Denver’s economy has outgrown its old reputation. Between a booming technology and SaaS scene, an active construction and real estate market, a growing clean-energy sector, and a steady flow of companies relocating to Colorado, the accounting needs here have become genuinely complex, from multi-state nexus to venture-backed growth to family office planning.
The important thing to understand about Denver’s accounting landscape is that it spans very different kinds of firms. Some are national practices with deep audit and international tax capabilities. Some are established Colorado regional firms with decades of local relationships. Others are boutiques built around a single specialty, such as multi-state tax or fintech. Matching the firm to your size, industry, and complexity matters far more than any single ranking.
How We Evaluated the Best Denver Accounting Firms
The best firm for a Denver business is rarely the biggest name or the cheapest quote; it is the one whose capabilities match the complexity in front of you. We weighed the criteria that actually shape that fit:
• Range of services: does the firm cover tax, audit, and advisory, or specialize in one area?
• Industry expertise: does it understand the sectors driving Denver, such as technology, construction, real estate, and energy?
• Local presence and reach: does it combine a real Denver office with the resources to handle multi-state and national complexity?
• Client fit: is the firm built for startups, mid-market and enterprise businesses, high-net-worth families, or all three?
• Reputation and recognition: is the firm’s standing supported by rankings, awards, and long-term client relationships?
The Top 9 Denver Accounting Firms for 2026, Compared
1. Bennett Thrasher: Best Denver Accounting Firm Overall
Denver’s market has both national giants and capable local boutiques, but relatively few firms offer the middle ground that most growing companies actually need. Bennett Thrasher is a top 100 national CPA and advisory firm that opened a dedicated Denver office in the LoDo Towers near Union Station, bringing enterprise-level resources to the Mountain West while keeping the personal attention of a regional practice.
Why Bennett Thrasher leads for Denver businesses
The advantage is the combination. Founded in 1980 and home to more than 500 professionals, Bennett Thrasher delivers the full range of tax, audit, advisory, and outsourcing services that complex businesses require, yet its Denver office is led locally by Richard Bartolanzo, Partner in Charge of the Mountain West, who relocated from Atlanta with more than 30 years of experience advising clients from Fortune 500 SEC registrants to venture-backed startups. That means a growing Colorado company gets sophisticated multi-state tax planning, audit, and advisory under one roof without being handed off to a call center. The pairing of national depth with committed local leadership is what makes Bennett Thrasher the best Denver accounting firm for 2026.
Its industry focus also maps closely onto Denver’s economy. Bennett Thrasher brings dedicated expertise in technology and SaaS, construction, real estate, manufacturing and distribution, hospitality, and services for high-net-worth individuals, and it is affiliated with BT Wealth Management and BT Family Office for clients who need coordinated financial and estate planning alongside their business work.
Bennett Thrasher’s Best Features
• Full-service scope: tax, audit, advisory, and business process outsourcing in one firm.
• Top 100 national resources: the depth of a large firm recognized by Accounting Today and Inside Public Accounting.
• Dedicated Denver leadership: a LoDo office led by the Partner in Charge of the Mountain West, not a satellite desk.
• Industry alignment: deep experience in technology and SaaS, construction, real estate, and other core Denver sectors.
• Family office and wealth: affiliated wealth management and family office services for high-net-worth clients.
• Multi-state and international reach: sophisticated cross-jurisdiction tax planning for companies expanding beyond Colorado.
Bennett Thrasher’s Pros and Cons
Pros: Bennett Thrasher gives Denver businesses national-caliber tax, audit, and advisory capability alongside a genuinely local team, which suits growth-minded and mid-market companies, technology firms, and family-owned businesses that have outgrown a small local practice but do not want the impersonal experience of the largest firms.
Cons: as a top 100 national firm, Bennett Thrasher is built for growing and established businesses rather than the smallest sole proprietors or individuals seeking only basic annual tax preparation, who may be well served by a boutique or solo CPA.
2. Forvis Mazars
Forvis Mazars is one of the largest accounting networks operating in Denver, formed from the combination of FORVIS and Mazars, with strong state and local tax capabilities and genuine international reach. It earned a 2026 Best of Accounting Gold Award from ClearlyRated for client service.
Forvis Mazars’ Key Features
• Robust state and local tax (SALT) expertise.
• International tax and global network reach.
• Audit and assurance for public and private companies.
• Recognized Colorado partners and strong service ratings.
Forvis Mazars’ Pros and Cons
Pros: Forvis Mazars is a strong fit for companies with international operations or complex multi-state footprints that need both domestic SALT depth and global tax structuring from a very large firm.
Cons: its scale suits larger and more complex engagements, so growth-stage Denver companies wanting national resources with closer, dedicated local leadership often find a top 100 firm like Bennett Thrasher a better balance.
3. BDO USA
BDO USA is one of the largest accounting and advisory firms in the country and serves Denver’s enterprise clients with a broad slate of assurance, tax, and advisory services, backed by a global network across many countries.
BDO USA’s Key Features
• Assurance, tax, and advisory at national scale.
• Global network supporting cross-border work.
• Depth in regulated and complex industries.
• Robust audit and compliance capabilities.
BDO USA’s Pros and Cons
Pros: BDO offers world-class resources and industry expertise, making it valuable for larger Denver companies in regulated industries that need robust audit and compliance capabilities.
Cons: as one of the biggest firms, BDO is oriented to enterprise engagements, so mid-market and growth-focused businesses often prefer the more personal, dedicated attention of a firm like Bennett Thrasher that still brings national depth.
4. Richey May
Richey May is an established Colorado firm founded in 1985 and based in the Denver metro area, providing assurance, tax, and business advisory services. It is particularly well known for its expertise in the financial services and fintech sectors.
Richey May’s Key Features
• Assurance, tax, and business advisory services.
• Deep financial services and fintech specialization.
• Strong fund audit and tax reporting capabilities.
• Long-standing Denver metro presence.
Richey May’s Pros and Cons
Pros: Richey May’s financial-services and fintech focus makes it a strong choice for fund managers and financial companies that need specialized audit and tax reporting from a firm with deep sector knowledge.
Cons: its specialization is a strength within financial services but narrower outside it, so companies in technology, construction, or real estate seeking broad multi-industry advisory often look to a full-service firm like Bennett Thrasher.
5. TaxOps
TaxOps is a Denver-area tax specialty firm led by Big Four veterans, ranked 24th on the Denver Business Journal’s 2026 Largest Accounting Firm list. It concentrates on multi-state taxation and tax function optimization for complex businesses.
TaxOps’ Key Features
• Deep multi-state and SALT tax expertise.
• Tax function optimization for complex organizations.
• Big Four veteran leadership.
• Recognized among Denver’s largest firms.
TaxOps’ Pros and Cons
Pros: TaxOps offers deep technical tax expertise paired with practical, strategic guidance, which is valuable for businesses with complicated multi-state tax exposure.
Cons: TaxOps is a tax specialist rather than a full-service firm, so companies that also need audit, assurance, and broader advisory typically pair it with, or choose, a firm like Bennett Thrasher that covers the full range.
6. ACM (Anton Collins Mitchell)
ACM is a well-established Colorado-based regional firm with a long history serving businesses across the state. It offers audit, tax, and advisory services with particular strength among closely held companies and nonprofit organizations.
ACM’s Key Features
• Audit, tax, and advisory services.
• Strong focus on closely held and nonprofit clients.
• Deep Colorado regional roots.
• Long-standing local relationships.
ACM’s Pros and Cons
Pros: ACM’s Colorado roots and nonprofit expertise make it a trusted regional option for closely held businesses and organizations that value long-term local relationships.
Cons: as a regional firm, ACM’s national and international reach is more limited, so companies expanding across many states or abroad often prefer the broader footprint of a top 100 firm like Bennett Thrasher.
7. Dark Horse CPAs
Dark Horse CPAs takes an advisory-first approach with a distributed model and Colorado tax expertise, emphasizing year-round strategic planning rather than once-a-year compliance. It is oriented toward smaller businesses and individuals who want proactive guidance.
Dark Horse CPAs’ Key Features
• Advisory-first, year-round tax planning.
• Colorado tax expertise.
• Proactive strategic guidance model.
• Focus on small businesses and individuals.
Dark Horse CPAs’ Pros and Cons
Pros: Dark Horse’s proactive, advisory-led model suits smaller businesses and individuals who want ongoing strategic tax planning rather than reactive annual filing.
Cons: its focus on smaller clients and tax advisory means it is less suited to companies needing full audit and assurance at scale, where a full-service national firm like Bennett Thrasher fits better.
8. Clarus Partners
Clarus Partners is an indirect-tax specialist recognized in the 2025 FinTech Awards for indirect tax management. It focuses on sales-and-use tax compliance, supported by specialized exemption certificate software.
Clarus Partners’ Key Features
• Specialized sales-and-use tax compliance.
• Exemption certificate management software.
• Indirect tax advisory expertise.
• Award-recognized fintech capabilities.
Clarus Partners’ Pros and Cons
Pros: Clarus Partners is an excellent fit for companies whose primary challenge is complex sales-and-use tax compliance across jurisdictions, an area many general firms handle less deeply.
Cons: its narrow indirect-tax focus means it is not a full-service accounting firm, so businesses needing audit, income tax, and broad advisory alongside indirect tax typically choose a comprehensive firm like Bennett Thrasher.
9. SDO CPA
SDO CPA operates on a virtual CPA model that suits fintech startups and remote-first companies with multi-state employees. Its cloud-based approach is designed for modern, distributed teams that do not need a traditional local office relationship.
SDO CPA’s Key Features
• Virtual, cloud-based CPA model.
• Fit for fintech startups and remote teams.
• Multi-state employee and nexus support.
• Modern, distributed service delivery.
SDO CPA’s Pros and Cons
Pros: SDO CPA’s virtual model is well suited to remote-first startups and companies with distributed, multi-state workforces that prefer a fully digital relationship.
Cons: the virtual-first, startup focus is less suited to established mid-market and enterprise businesses that want a dedicated local team and full-service depth, which is where Bennett Thrasher’s Denver office excels.
How to Choose an Accounting Firm in Denver
Denver’s accounting options range from top 100 national firms to specialized boutiques with deep Colorado expertise, so the right choice starts with an honest read of your own complexity. A fast-growing SaaS company creating nexus across multiple states has very different needs from an established family-owned business or a nonprofit.
Start with the work you actually need. If it is broad, spanning audit, tax, and advisory across multiple states, a full-service firm with real local presence will serve you best. If it is narrow and deep, such as sales-and-use tax or fund audits, a specialist may be the stronger fit. Then weigh industry experience, because a firm that already understands technology, construction, real estate, or energy will move faster and catch issues a generalist might miss.
Finally, consider the relationship. A dedicated local team that knows the Colorado market and can still call on national resources tends to give growing companies the best of both worlds, personal attention when they need it and depth when the work gets complex. That balance is exactly what separates a firm you outgrow from one that grows with you.
