Finding the right accounting firm in Denver can transform how your business handles everything from tax compliance to strategic financial planning. Colorado’s unique tax environment—including 66 home-rule cities with individual sales tax jurisdictions—makes working with the right firm critical for businesses of all sizes.
Whether you’re a fast-growing e-commerce brand managing multi-state sales tax compliance, a SaaS company with remote employees creating nexus across multiple states, or a local business seeking year-round tax guidance, Denver’s accounting landscape offers options ranging from Top 100 national firms to specialized boutiques with deep Colorado expertise.
Key takeaways
- Bennett Thrasher – Top 100 national firm with new Denver office, strong technology/SaaS industry focus, and comprehensive tax advisory services
- Forvis Mazars – 2026 Best of Accounting Gold Award winner with robust state and local tax (SALT) capabilities and international tax expertise
- TaxOps LLC – Big Four veteran leadership specializing in multi-state taxation and tax function optimization for complex businesses
- Dark Horse CPAs – Advisory-first approach with deep Colorado tax expertise and year-round strategic planning
- SDO CPA – Virtual CPA model ideal for FinTech startups and remote-first companies with multi-state employees
- Clarus Partners – 2025 FinTech Awards winner for indirect tax management with specialized exemption certificate software
National and large firms
1. Bennett Thrasher
Bennett Thrasher launched its Denver office, led by Partner Richard Bartolanzo who relocated from Atlanta. As a Top 100 national CPA firm recognized by Accounting Today, Bennett Thrasher brings enterprise-level resources to Denver’s growing business community while maintaining the personalized service of a regional practice.
Core capabilities:
- Tax advisory, compliance, and consulting across federal and state jurisdictions
- Audit and assurance services for public and private companies
- Family office and estate planning for high-net-worth clients
- Technology and SaaS industry specialization
- Outsourced accounting and CFO advisory services
- Transaction advisory and business valuations
Industry focus:
Technology/SaaS, Construction, Real Estate, Manufacturing, Energy/Clean Tech, Hospitality, Family-owned businesses
Location:
1401 17th Street, Suite 1200, Denver, CO 80202
Contact:
(720) 995-6161
Best for:
Mid-market and enterprise businesses seeking a full-service national firm with dedicated Denver presence. Particularly strong for technology companies and family-owned businesses requiring sophisticated tax planning alongside audit services. The firm’s proximity to Union Station makes it accessible for downtown clients.
2. Forvis Mazars
Forvis Mazars earned the 2026 Best of Accounting Gold Award from ClearlyRated and was recognized in Forbes 2025 Best In State CPAs list, with multiple Colorado partners including Managing Partner Tammy Rivera receiving individual recognition. The firm combines global reach with strong regional expertise.
Core capabilities:
- Federal tax services and compliance
- International tax planning and structuring
- State and local tax (SALT) advisory
- Business tax compliance for corporations and pass-through entities
- Personal tax planning for executives and high-net-worth individuals
- Audit and assurance services
- Management consulting
Industry focus:
Financial services, Nonprofit organizations, Construction, Real Estate, Manufacturing, Distribution
Location:
1801 California Street, Suite 2900, Denver, CO 80202-2606
Contact:
(303) 861-4545
Best for:
Businesses with international operations or complex multi-state footprints requiring both domestic SALT expertise and global tax structuring. The firm’s size supports sophisticated engagements while maintaining strong local client relationships. Particularly valuable for companies in regulated industries requiring robust audit and compliance capabilities.
3. BDO USA
BDO USA is one of the largest accounting and advisory firms in the United States and serves Denver’s enterprise market with comprehensive audit, tax, and advisory services. The firm announced a Chief Data and AI Officer in 2024, signaling continued investment in technology-driven service delivery.
Core capabilities:
- Audit and assurance for public and private companies
- Tax planning and compliance across all jurisdictions
- Advisory services including transaction support
- Risk management and internal audit
- State and local income and sales tax compliance
Industry focus:
Technology, Healthcare, Manufacturing, Real Estate
Best for:
Large enterprises and publicly-traded companies requiring Big Four-adjacent capabilities with a more accessible service model. BDO’s global network supports businesses with international subsidiaries or expansion plans, while their technology investments appeal to companies seeking modern audit and advisory approaches.
4. Grant Thornton
Grant Thornton operates as a Top 10 global accounting firm serving Denver’s public and private enterprises across the Mountain West region. The firm balances global scale with a collaborative culture that emphasizes partner-level attention on engagements.
Core capabilities:
- Audit and assurance services
- Tax advisory and compliance
- Business consulting and transformation
- Financial planning and analysis
- Transaction advisory services
Industry focus:
Technology, Financial Services, Healthcare, Manufacturing
Best for:
Growing companies preparing for significant transactions—whether IPO readiness, private equity investment, or M&A activity. Grant Thornton’s middle-market focus means they understand the unique challenges of scaling businesses better than some larger competitors who primarily serve Fortune 500 clients.
5. Plante Moran
Plante Moran serves the Denver metro area with Top 15 national firm resources. Partner Angela Appleby was recognized by Forbes on its 2024 America’s Top 200 CPAs list. Her Plante Moran profile lists her office in Denver.
Core capabilities:
- Audit and assurance services
- Tax planning and compliance
- Business consulting and advisory
- Financial planning and analysis
- Industry-specialized practice groups
Industry focus:
Mid-market and enterprise clients across diverse industries
Best for:
Mid-market companies seeking a national firm known for its collaborative, client-first culture. Plante Moran consistently ranks among the best places to work in accounting, which translates to lower staff turnover and more consistent client service—a meaningful differentiator when your engagement team actually knows your business.
Mid-size regional firms
6. GHJ Advisors
GHJ Advisors opened its new Denver Tech Center office in 2025. Ranked #31 on the Denver Business Journal Top 55 Accounting Firms, GHJ operates as a Top 100 national firm and member of HLB International network spanning 150+ countries.
Core capabilities:
- Advisory services for growth and transformation
- Tax planning and compliance
- Accounting and audit services
- Industry-specific consulting
- International capabilities through HLB network
Industry focus:
Food & Beverage, Manufacturing, Nonprofit, Technology
Best for:
Established middle-market companies and innovative startups in the Denver Tech Center corridor. GHJ’s combination of national resources and international network through HLB makes them particularly valuable for companies with global supply chains or expansion plans. The firm’s food and beverage expertise addresses Colorado’s growing CPG sector.
7. TaxOps LLC
TaxOps LLC ranks #24 on the Denver Business Journal Largest Accounting Firms list. Founded in 2002 by Allen Gregory with 25+ years of Big Four experience, TaxOps specializes in acting as an outsourced tax department for complex businesses.
Core capabilities:
- Business tax consulting with strategic focus
- Income tax compliance for corporations and pass-through entities
- Multi-state taxation and nexus analysis
- State and local tax (SALT) planning
- R&D tax credit studies and documentation
- ASC 740/FIN 48 compliance for financial reporting
- IRC Section 382 studies for ownership changes
- Tax function optimization
Industry focus:
Technology, Manufacturing, Professional Services, Multi-state businesses
Location:
225 Union Blvd, Suite 325, Lakewood, CO 80228
Contact:
(720) 227-0070
Best for:
Growing companies with complex multi-state operations needing Big Four-caliber tax expertise. TaxOps excels at tax minimization strategies and compliance for businesses whose footprint has outgrown their internal capabilities. For sales tax specifically, companies often pair specialized providers like Zamp with firms like TaxOps—Zamp handles real-time rooftop-accurate calculations and automated filing across 13,000+ jurisdictions while TaxOps focuses on income tax strategy.
8. Topel Forman
Topel Forman maintains a Denver office alongside its Chicago headquarters, bringing over 60 years of independent operation to Colorado businesses. Recognized by Inside Public Accounting Top 200, AccountingToday Regional Leader, and as a Multi-year Top Workplace, the firm emphasizes hands-on partner involvement.
Core capabilities:
- Tax services including strategic planning, compliance, and year-round advisory
- Audit and attestation services
- Advisory services for performance enhancement, risk management, and growth planning
- Family office services for multi-generational wealth
Industry focus:
Individuals, Families, High-net-worth clients, Businesses across sectors
Team:
18 partners actively engaged in daily client operations
Best for:
Business owners and high-net-worth families seeking long-term relationships with partners who personally handle their work. Topel Forman’s independent ownership means decisions get made locally—not at a distant corporate office. Particularly strong for family office services where multi-generational wealth planning requires deep, ongoing relationships.
Technology-focused and specialized firms
9. Dark Horse CPAs
Dark Horse CPAs takes an advisory-first approach to tax services, emphasizing year-round strategic planning over transactional compliance. The firm’s “No Surprises” philosophy means proactive communication about tax implications before they become problems.
Core capabilities:
- Business tax preparation and strategic planning
- Multi-state tax planning and filing
- Bookkeeping and accounting services
- Fractional CFO services
- 1031 exchange guidance
- Rental property taxation
Industry focus:
Professional Services, Medical Practices, Real Estate, Manufacturing
Key team members:
Chris Papp, CPA (Denver) and Teddy Mizerak, CPA
Client perspective:
“Deep knowledge of financial structures and tax strategies… exceptional execution… goes beyond the numbers” – Joe Coombs, Unbridled Advisory
Best for:
Business owners who want a CPA relationship that goes beyond annual tax prep. Dark Horse excels at understanding Colorado’s flat tax and complex sales tax compliance challenges, then building proactive strategies around them. Ideal for entrepreneurs who see their accountant as a strategic advisor, not just a compliance requirement.
10. SDO CPA
SDO CPA delivers cloud-based accounting services with particular strength serving Denver’s technology and FinTech companies. Their virtual model works especially well for remote-first businesses with employees scattered across multiple states.
Core capabilities:
- Virtual CPA services including tax, bookkeeping, and advisory
- Colorado tax expertise including multi-jurisdictional sales tax
- Technology and FinTech industry specialization
- S-Corp and partnership tax optimization
- Multi-state nexus analysis
- Startup equity compensation planning
- R&D credit documentation
Industry focus:
Technology, FinTech, Healthcare, Startups
Technology stack:
QuickBooks Online, Xero, Gusto, Ramp
Client perspective:
“SDO CPA structured our equity compensation plan to minimize tax impact for our 15-person remote team across 8 states. They saved us from costly nexus mistakes as we scaled.” – Jessica L., FinTech startup CEO in RiNo, Denver
Best for:
Tech startups and remote-first companies needing a CPA who understands modern business models. SDO’s expertise in Colorado’s 66 home-rule city tax jurisdictions combined with their virtual delivery model makes them ideal for companies that don’t want—or need—in-person meetings.
11. Cornelius CPAs
Cornelius CPAs has served East Denver since 1988, developing deep expertise in local tax environments and specialized industries including cannabis. Led by Jordan with 15+ years of experience, the firm combines long-term relationship building with creative problem-solving.
Core capabilities:
- Full-service tax solutions for businesses and individuals
- Accounting and auditing services
- Business and personal finance advisory
- QuickBooks setup and ongoing support
- IRS representation with 15+ years experience
- Tax audit representation and defense
Industry focus:
Real Estate, Cannabis, Manufacturing, Retail, Small businesses, Startups
Location:
East Denver, CO
Contact:
(303) 625-4077 | info@corneliuscpas.com
Client perspective:
“Better understanding and more experience than any other CPA we’ve dealt with” – 10-year client
Best for:
Small businesses and startups seeking a local firm that will grow with them over decades, not just handle this year’s return. Cornelius CPAs’ cannabis industry expertise (including IRC 280E limitations) addresses a significant gap in Denver’s accounting market. Their IRS representation experience provides peace of mind for businesses concerned about audit risk.
12. Dimov Tax
Dimov Tax earned recognition on Clutch.co’s top Denver accountants list through their emphasis on responsiveness, precision, and technology-driven service delivery. Their digital platform enables secure document handling and remote collaboration.
Core capabilities:
- Tax preparation and planning
- Secure client portal for document management
- Digital form signing and report review
- Year-round tax support
Technology features:
- Secure document upload
- Digital form signing
- Online report review and collaboration
- Client portal access
Best for:
Tech-savvy individuals and businesses who prefer digital-first engagement over in-person meetings. Dimov Tax’s emphasis on convenience and responsiveness appeals to busy professionals who want efficient, modern service delivery without sacrificing accuracy.
13. WCG CPAs & Advisors
WCG CPAs & Advisors distinguishes itself through published, transparent pricing—a rarity in the accounting industry. Their fee structure page eliminates the guesswork that frustrates many business owners seeking accounting services.
Core capabilities:
- Individual tax preparation
- Business tax preparation
- Rental property tax preparation
- S-Corp election services
- Monthly bookkeeping
- Payroll services
- Sales tax filing
Geographic reach:
Primary focus on California, Nevada, Colorado, Texas, Midwest, Florida, and New England—licensed in all 50 states
Best for:
Small businesses wanting predictable accounting costs. WCG’s transparent pricing lets you budget accurately for accounting services, and their national reach supports businesses with operations across multiple states. Their sales tax filing service provides a basic option, though businesses with complex multi-state footprints may need more comprehensive solutions like Zamp’s managed service that handles registrations, calculations, and filings across all jurisdictions.
14. Clarus Partners
Clarus Partners won the 2025 FinTech Awards for Best FinTech for Tax Management through their AkuCert software for exemption certificate management. The firm specializes exclusively in indirect tax—sales, use, and exemption compliance.
Core capabilities:
- Indirect tax compliance and consulting
- Sales and use tax compliance
- Sales tax consulting and planning
- Use tax review and recovery
- Sales tax nexus analysis
- Audit representation and defense
- Voluntary disclosure agreements (VDA)
- Exemption certificate management (AkuCert software)
Industry focus:
Businesses across all sectors requiring indirect tax management
Best for:
Businesses needing specialized indirect tax expertise—particularly those facing audits, managing exemption certificates, or seeking use tax recovery. Clarus Partners’ award-winning AkuCert software addresses the exemption certificate management challenge that trips up many growing businesses.
When dealing with multi-state operations or Colorado’s complex local jurisdictions—many Denver businesses pair their CPA with dedicated providers. Zamp handles the real-time calculations, registrations, and automated filings across 13,000+ US jurisdictions and 70+ countries, freeing your CPA to focus on strategic tax planning and advisory work where their expertise delivers the most value.
Frequently asked questions
What services should I expect from a top accounting firm in Denver?
Leading Denver accounting firms provide comprehensive services including tax planning and compliance (federal, state, and local), audit and assurance, bookkeeping and accounting, advisory services, and industry-specific consulting. Larger firms add international tax capabilities, transaction advisory, and specialized practice areas. For sales tax specifically, many firms partner with dedicated providers since Colorado’s 66 home-rule jurisdictions create compliance complexity that requires specialized systems and expertise.
How does a regional firm like GHJ Advisors compare to a Big 4 firm for a mid-sized business?
Regional firms typically offer more partner-level attention, faster response times, and lower fees than Big 4 alternatives while still providing sophisticated capabilities. A firm like GHJ brings Top 100 national resources and international network access through HLB without the bureaucracy of the largest firms. Mid-sized businesses often find the sweet spot is a regional firm with national reach—big enough to handle complex needs, small enough to prioritize your account.
What are typical fees for a business accountant in Denver?
Fees vary significantly based on firm size, engagement complexity, and service scope. Always get detailed proposals from multiple firms—hourly estimates without scope definition lead to surprise invoices. Consider both the initial cost and the long-term value of proactive tax planning and strategic advice.
How do I ensure my chosen accounting firm can handle sales tax compliance effectively?
Ask specific questions about jurisdiction coverage, Colorado’s home-rule cities experience, and nexus monitoring processes. Many CPA firms acknowledge that sales tax compliance requires specialized systems they don’t maintain in-house. For businesses selling across multiple states, dedicated managed services provide real-time rooftop-accurate rates, automated filing, and audit support that generalist accounting firms typically can’t match.
What are the benefits of using a fully managed sales tax service compared to DIY software?
DIY software gives you tools but puts all liability on your company—you’re responsible for correct setup, rate accuracy, and filing compliance. Managed services like Zamp take on or share that liability while handling everything from registrations to calculations to filings. For startups to companies with substantial revenue, the difference is significant with managed service meaning tax experts monitor your compliance proactively, handle notices before they reach your mailbox, and provide audit support if questions arise. The time savings alone—customers report saving substantial hours monthly—often justifies the investment.
