Dennis M. Lanphier, P.C.

Dennis M. Lanphier, P.C. (DML PC) is the independent solo law practice of Dennis M. Lanphier, who holds a rare and powerful combination of professional credentials: he is a licensed CPA, a practicing attorney, and holds an LL.M. (Master of Laws) in Taxation. This combination of qualifications means that Dennis does not merely understand tax law in the abstract -- he lives it from both the accounting and legal sides every day. DML PC shares office space with Lanphier LLP in Denver, Colorado, allowing the two firms to collaborate seamlessly on matters that span accounting, tax, and law.

The advantage of working with a professional who is both a CPA and an attorney cannot be overstated. Many tax disputes, business structuring decisions, and transactional matters sit at the intersection of accounting and law. When these disciplines are handled by separate professionals who must coordinate across firm boundaries, things can fall through the cracks, advice can conflict, and the client ends up paying twice for communication that should happen naturally. With Dennis, that intersection is a single conversation.

Areas of Practice

Tax Consulting and Controversy

Dennis provides sophisticated tax consulting services to individuals and businesses throughout the Denver metro area and beyond. His legal training and advanced tax degree allow him to tackle issues that go beyond traditional CPA advisory work -- including complex tax opinion letters, tax-motivated transactions, and positions that require a deep understanding of both statutory authority and case law. When disputes arise with the IRS or Colorado Department of Revenue, Dennis represents clients through every stage of the process, from audit and administrative appeals to Tax Court and beyond.

Business Law

DML PC advises Denver-area business owners on entity formation, governance, contracts, commercial transactions, and regulatory compliance. Dennis's accounting background gives him an unusual ability to evaluate business decisions through a financial lens, ensuring that legal structures and agreements are optimized not just for legal protection but for tax efficiency and operational effectiveness.

Litigation

When negotiation and administrative remedies are exhausted, Dennis is prepared to litigate. He represents clients in US Tax Court, US District Court, Colorado state courts, and appellate proceedings. His litigation practice focuses on tax disputes, business and partnership disagreements, contract enforcement, and matters where financial expertise is central to the case. Having a litigator who can read financial statements and tax returns as fluently as legal briefs is a meaningful advantage in these proceedings.

Credentials and Background

• Juris Doctor (J.D.)
• Master of Laws (LL.M.) in Taxation
• Certified Public Accountant (CPA)
• Admitted to practice before the US Tax Court
• Licensed attorney in Colorado
• Based in Denver, Colorado

Dennis's unique qualifications make him one of a very small number of professionals in Colorado who can advise on the tax, accounting, and legal dimensions of a problem simultaneously. Whether you are facing an IRS audit, structuring a new business venture, negotiating a complex transaction, or preparing for litigation, DML PC brings a depth of expertise that is exceptionally difficult to find elsewhere.

To learn more or to schedule a consultation, visit denvertaxcounsel.com or contact the Denver office at (720) 961-0310.