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Your Trusted Legal Partner in Longmont, CO
The Van Dusen Law Firm is dedicated to delivering exceptional legal services grounded in integrity, advocacy, and personalized attention. With over 25 years of experience in both public and private sectors, our founder, William R. Van Dusen Jr., combines a Juris Doctor and a Master of Laws in Taxation to address complex legal challenges. Our practice spans tax planning, estate planning, business formation, and contract negotiations, supported by a team committed to comprehensive solutions. Bills background as a former Deputy District Attorney, Assistant City Attorney, and Assistant Attorney General informs his strategic approach to client representation. We prioritize understanding each clients unique needs, offering tailored advice to navigate tax disputes, probate matters, and business structuring.

Our firms commitment to excellence extends to educating clients on legal processes and advocating fiercely in every case. Located in Longmont and Cuchara, Colorado, we serve individuals and businesses with local insight and national expertise. The firms reputation for resolving over 500 IRS and state tax cases underscores our proficiency in audit defense and tax litigation. By integrating deep legal knowledge with practical problem-solving, we empower clients to achieve favorable outcomes. Our dedication to community involvement and ethical practice further distinguishes us as a trusted legal partner in Colorado.
Services
Tax Planning Estate Planning Business Formation Contracts Audit Representation
Highlights and features
  • We offer 25+ years of experience in tax and business law with a proven track record in audit defense.
  • Our founder holds a Master of Laws in Taxation from the University of Denver Sturm College of Law.
  • We provide comprehensive legal solutions, including tax, estate planning, and business formation, under one roof.
  • Our team includes seasoned professionals with backgrounds in public service and complex litigation.
  • We offer a free initial consultation to discuss your unique legal needs.
Services
Tax Planning
Van Dusen Law Firm provides strategic tax planning to minimize liabilities while ensuring compliance with federal and state regulations. Our services include structuring deductions, credits, and entity formations to optimize financial outcomes. With a focus on long-term savings, we counsel individuals and businesses on tax-efficient strategies tailored to their unique circumstances.
Estate Planning
We create customized estate plans, including wills, trusts, and advance directives, to protect assets and ensure client wishes are honored. Our approach balances legal precision with compassionate guidance, addressing both small and large estates. Probate representation ensures smooth administration of estates in Colorado courts.
Business Formation
The firm assists in structuring businesses as LLCs, corporations, or partnerships to maximize profitability and minimize tax exposure. We provide ongoing counsel on compliance, contracts, and operational strategies. Our experience as small business owners informs practical, growth-oriented solutions for clients.
Contracts
We draft, review, and negotiate contracts for employment, partnerships, leases, and business transactions. Our goal is to ensure clarity, enforceability, and alignment with client objectives. Services include risk assessment and dispute resolution clauses to safeguard business interests.
Audit Representation
Van Dusen Law Firm defends clients during IRS and state tax audits, negotiating settlements and reducing penalties. We handle installment agreements, offers in compromise, and appeals. With over 500 cases resolved, our expertise minimizes financial exposure and stress during audit proceedings.
People
William R. Van Dusen Jr.
Attorney
William R. Van Dusen Jr. is a Colorado-based attorney with 25+ years of experience in tax law, criminal matters, and litigation. He holds a Juris Doctor and a Master of Laws in Taxation from the University of Denver. Former roles include Deputy District Attorney and Assistant City Attorney. He teaches professional ethics and has authored publications on FERPA compliance.
Questions
What areas of law does Van Dusen Law Firm specialize in?
We specialize in tax planning and resolution, estate planning, business formation, contract negotiations, and audit representation.
How experienced is the Van Dusen Law Firm team?
Our founder has over 25 years of legal experience, including roles as Deputy District Attorney and Assistant City Attorney.
Does the firm offer a free initial consultation?
Yes, we provide a free initial consultation to discuss your legal needs and potential strategies.
Can the firm handle complex tax audits?
Yes, we represent clients in IRS and state tax audits, with a track record of over 500 resolved cases.
What estate planning services are available?
We offer wills, trusts, probate guidance, and end-of-life planning tailored to individual and family needs.
Do you serve clients outside Longmont?
Yes, we serve clients in Cuchara, Colorado, and surrounding areas with personalized legal support.