Welcome to Duncan & Company, LLC!


Duncan & Company, LLC is a CPA and business advisory firm located in downtown Parker, Colorado. With over 25 years of experience, we proudly offer monthly QuickBooks Online (QBO) accounting and bookkeeping, payroll and sales tax, annual and quarterly tax return preparation & planning, and audit, review and compilation serivces. Our business tax clients include sole proprietors, LLCs, corporations, S-corps, partnerships, estates & trusts, gift tax returns, and nonprofit organizations (NPOs).

Our philosophy: “Delivering painless and timely accounting and tax services with prompt, clear communication.” We use a secure cloud portal, advanced tax software, remote QuickBooks Online bookkeeping, and other AI technologies to provide an easy and convenient solution for your accounting and tax needs. Clients stay informed via instant messaging through our client portal, as well as in-person, phone, or virtual meetings.

Our services include:

  • Individual and business income tax return and planning (Forms 1040, 1065, 1120/1120-S, 990).
  • QuickBooks Online (QBO) bookkeeping services, payroll, and sales tax reporting with fixed monthly fees.
  • Independent accounting services including audits, reviews, compilations, and other business advisory services.
  • QuickBooks Online troubleshooting, support, and training services.
  • IRS notice resolution, business and NPO formation and registration, and other services!

We look forward to serving you!

Duncan & Company, LLC
19204 E. Mainstreet
Parker, CO 80138
(303) 386-5200
info@duncancocpa.com