Master Accounting and Tax Service, LLC (MATS) strives to provide the client with quality accounting, tax, bookkeeping, and business services at an affordable cost and with the utmost integrity. We work with small businesses and enterprise level companies all over the metropolitan Phoenix area.

We are working toward becoming a "paperless office" as well as an internet based company. We offer our clients the convenience of dealing with us strictly online. We provide all of our clients with a secure, encrypted web portal to always have all historical tax documents at their fingertips and to provide them with a secure means to transfer information to us or receive information from us.

The owner, Bill Mease, brings a rare level of tax expertise to the table for clients; he has been a practicing accountant for over 25 years, working for government agencies as an auditor, businesses as a staff accountant, an assistant controller and controller. In 2004, Bill established MATS and operates his growing accounting and tax practice in Tempe.

  • 25+ years experience in taxes and payroll
  • A+ BBB Business Review Rating
  • Experienced government tax auditor
  • Staff consultant for businesses
  • Secure and encrypted online capabilities
  • Registered tax return preparer and Valid PTIN holder

"The job of a tax accountant is to protect their client by ensuring that the client is taking advantage of all available tax saving opportunities as well as paying only their share of tax liability by preparing an accurate and honest tax return."

Owner, Bill Mease

Honesty and Integrity - It is of utmost importance that we provide all of our services in an ethical and fair manner.
Quality - We strive to provide the highest quality service possible to our clients that will meet or exceed their expectations.
Professionalism and Knowledge - We are continually learning and growing in order to provide our clients with the most current tax law and advice.
Dignity and Respect - We treat every client with dignity and respect.

Premier provider of accounting, tax preparation, and payroll services for small business and individuals in Phoenix


Here's what some of our satisfied clients have to say about their experience with us.

Individual and Small Business Tax preparation customer

Meg Hoffman

I thank my lucky stars for the day Master Accounting agreed to see me and discuss my problems. I had an overwhelming amount of receipts and confusion with multiple investments, a closed business, a divorce and had kept postponing sorting everything out and filing taxes until years passed. I didn't know where to begin to file unpaid taxes. The weight of the world was on my shoulders. Bill Meese was so kind, patient, and diligent in helping me to unfold my story and give the information he needed. He began what I thought was an impossible task. He was fair, thorough, and answered every question for me. Eventually every previous year was filed and paid for. Many years have gone by now since that first encounter with all that catch-up and massive amounts of paperwork are but a memory. I will be forever grateful to Bill for his excellent work. Altho I doubt there's anyone else out there in the mess I was in at that time; but no one could do better than Master Accounting to put their mind at ease and feel confident their obligations are in good hands.

Personal and Company taxes customer

Stephen Lockwood

Bill has been preparing my individual and rental property taxes for years. He thoroughly explains everything to me and answers any questions I have, even throughout the year. It has been a great benefit for me to have him handle my complicated IRA’s and rental property taxes including some additional write offs I would have never known about. He is very honest and will call me if anything comes into question so that I always remain in compliance. My parents and brother have trusted his services for years as well. I recommend him to anyone who is serious about a tax and accounting professional.

Business and Individual taxes client

Michael Schwahn

Bill was recommended to me by a friend who has worked with him for many years. He has been my accountant for the past three years and has helped me get refunds with my Individual taxes and Company taxes every year. This past year I was audited by the IRS and Bill helped me decrease the amount owed from $3300 to $750! He is a life-saver! I am very appreciative of his continued guidance and wisdom. I highly recommend Master Accounting!


Come see us or send us a message to learn more about how we can help you today.

Professional Memberships