About Tull, Forsberg & Olson, CPAs

Founded in the early 1950s, our firm is one of the longest continually operating CPA practices in Phoenix, Arizona, serving clients with consistency, integrity, and professional judgment across generations. Clients turn to us for precise accounting, dependable tax strategy, and attestation services grounded in a practical understanding of how organizations actually operate.​

How we work

Our team includes experienced CPAs, tax professionals, auditors, and advisors who bring clarity to complex financial issues and regulations. Whether assisting a business through growth, providing tax planning, preparation, and consulting, or delivering financial statement audits, reviews, and compilations, we approach every engagement with focus, responsiveness, and accountability.​

Long-standing relationships are central to our practice philosophy, and many clients have worked with us for multiple generations. They value accurate work, timely communication, and a partner who understands the history of their organization as well as where they are headed.

Services we provide

We offer a full range of accounting, attestation (financial statement audits, reviews, and compilations), and tax services for privately held companies, nonprofit organizations, and individuals across Arizona. While our work spans multiple industries and entity types, our approach remains consistent: reduce unnecessary complexity, meet clients where they are, and deliver practical, actionable solutions.​

Who we serve

Our clients represent nearly every major sector of the Arizona economy, including:

  • Construction and real estate
  • Manufacturing and distribution
  • Nonprofit and charitable organizations
  • Professional services (legal, medical, engineering, and related fields)
  • Restaurants and hospitality groups
  • Employee benefit plans, including 401(k) and other retirement plan audits
  • HUD-insured mortgage and cost certification engagements

Whether the priority is compliance, efficiency, growth, or peace of mind, clients rely on our experience and our commitment to accuracy and steady guidance.

Audit and Accounting Services

Audit Services
Reviews & Compilations
Financial Forecasts & Projections