity Medicolegal Enterprises

Integrity’s relationship with Olsen Thielen began as a response to heightened interest from clients and prospects around the issue of data security. They wanted to take the next logical step and conduct a Service Organization Controls (SOC) audit.


Olsen Thielen has the knowledge and experience to serve a diverse client base across a wide range of industries.


Large enough to provide full service expertise, yet small enough to provide timely, personalized service.

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