Achieving Excellence Through Personalized Solutions

We pride ourselves on delivering outstanding results by working closely with you to identify the most effective solutions for your unique needs. With a wealth of experience, we leverage our expertise to ensure optimal outcomes for our clients.

Trusted Partnerships for Success

At our core, we consider ourselves your dedicated partner in success. As a firm, we strike the perfect balance—we are sufficiently large to provide a comprehensive range of professional services at competitive rates, yet small enough to provide the individualized attention that you deserve. Our commitment is to build enduring relationships that foster mutual success and growth.

Reliable Support for Peace of Mind

In times of need all throughout the year, you can rely on us to seamlessly manage every aspect for you. Our firm is well-prepared and capable of handling most challenges that may arise, allowing you to focus on what truly matters to most you. Experience the relief of knowing that you have a dedicated team ready to navigate complexities of the world of taxes on your behalf.

Why Choose Us

  • Expertise: Our team comprises seasoned tax professionals with a deep understanding of the ever-evolving tax landscape.
  • Client-Centric Approach: Your financial well-being is our priority. We offer personalized services, addressing your specific needs and concerns.
  • Confidentiality: Trust is paramount. Rest assured that your financial information is handled with the utmost confidentiality and security.
  • Results-Driven: Whether it’s maximizing deductions, providing strategic advice, or representing you in an audit, we are dedicated to achieving the best results for our clients.

At Keil Tax Service, we believe in simplifying the tax process for our clients, allowing them to focus on what matters most – their business and personal goals. Contact us today for reliable, professional, and client-focused tax services that go beyond expectations.

Staff Profiles

David J. Keil, EA

David Keil is a graduate of San Diego State University where he majored in Communication. He is an Eagle Scout and has worked for various prestigious companies as The Walt Disney Company, SeaWorld San Diego, Marriott Hotels & Resorts, and is a former Senior District Executive with the Boy Scouts of America. After transitioning into work as a financial service representative for a major credit union, he made the decision to become a tax professional. Joining his father’s firm and following in his footsteps, David became an Enrolled Agent in 2015. He has served as an active board member of the Orange County Chapter of the California Society of Tax Consultants and was elected to serve as Chapter President in 2020. He enjoys giving back by volunteering with Boy Scout Troop 850 in Villa Park and serves as coordinator for their annual leadership training weekend. He and his wife, Amber, reside in the city of Orange.


Sylvia Q. Guzman, CRTP

Sylvia Guzman went to Fullerton College where she received a Legal Administrative Assistant Certification. She has an extensive professional background of 30 years within the Automobile Finance Industry before she moved to Home Loan Origination. Sylvia is a former Real Estate Agent with an active California Real Estate License since 2005. She has served as an office manager tackling numerous challenges, and in 2022 became a California Registered Tax Preparer. She is an active member of the California Society of Tax Consultants Orange County Chapter. In her free time, she enjoys spending time with her family. Her husband, children and grandchildren reside in the City of Anaheim.


In Memory of Our Beloved Founder

John C. Keil, EA

John Keil attended California State University Fullerton where he majored in Business Administration with an emphasis in Finance and Economics. He was a former major bank Vice-President who, after 29 years, reinvented himself as a tax professional. He became an Enrolled Agent in 2001 and specialized in small business and individual taxation, as well as trusts and estates. John served as President of the Orange County Chapter of the California Society of Tax Consultants and dedicated time as an instructor for educational seminars for many years. He and his wife, Sandra, resided in the city of Orange for over 40 years before his passing in May of 2022.