Our Approach to Single Audits

SD Mayer & Associates is your trusted advisory firm for A-133 audit compliance. We provide service with a personal touch and work with businesses, nonprofits and corporations to perform Single Audits that comply with the Single Audit Act, otherwise known as OMB Office of (Management and Budget) Circular A-133. Our team consists of dozens of skilled professionals, and we can leverage more than 40 years of experience to ensure that you fulfill all the requirements necessary to meet regulatory demands and qualify for future federal awards.


We have extensive experience working with the commercial sector and not-for-profit organizations, and our background provides us with unique advantages in the preparation of OMB Circular A-133 audit reports. Our team is deeply familiar with the complete list of rules and regulations surrounding A-133 audit compliance. We’re also among the first to know when the government makes changes, updates or additions to the laws. We can identify and categorize sources of funding to provide you with effective and efficient Federal OMB circular A-133 auditing services that meet your needs.

In addition to completion of your OMB Circular A-133 audit report, our holistic approach to Single Audit preparation includes:

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  • Supplemental risk analysis: Once we compile your financial data, we can analyze the results and compare them with your organizational strategies, searching for ways to mitigate your risks.
  • Value-added services: With a comprehensive assessment of your incoming and outgoing federal funds, we can find opportunities for improving your business practices with a focus on your success.

Why partner with sd mayer & associates?

SD Mayer & Associates is a global financial firm and the recognized industry leader in A-133 audit compliance for businesses, nonprofit organizations, educational institutions, municipalities and state governments. We provide tailored services for small to medium-sized entities with up to 1,000 employees, and we’ll place a personal focus on making sure your Single Audit is accurate, detailed and in line with all the requirements set forth by the federal government.

We always maintain close relationships with our clients. Your A-133 audit advisor in the Bay Area or our Silicon Valley office will keep you informed with clear and constant communication throughout the process. We utilize the latest in advanced auditing software to store information in a secure, protected, accessible location for all of our clients.


The United States government requires Federal OMB Circular A-133 audits for entities that expend at least $750,000 of federally allocated funds in a fiscal year — including grants and awards. These audits provide an in-depth financial assessment to ensure received funds are spent in compliance with the reasons they were allocated, and they’re a requirement to qualify for future funding. If you fail to submit an audit, you could face significant penalties under federal law, including suspension of funds and grant termination.


Audits help show potential supporters of your nonprofit that you are worth their investment of time and money. An audit proves that you are doing exactly what you claim to be doing with the funding you receive. They work as an accountability tool, holding you to your word and ensuring your funds go to the right place. They act as a form of oversight by promoting fiscal responsibility and honest accounting practices.

SD Mayer & Associates has seen firsthand the benefits of A-133 audits. We perform nonprofit single audits for businesses in the San Francisco Bay Area, across the country and around the world.


Trust your OMB Circular A-133 audit report to the experts. To schedule Single Audit preparation in the Bay Area, in San Francisco or from a remote location, please contact us today.

Thought Leadership

Our Audit Team

Kelly Hsu
Audit Senior
Stephen D. Mayer, CPA
Managing Partner & Founder
Elias Tarabay, CPA
Partner, Audit & Assurance
Kevin Wang, CPA
Senior Audit Senior
Bonifacio Zablan
Professional Support Specialist
SD Mayer