We are a California CPA firm, based in Hayward, providing businesses, their owners and managers accounting, tax and consulting services.


Stephan Mueller, CPA is a highly-experienced firm dedicated to providing reliable accounting services and financial advice to our wide range of business and individual clients. We are among the most highly regarded California CPA firms because we always put our clients’ needs first. We view every client relationship like a partnership, and truly believe that our success is a result of your success.


Our services include comprehensive tax planning and preparation, all facets of accounting and bookkeeping, general business advising, and much more. We’re proud to serve businesses, their owners and managers.


We also work with trustees and their attorneys on preparing fiduciary tax returns.


We provide services throughout the “Golden State”including cities like Walnut Creek, Hayward, San Diego, Dublin, Pleasanton, Los Angeles and others.


Call our California CPA firm today at (925) 327-1100 for a confidential and informative consultation.


Stephan is a native-born Californian and proud of it. He graduated from U.C.L.A. and has over 30 years experience in public accounting. He started in public accounting in Beverly Hills and Los Angeles.  When living in SoCal besides getting his auditing experience to become a CPA, he also managed to have time for being a controller of a printing company and later a large real estate developer in San Diego.  Then he moved to New York where he was employed for almost 15 years in public accounting as a senior manager and partner. He happily moved back to California to be with his family in 2010.

Stephan Mueller, CPA
As the owner and founder, Stephan Mueller has helped many clients solve their tax and accounting problems. He performs income tax planning and preparation for individuals, partnerships, C and S Corporations, and fiduciaries. Stephan has worked with clients in many industries and has specialized knowledge in the construction, real estate, printing, non-profit, healthcare, and manufacturing industries.