Stephan P. McMahon & CompanyOffering innovative solutions that surpass traditional accounting, our comprehensive advisory programs transform client relationships into meaningful partnerships. This foundation drives sustainable growth, maximizes enterprise value, and propels your business forward. What does success mean to you?

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  • Thank you! The impact of your gift goes a long way in helping feed hungry children. With your help, Cape Kid Meals is changing the face of childhood hunger on Cape Cod.

    Tammy Leone – Cape Kid Meals

  • We've worked with Stephan and the team for the past 5-6 years. They are all very smart, responsive, and willing to work with us to find the best options for our business and personal tax needs.

    Scott Cheyne, Pretty Picky Properties

  • I have worked with and used several Accountants over the last 20+ years. SPM&Co are the Best of the Best! My Returns are filed timely, we have regular planning meetings, and there are never any surprises. They constantly provide us with information and insight to help us better plan for our tax obligations. I would highly recommend them.

    Joey Deolivera, DeOlivera Insurance Services

  • Very professional! Excellent customer service and attention to detail. I highly recommend SPM&Co!

    David Burine, Rapid REI Solutions

  • We are very happy with phenomenal services, professional approach and the nicest staff we have met! Thank you for all your help!

    Ben Feliciano, Good Guys Landscaping

  • If you’re looking for an honest and very capable accounting firm, you can't go wrong with Stephan P. McMahon & Company. They have been a part of my team for many years. They skillfully guided us through Covid and several audits.

    Roger Derosier, Expert Closets

  • Stephan and his team have never let my company down. They're organized, experienced, and thorough. My company would not have seen such success without their service and guidance!

    Curren Huyer, Your Friend with a Truck

  • As CEO of a startup company, I need professional help dealing with a wide range of finance and accounting issues. SPM solves my problems quickly and provides insightful advice for dealing with business challenges. I recommended them to another company I am invested in and they are now clients of SPM. Good decision!

    Rusty Warren – Armada Marine Robotics

  • Best in class! Hands down.

    Jon Clark – Nauset Management

  • I have use various CPA's throughout my career and Stephan is the best. He is proactive and not reactive. He strategizes solutions in advance which is quite refreshing.

    Steven Pizzuti – Pizzuti Law

  • It has been wonderful to develop a real business partnership between our two companies. I truly appreciated everything your firm has done for my business, and I will and have wholeheartedly recommend anyone who asks me to SPM&CO.

    Gail O’Rourke, President – White Wood Kitchens

  • Stephan and his staff are outstanding! I can strongly attest to their professionalism and knowledge. They are very proactive and make sure their clients are well aware of any changes and are quick with great advice! SPM&Co has been instrumental in helping me grow my business. Working with SPM&Co will be one of the best things you can do for the health and longevity of your personal and business financials.

    Brian Greer – Greer Real Estate

  • I admire your growth, stability and excellent reputation on the Cape. I'm very excited to be part of your team.

    Michael D. Pierce, Esq.

  • In December I had my first zoom meeting with Stephan. It was obvious from the start that my business was more than “another number."  He analyzed our situation and I learned more about my company during that 30 minute meeting, than I had in 10 years with previous accountants.  Stephan and his crew have been a valuable resource.  I feel 100% confident knowing that SPM&Co is in my corner!

    John Day – J Day Off Road

  • Amazing accountant! Extremely knowledgeable and professional. I recommend Stephan to anyone looking for a great accountant.

    Natalia Wiener – Gibson Sotheby’s International Realty

  • Thank you so much for taking the time to meet with us yesterday. Figuring out our withholdings together was very reassuring. Paul and I are so happy you are our accountant. You are very smart, capable, and personable too! We are in good hands!

    Leslie Chizek

  • Thank you for your support! Your donation helped make our event a huge success!

    Kelvin & Amy Ing – Cape Cod Challenger Club

  • It is great to know that we can reach out to you when needed. Thank you! We so appreciated how quickly you respond to help us and how committed you always seem to our family.

    John & Pam Domos – Domos Carpentry

  • Thank you for your great support! We appreciate your special attention to our “urgent” needs prior to and after leaving for Sierra Leone.

    Allen Morell – New Covenant Foundation, Inc.

Our forward focused Process
is our proven way in which we accomplish great results with our clients

We understand that it can feel “lonely at the top”. When you partner with SPM&Co, you’ll never have to navigate your entrepreneurial journey alone. Our advisory-first approach means we work closely with you to uncover your goals, identify your needs, and seize opportunities for growth. Together, we’ll chart a course of action that aligns with your vision and ensures long-term success. By aligning our energies into a particular program, we guarantee a partnership that delivers a truly winning experience.

Discovery

: 75 mins

In-Person/Video Session

  • About us / About you
  • Exploration of goals & needs
  • Introduce Advisory First approach

Schedule Alignment
Session

Gears

SPM&Co Team starts ideation of the plan:

  • Discovery meeting review
  • Review of client provided books/records
  • Opportunities, needs & goals assessment
  • Personalized Program services recommendation
Alignment

: 45 mins

In-Person/Video Session

  • Review proposed plan
  • Partnership & expectation alignment
  • Establish objectives & action plan

Affirm Program
Placement

Gears

SPM&Co Team begins onboarding process:

  • Welcoming & intake tasks completed
  • Schedule first advisory meeting
  • Kicks off the program & starts execution of the plan
Programs

Client Experience

Our commitment to our team and clients is “The Experience is the #1 Thing”. We ensure this outcome through consistent and continuous client engagement with ongoing follow-up during and after service delivery.

Advisory-First

Lead with Advisory

Advisory-First

At SPM&Co, we lead with advisory because proactive, strategic guidance goes beyond compliance once a year—it’s about driving year-round success. By focusing on forward-looking solutions, we help our clients make informed decisions, tackle challenges, and achieve their goals with confidence.

Success in the approach

We help give aspiring business owners the confidence they need when starting a business venture. We aid in defining and refining your plan, determining capital needs, reviewing entity selection and business structure, preparing budgets, and navigating you through all the important aspects of starting and then growing your business.

Success in the approach

BUSINESS FORMATION

Defining business worth

Business Valuation

Defining business worth

With help our clients answer questions involving compliance, litigation, and transaction consulting so they can have a clear picture of what their business and business assets are worth – giving them peace of mind as their business evolves or ascends to the next chapter.

Serving Cape Cod & the South Shore

SPM&Co “On Cape”

Cape Cod Accountant Office in West Yarmouth MA

196 Old Town House Rd,
West Yarmouth, MA 02673
(508) 775-0518

SPM&Co “Off Cape”

Plymouth, MA accountant office

57 Obery St #1,
Plymouth, MA 02360
(508) 830-0800


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