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The team at Colleen Black & Co is committed to provide exceptional service to our clients. We are dedicated to three underlying business principles: Professionalism, Responsiveness & Quality.


  • Colleen Black & Co CPAs is a leading firm located in south-central Montana. We help clients from all over the WORLD! Given the miracle of technology and our completely secure web portal, we are able to reach a very wide client-base.
  • Each client receives a professional and strategic approach to their unique case. We are able to help solve problems quickly and painlessly because of our extensive expertise in a wide variety of tax, accounting and small business issues.
  • The firm is just large enough to be able to offer a full team approach to every plan. But, at the same time, just small enough to know that YOU are important.  We are committed to taking care of all of our clients.
  • We are committed to privacy.
  • We are committed to your security. Our clients are our first priority.
  • We have not forgotten the value of conducting business on a handshake.
  • Our high standards and specialized and highly educated staff spell the difference between our impeccable approach and other firms.
  • We utilize the team approach. When you walk through the proverbial door, you get not only the experience and expertise of the team member sitting across the desk from you, but from our entire team of no less than 20 professionals working together to serve you.  


  • We are responsive. Companies and individuals who choose our firm are provided with competent advice, quick turnaround, and friendly people.
  • Sometimes it's just good to bounce an idea off of an unbiased party. We do that. Let's talk!
  • To see a listing of our services, please take a moment and look at our /~cblacktax/services.php.


  • Colleen Black & Co is known for the quality of its service. Our reputation reflects the high standards we demand of ourselves.  Through hard work, we have earned the respect of business and financial communities by earning Billings Best Accounting Firm four years in a row.
  • Our primary goal as a trusted advisor is to be available to provide insightful advice to enable our clients to make informed financial decisions. We do not accept anything less from ourselves and this is what we deliver to you.
  • Colleen realizes that in order to keep up with technology and the fast-paced world, it takes an unrelenting commitment to educating her staff.  It is extremely important to stay on top of and improve our technical expertise, know and keep up with the ever-changing tax laws, and be up to date with financial knowledge in order to service our clients. We work to blaze the trail for all tax and accounting practices.
  • We will answer all of your questions, as they impact both your tax and financial situations. We welcome you to contact us anytime.

General Info
Who we are
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In The Community
Community involvement at Colleen Black & Company plays an integral role in our office activities.
We take care of your books for you, so you can get back to the job of running your business and generating profits.
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We offer payroll solutions that meet your business's needs and enable you to spend time doing what you do best--running your company.
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We offer a variety of services to help make sure that you are taking full advantage of Quickbooks' many features.
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We're here to help you resolve your tax problems and put an end to the misery that the IRS can put you through.
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We offer one-on-one guidance and a comprehensive financial plan that helps manage risk, improve performance, and ensure the growth and longevity of your wealth.
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© Colleen Black & Co PC CPA 2021