About Us

We are a woman-owned, small business in Tucson metro area, Arizona. Our business started in California in 2001.  It is our philosophy to provide the greatest amount of assistance to ensure the smooth running of your business life. You will be treated like a person, not an account number.

Catherine McLarnan is the owner of MBS. Currently, she has experience as a tax professional and is Listed in the IRS AFSP program.  In May 2019 Catherine graduated with her Master’s Degree in Accounting including extra coursework in auditing, forensic accounting, and fraud examination.

Our office provides outstanding service to our clients because of our dedication to the three underlying principles of professionalism, responsiveness, and quality.


By combining our expertise, experience and the energy of our staff, each client receives close personal and professional attention.

Our high standards, service and specialized staff spell the difference between our outstanding performance and other firms. We make sure that every client is served by the expertise of our whole office.


Our office is responsive. Companies and individuals who choose us rely on competent advice and fast, accurate personnel.

To see a listing of our services, please take a moment and look at our services page. Because we get new business from the people who know us best, client referrals have fueled our growth in the recent years.  Through hard work, we have earned the respect of the business and financial communities. This respect illustrates our diverse talents, dedication and ability to respond quickly.


An office is known for the quality of its service. Our reputation reflects the high standards we demand of ourselves.

Our primary goal as a trusted adviser is to be available to provide insightful advice to enable our clients to make informed financial decisions. We do not accept anything less from ourselves and this is what we deliver to you.  We feel it is extremely important to continually professionally educate ourselves to improve our technical expertise, financial knowledge, and service to our clients.

We will answer all of your questions, as they impact both your tax and financial situations. We welcome you to contact us anytime.

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