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When Accuracy Counts

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Business Services

We take care of your business for you, so you can get back to the job of running your business. Learn more

Tax Services

We are committed to accuracy. You can trust that your tax returns will be correct. Learn more

Accounting Software & QuickBooks

We have extensive experience working with a wide range of accounting software. Learn more

Industry Specialties

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Welcome to Oldenburg Accountants & Advisors!

Oldenburg Accountants & Advisors is a boutique CPA firm serving small and medium-sized business owners and individuals with high income and complex tax situations. We are located in Lake County Illinois, and have been serving the needs of clients for many years, both locally and out of state. Our Services

Today's taxes are complicated.

Owner and founder Susan Oldenburg started the firm in 1991 and continues to serve her clients for their accounting, tax and advisory business needs. She is directly involved with and regularly meets with business owners. As a CPA, she has a comprehensive knowledge of tax and accounting rules, and as a business owner, she understands what it takes to run a successful business. About Us

Our promise to you:

  • To always be reachable and highly responsive
  • To welcome your questions and to not charge for your phone calls
  • To deliver reports and tax returns on time with accuracy and completeness
  • To use our professional expertise to help lower your tax bill
  • To guarantee your complete satisfaction with our work
Member of AICPA
Member of Illinois Society of CPAs

Recent News

Testimonials

Oldenburg Accountants & Advisors assisted our small business with modernizing our bookkeeping procedures. Sue worked diligently to help us understand our finances and keep accurate records. We needed to do detailed financial projections for a possible business expansion this year. Sue's thoroughness and attention to detail put us in an excellent position and provided better reporting.

Our previous accountant was not engaged in our day-to-day business. Sue is the complete opposite! Sue ensures that we understand our finances and verifies that our records are accurate. Overall, the business is in a better financial position because we understand it better.

We have found that Sue runs a very tight, well-managed business. She and her staff have responded to our needs in a very professional and timely manner. Sue will dig into the business details and go back as far as necessary to have a good understanding of how your business operates. If you are seeking an accounting firm that knows the rules and will be a great business partner, I highly recommend Oldenburg.

I just wanted to take the opportunity to comment on the matter of the case we both worked on. I want to compliment you on the work you did on this case. You truly did a wonderful job of representing your clients. This was an extremely difficult case and I congratulate you on the work that you and your staff performed. In looking at the history of this case, I am convinced that you probably saved these clients from total disaster. Probably only you and I will really understand the tireless effort that you performed to bring this case to a resolution. (Tax Attorney)

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