Big Firm Expertise.
Small Firm Heart.

Sophisticated tax, accounting, and advisory solutions for businesses and families in the heart of Denver.

Book a Consultation (720) 961-0310
Est. 2009 7 Continents Broncos Partner
Dennis and Brittany Lanphier, founding partners of Lanphier LLP

Full-Service CPA Firm

Licensed Attorney on Staff

International Tax Specialists

Denver Broncos Partner

How We Serve You

A full-service CPA firm with the expertise to handle every aspect of your financial life.

Tax Services

Strategic tax planning, preparation, consulting, and IRS controversy resolution for businesses and individuals.

  • Tax Preparation
  • Tax Consulting
  • Tax Controversy
  • IRS Representation
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Accounting

Comprehensive accounting support from bookkeeping to financial statements and forensic accounting.

  • Outsourced Bookkeeping
  • Financial Statements
  • QuickBooks Training
  • Forensic Accounting
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Advisory Services

Nationally-recognized tax planning and strategic advisory services for businesses and individuals.

  • Business Best Practices
  • Individual Tax Fundamentals
  • Strategic Planning
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Legal Services

Tax controversy, business law, and litigation through Dennis M. Lanphier, P.C.

  • Tax Court Petitions
  • Business Law
  • Contract Review
  • Entity Setup
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International Tax Specialists

One of the only small CPA firms in Colorado specializing in international taxation. We have filed US tax returns on every continent — including Antarctica.

Explore International Tax Services

Big Firm Expertise...
Small Firm Relationships

Established in 2009, Lanphier LLP is a full-service CPA firm in Denver, CO. Originally started as a husband-and-wife team with Big 4 experience at Deloitte, we have grown into a highly specialized and respected firm in the Denver Metro area and beyond.

Our small-business roots enable us to connect with our clients on a more personal level in providing tax, accounting, and advisory services to both businesses and individuals. Our goal is for each client to feel like our only client.

We are nationally recognized for our thought leadership and innovative processes in tax advisory services. We are a small firm with a global reach — we have filed US tax returns for businesses and individuals on every continent, including Antarctica.

Kids coloring basket in the Lanphier LLP reception area

Need to bring the kids along? We have you covered. Family-friendly from day one.

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The Lanphier LLP team on a Denver rooftop terrace with mountain views

"The quality and expertise of their work is top-notch, and most importantly, they are extremely responsive to our needs."

— Don Golden, President, Precision Sample LLC
Lanphier LLP has, by far, the best accountants I have worked with as a business owner. The quality and expertise of their work is top-notch, and most importantly, they are extremely responsive to our needs.

— Don Golden

President, Precision Sample LLC

Ready to Take Control of Your Tax Strategy?

Whether you need strategic tax planning, accounting support, or help navigating an IRS dispute, we are here to help. Schedule a consultation and discover the Lanphier LLP difference.

Book a Consultation Call (720) 961-0310

Get in Touch

Ready to take control of your tax and financial strategy? We offer both in-person and Zoom consultations.

Office

2000 S. Colorado Blvd
Tower 1, Suite 10800
Denver, CO 80222

Free 2-hour guest parking in garage

Hours

Tuesday - Thursday: 9am - 6pm

Monday & Friday: Remote / By appointment

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