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Your Trusted Legal Partner in Longmont, CO
The Van Dusen Law Firm is dedicated to delivering exceptional legal services with a focus on integrity, advocacy, and client-centered support. Our founder, William R. Van Dusen, Jr., brings over 25 years of experience in both public and private legal sectors, including roles as Assistant Attorney General, Deputy District Attorney, and Assistant City Attorney. With a Juris Doctor and a Master of Laws in Taxation from the University of Denver Sturm College of Law, we specialize in tax planning, estate planning, business formation, and audit representation. Our teams diverse expertise ensures comprehensive legal solutions for individuals and businesses facing complex challenges.

We prioritize understanding each clients unique needs, offering tailored strategies to achieve favorable outcomes in tax disputes, probate matters, contract negotiations, and more. As a small business owner himself, Mr. Van Dusen provides practical insights for business clients seeking optimal organizational structures. Our commitment to excellence extends to teaching and publishing on legal ethics and privacy rights, reinforcing our authority in the field. Located in Longmont, Colorado, we serve clients across the state with personalized attention and a track record of success in IRS audits, estate planning, and business law.
Services
Tax Planning Estate Planning Business Formation Tax Audits Contracts Negotiations
Highlights and features
  • We offer over 25 years of legal experience in tax and business law.
  • Our founder holds a Master of Laws in Taxation from the University of Denver.
  • We provide comprehensive representation in IRS audits and tax court.
  • Our team combines public sector expertise with private client focus.
  • Free initial consultation to address your legal needs.
Services
Tax Planning
Van Dusen Law Firm provides strategic tax planning to minimize liabilities for individuals and businesses. Our services include analyzing financial situations, structuring legal tax-saving methods, and ensuring compliance with federal and state regulations. With expertise in IRS processes, we help clients reduce long-term tax burdens while maintaining legal integrity.
Estate Planning
We offer compassionate estate planning tailored to individual and family needs. Services include drafting wills, establishing trusts, and advising on end-of-life decisions. Our firm also guides clients through probate processes in Colorado, ensuring assets are distributed according to their wishes while minimizing legal complications for heirs.
Business Formation
Van Dusen Law Firm assists businesses in selecting optimal legal structures, including LLCs, corporations, and partnerships. We provide strategic advice on minimizing tax liabilities, drafting organizational documents, and ensuring compliance with state and federal regulations. Our goal is to help clients establish sustainable business frameworks aligned with their growth objectives.
Tax Audits
Our firm represents clients in IRS and state tax audits, negotiating installment agreements, offers in compromise, and resolving liens. With deep knowledge of audit procedures, we work to achieve favorable outcomes through documentation, legal arguments, and appeals when necessary, protecting clients from excessive penalties.
Contracts Negotiations
We draft, review, and negotiate contracts for businesses, including employment agreements, leases, and purchase contracts. Our services ensure legal clarity and protection in business transactions, with a focus on minimizing risks and aligning agreements with clients operational and financial goals.
People
William R. Van Dusen, Jr.
Founder & Attorney
William R. Van Dusen, Jr., holds a Juris Doctor and a Master of Laws in Taxation. With over 25 years of experience, he has served as Assistant Attorney General and Deputy District Attorney in Colorado. He specializes in tax law, estate planning, and business law, representing clients in IRS audits and tax court.
Questions
What legal services does Van Dusen Law Firm offer?
We specialize in tax planning, estate planning, business formation, audit representation, and contract negotiations for individuals and businesses.
How experienced is Van Dusen Law Firm in tax law?
Our founder has over 25 years of experience, including defending 500+ clients in IRS and state tax disputes.
Do you offer free consultations?
Yes, we provide a free initial consultation to discuss your legal needs and potential strategies.
Can you help with IRS audit representation?
Yes, we offer vigorous defense in IRS audits, including negotiating agreements and litigating in tax court.
What areas do you serve?
We primarily serve Longmont, Cuchara, and throughout Colorado with personalized legal support.
How does your firm approach estate planning?
We create tailored plans focusing on your family’s current and future needs, including wills, trusts, and probate guidance.