Keystone CPA, Inc.
Fullerton, CA
Keystone CPA specializes in proactive tax planning for real estate investors, business owners, and high-income earners nationwide. They focus on structuring income and investments to reduce tax liabilities, offering flat-fee services for clear pricing.
5 Reviews
★★★★★
Kelly (our personal tax strategist) was absolutely wonderful to work with. She took the time to truly understand our very complex tax situation and approached every detail with incredible knowledge, patience, and professionalism. Her expertise, strategic thinking, and thoughtful solutions gave us so much clarity and confidence moving forward, and we are genuinely grateful for her guidance. We would highly recommend Kelly and Keystone CPA to anyone looking for exceptional tax strategy and support.
★★★★★
Working with Amanda Han and the Keystone CPA team has been an incredible experience. They have been fantastic at navigating my complex tax situations and helping me define clear, highly effective tax strategies. Their communication is top-notch—always professional, timely, and easy to understand. If you need a proactive partner for your taxes, I highly recommend them!
★★★★★
We've been working with Keystone CPA for about 9 months, and it's been refreshing to have someone with so much knowledge in our corner, especially when we're making complex financial decisions that will impact us as we begin to think about retirement.
We began working with Keystone in 2025, and they guided us through a Cost Seg. We saved $$$ on our taxes, and for the first time in 10 years, we received a refund. But even more than savings, they've helped connect us with an estate lawyer, a business acquisition lawyer, and they've provided guidance through business acquisitions and planning for future real estate.
They are genuinely committed to helping their clients. I'd recommend them to anyone that needs better financial strategies.
★★★★★
We have worked with Keystone CPA for the past seven years, and they have been an exceptional partner throughout every stage of our growth. Over the years, our work has evolved into three distinct education-based businesses spanning consulting, advocacy, and publishing, and Keystone has consistently provided the strategic guidance and financial insight needed to support that expansion.
What we appreciate most is that they go far beyond tax preparation. They have helped us think proactively about business structure, tax strategy, and long-term financial planning in a way that has brought both clarity and confidence to our decision-making. Their team is knowledgeable, responsive, professional, and always willing to help us navigate the complexities that come with a growing and evolving business.
It is rare to find a CPA firm that is both highly competent and genuinely supportive, but Keystone has been exactly that for us. We are incredibly grateful for their partnership and would highly recommend them to any individual or business looking for trusted, strategic financial support.
★★★★★
The Keystone group is phenomenal! Adrian is very knowledgeable and a great tax advisor and helped me save thousands of dollars with the right strategies. He and his team made the tax return preparation process extremely organized, smooth and fast. They are worth every penny and their price reflects the high quality of service and high knowledge level. I can’t recommend them enough!!