Tax Preparation & Accounting for Denver, CO

Serving Denver clients from our Aurora office with secure, remote-friendly tax and bookkeeping support.

Serving Denver From Our Aurora Office

If you’re located in Denver and searching for tax preparation in Denver CO, you may be wondering whether you need a firm with a downtown office. Many of our clients live or operate businesses in Denver and work with us remotely or by appointment at our Aurora location.

Do you serve Denver if your office is in Aurora?

Yes. We regularly work with individuals and businesses throughout the Denver metro area.

Denver Tax & Accounting Services

We provide a full range of near Denver tax services, including:

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Tax Preparation Denver CO

Individual and business returns prepared and e-filed accurately and on time.

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Denver Tax Planning

Year-round planning designed to coordinate income, deductions, and business decisions before deadlines.

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Denver Bookkeeping

Monthly bookkeeping, reconciliations, and financial reporting for small businesses and self-employed professionals.

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IRS Tax Help

Support responding to IRS notices, audits, and payment arrangements.

Remote-Friendly & Secure

You don’t need to drive across town just to drop off paperwork.


Can I work with you from Denver and upload documents online?

Yes. Our secure client portal allows you to:


  • Upload tax documents securely
  • Review completed returns
  • Sign electronically
  • Pay invoices online


This means you can complete the entire process without in-person visits, unless you prefer them.

Established Since 1986—Serving the Denver Metro Area

Mark Christiansen Associates LLC has supported clients across Aurora and Denver since 1986. Our longstanding presence reflects consistent service, practical guidance, and long-term relationships.



If you’re comparing Denver tax accountant options, experience and accessibility matter. We combine metro-area reach with direct phone access and a stable local office.

Ready to Get Started?

Whether you’re an individual, retiree, small business owner, or nonprofit organization in Denver, we provide structured, reliable accounting support designed to reduce confusion and keep your finances organized.