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For Years, Peter J. McMahon, P.C. has Been Providing Quality, Personalized Financial Guidance to Local Individuals and Businesses. Our expertise ranges from basic tax management and accounting services to more in-depth services such as audits, financial statements, and financial planning. Peter J. McMahon, P.C. is one of the leading firms in and throughout the area. By combining our expertise, experience and the team mentality of our staff, we assure that every client receives the close analysis and attention they deserve.
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Peter earned his Bachelor of Business degree from Northeastern University and a Master's degree in Taxation from Bentley College. He worked as a tax accountant in private industry for companies such as Raytheon and Computervision and then in public accounting for Ernst and Young and Wolf & Company before striking out on his own.
We offer a comprehensive package of services designed for the needs of small businesses and their owners. All the services you need, including accounting, bookkeeping, tax planning, tax preparation, payroll and consulting. Our package is tailored to your needs and comes at a fixed monthly fee. We are QuickBooks ProAdvisors and can help set up, and improve QuickBooks Desktop and QuickBooks Online.
We start with an initial strategy session to help you understand and develop a plan for the entire year. Proactive business model. We reach out to clients regularly and encourage two-way communication to better understand your business. We perform monthly record-keeping so we can better spot trends and take advantage of tax savings opportunities.
Peter J. McMahon is a small business that has made an impact on other business' in and around the South Shore and Cape Cod area. With a wide rande of clients with business' in architecture, food and law, just to name a few, Peter J. MaMahon has a firm grasp on the diversity of the area. Below are testimonials from happy clients that are proud to be working with Peter J. McMahon CPA. This is our first year in business and while it has been very exciting, there have been many complex situations that require the expertise of a CPA.
Reviews (3)
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Nicholas Foley
Mar 21, 2021
Simply put, I would be lost with Sue's guidance during tax season! She is attentive, works quickly and accurately and makes sure any and all of my questions are answered. I highly recommend her services is you are looking for help during tax season!
Ana Walsh
Feb 23, 2021
Peter McMahon CPA is extremely professional and is always a huge help to our small business. The team is friendly, knowledgeable, dedicated and goes above and beyond to help us. We have been working with Sue DeFelice for over 6+ years and it was one of the best business decisions we've made. A true partner! We would not have been able to press on thru 2020 without Sue's support and guidance.

Along with day-to-day accounting and payroll needs, Sue assisted in submitting applications for the PPP as well as local and state grants. She was organized and detailed with each application; we were awarded all the funding requested! The customer service is next to none. They are always there when needed. Polite, efficient and always up to date on the current changes with tax rules. Give them a try - You won't be disappointed.
McMahon Insulation
Feb 15, 2021
I have used Peter McMahon CPA for almost 10 years now for payroll and accounting needs for my business. I find the entire team to be extremely professional, thorough, and knowledgeable. Payroll is always accurate and error free. I can always count on their expertise. They guided our business through COVID and PPP loans and were always there when we needed help. I cannot say enough good things about this firm.