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Our Services

Welcome to Duncan & Company, LLC!


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With over 25 years of experience providing audit, accounting, and tax services for businesses of all sizes and industries, we specialize in QuickBooks Online (QBO) small business bookkeeping, GAAP accounting services, and tax preparation and planning services including:

  • Customizable small business bookkeeping
  • Accounting and review services for nonpublic companies 
  • Income tax return preparation and filing for individuals and businesses including:
    • Small business LLC's,
    • Partnerships,
    • Corporations and S-Corporations,
    • Nonprofit Organizations and
    • Estates and Trusts
  • Contract accounting services

We also provide the following additional services:

  • Set up and customization of QBO accounting software, including advising on proper program to use
  • Entering and reconciling transactions, including catch-up bookkeeping, so your books are accurate
  • Fixing issues with accounts and transactions
  • Contract accounting services (remote and on-site)
  • Help applying for Employer Identification Number (EIN) and registering and filing with Colorado Secretary of State
  • Sales tax filing and payroll services
  • Applying for IRC 501(c)(3) status for nonprofit organizations

Our monthly small business bookkeeping services are fixed-fee monthly billing to help you budget your accounting and bookkeeping costs!

If you are behind in filing your tax returns or filed an extension for 2023, we can help! We also provide year-end tax planning services to help you save money on taxes and avoid penalties and interest! Please give us a call today!

Please browse our website for useful information, financial calculators for personal, business and investing, and links to websites such as IRS, US Small Business, and other sites! 

Fill out our ServicePLUS page to contact us for a free consultation! We look forward to serving you!

Duncan & Company, LLC
(303) 386-5200

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Get the tax and accounting expertise you need.

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Hear From Our Clients

Bruce Phipps

I am self-employed and my tax situation has become more complex over the years. Duncan & Co (specifically Michael) has cleared through the maze of tax code and the clutter of disinformation to make things much simpler and less stressful.

The client interface is simple: I upload my documents, he asks relevant questions and does the work. His fees are reasonable and the results speak for themselves.

I whole-heartedly recommend Michael Duncan & Co.

William Grimsley

Professional service from begining to end. I will continue to use Michael and would highly recommend his services.

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Where to Find Us

Here are the best ways to contact us.

303-386-5200 Fax: 720-595-5004

17128 E. Cedar Gulch Dr., Parker, CO 80134

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We would love to hear from you!

303-386-5200 Fax: 720-595-5004

Get clarity on your tax and accounting situation