Master Accounting and Tax Service

Who  We Are

Master Accounting and Tax Service, LLC (MATS) is known for providing the utmost excellence when it comes to bookkeeping, payroll and tax services. We care about our clients and uphold excellence at affordable costs backed by integrity. We work with a variety of clients ranging from small businesses to large companies in Arizona and  California.

We pride ourselves on being eco-friendly and are working to become 100% paper-free. This means that all our correspondence and services will be provided electronically. We understand that as a client you may be concerned about the safety and security of your information online. To ensure your trust, please note that we will provide you with a secure and encrypted web portal to hold all of your important documents. This means items like historical tax data will be easily accessible by you and secure from anyone else. Any information you store and transfer will be secured.

Our owner, Bill Mease, has an eclectic tax expertise background that he brings to the business. He has been a practicing accountant for over 25 years with an impressive background ranging from a government tax auditor, to a  staff accountant, assistant controller and controller. Bill brings an impressive resume to Master Accounting and Tax Service, including:

  • 25+ years of experience in accounting
  • A+ BBB Rating
  • Valid PTIN holder
  • Encrypted online database for client information to be transferred and held securely
  • Previous government tax auditor
  • Previous company controller

Our Mission

Our mission is to provide our clients with the highest quality  accounting, bookkeeping, payroll and tax services with exceptional customer support.  It is through our client’s success that we succeed.

who we are

Core Values

Quality bookkeeping, payroll and tax services at an affordable cost and with the utmost integrity.

We are able to serve clients anywhere in the United States through our advanced communications and client portals. 

We have offices in Tempe, Arizona and Port Hueneme, California.

Frequently Asked Questions


Our services are tailored to fit your specific needs. We provide confidential off-site and on-site services to meet your goals.

Please download our tax organizer from the Documents tab or  click here. Our organizer will ask all of the questions we need answered and list all of the documents that we need to prepare your taxes.


Master Accounting and Tax Service

Your Books Done Right.  Talk To An Expert Today | (805) 504-3800

One of the biggest problems that small business owners run into is getting bogged down by daily accounting tasks, including payroll, bookkeeping, and tax preparation. Let us help!
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