Run a free full auditThe Van Dusen Law Firm LLC is a Tax Attorney in Longmont, CO, located at 717 5th Ave. The firm provides legal representation in tax planning, controversy, and resolution, tax audits, estate planning, probate matters, business planning and formation, and contracts and negotiations. It holds a 4.40 rating based on customer reviews.
Founder William R. Van Dusen, Jr. earned a Juris Doctor and an advanced Master’s Degree in Law in Taxation from the University of Denver Sturm College of Law. He has over 25 years of experience in the public and private sectors, including service as an Assistant Attorney General, Deputy District Attorney, and Assistant City Attorney in Colorado. His background covers tax law, criminal matters, litigation, municipal law, and contract and legislation drafting. He is a member in good standing of the Colorado Bar, the United States Tax Court, and the United States District Court for the District of Colorado.
The firm represents clients in IRS examinations, appeals, and the United States Tax Court, having successfully defended over 500 clients on IRS and state tax issues. Services include negotiating installment agreements, offers in compromise, and handling liens and levies. The firm offers a free initial consultation and provides compassionate estate planning for individuals and families, counseling on wills, trusts, and tools for financial, medical, and end-of-life decisions. It also assists with business restructuring and organizational structures, including professional organizations, limited liability companies, and for-profit and not-for-profit corporations. The firm operates offices in Longmont at 717 5th Avenue, Colorado 80501, and in Cuchara at 579 Community Road, Colorado 81055.
The firm is a proud member of The Longmont Chamber of Commerce. Bill Van Dusen has taught professional ethics, including business ethics and continuing education courses for attorneys, and has written on FERPA issues. He is a small business owner who helps clients maximize profits and minimize expenses.
With deep roots in Colorado and extensive experience in tax law and litigation, The Van Dusen Law Firm LLC delivers specialized legal expertise to residents and businesses in Longmont.
The Van Dusen Law Firm LLC is situated on 5th Avenue in Longmont, Colorado, just a short distance from the Longmont Theatre Company and Main Street. It is also near notable local landmarks such as The Thinker public artwork and the Longmont Carnegie Library.
The firm holds a Performance score of 80 out of 100, as measured by SEOScanPRO. This rating reflects how quickly the website loads, which helps keep visitors on the page and serves as a factor search engines use in ranking the business.
BizScoreAI scanned the website vandusenlawfirm.com on June 25, 2026. The Van Dusen Law Firm LLC has a BizScore of 40 out of 100. The website audit behind the SEO score ran on October 28, 2026.
AI visibility scan by category: AI Discovery 10 of 25 points, Structured Data 0 of 25 points, Content Readiness 4 of 30 points, AI Trust Signals 4 of 20 points.
Website audit sub-scores (out of 100): On-Page 73, Technical 60, Performance 70, Content 25.
Strengths: 2 checks passed. AI Crawler Access, AI Content Blocking.
Areas to improve: 9 checks. llms.txt (failed), Structured Data (failed), Q&A Content (failed), Content Too Thin (failed), Weak Heading Structure (warning), Meta Description (warning), About/Team Page (warning), XML Sitemap (warning), Author Signals (warning).
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