High-Touch CPA Services Focused on Delivering Clarity, Strategy, and Results
Mamacos, Bysiewicz & Associates is an entrepreneurial-minded CPA firm providing tax, assurance, and consulting services to the Northeast’s preeminent closely held businesses, shareholders, non-profits, and high-net worth individuals.
entrepreneurial
minded
Personalized
client service
strong team
Decades
of hands-on experience
We're A Full Service CPA Firm
Our team strives to make your life easier through our proactive approach, use of technology and our client service delivery model.
Financial Statement Audits, Reviews or Compilations
Business & Individual Tax Preparation
Strategic Tax Planning
Business Succession Planning
Transaction & Business Consulting
IRS Representation
Let Us Make Your Life Easier
Our small business CPA team is standing by to support you in your financial journey.
Let us know how we can make your life easier.
Built on Experience. Focused on You.
Founded by former Global 6 CPA firm partners, Mamacos, Bysiewicz & Associates (MB&A) was created to deliver the expertise of a national firm with the personal attention of a local one.
We work closely with privately held companies, family businesses, and professional service firms – providing clarity, consistency, and confidence in every engagement.
The Best CPA Firm for Your Business
Mamacos, Bysiewicz & Associates has decades of experience serving industries that power the New England economy, including:
- Construction & Real Estate
- Manufacturing & Distribution
- Technology & SaaS
- Hospitality & Restaurants
- Professional Services
- Employee Benefit Plan (ERISA) Audits
We understand your world and the numbers that drive it.
Why Choose Us As Your CPA Firm
At Mamacos, Bysiewicz & Associates, we focus on high-touch, relationship-driven service for owner-operated businesses.
We Have Years of Deep Expertise
Many business owners work hard each month but still wonder why profits seem low. We help you track costs, uncover opportunities, and set your business on a clear path to better profitability.
Our Service is Exceptional
We believe in accessibility and responsiveness. Our CPAs pick up the phone, respond to emails and are there for our clients.
We are Proactive
Our client services are designed to combat the assembly-line approach of public accounting. We’re a small and middle-market CPA firm that values going beyond simply checking compliance boxes, and adding value with proactive solutions for our clients.
We Offer Thoughtful Advice
Every recommendation is grounded in a clear understanding of your goals – whether you’re running a business, managing a nonprofit, or planning for personal wealth.
We Take a Long Term View
We’re here to be your ongoing advisors, helping you navigate change, growth, and opportunity with confidence.
Contact Our CPA Team Today
Let us know how we can make your life easier.
Why Choose Us As Your CPA Firm
Do I need a CPA or an accountant for my business or nonprofit?
Many business owners work hard each month but still wonder why profits seem low. We help you track costs, uncover opportunities, and set your business on a clear path to better profitability.
How much does it cost to work with a CPA firm?
Fees depend on the complexity of your needs, from annual tax filings to full audits or ongoing advisory support. Many MB&A clients find that proactive planning saves far more than it costs by reducing taxes, streamlining audits, and preventing compliance issues.
How do I find the right CPA firm for my organization?
Look for a firm that understands your industry and offers direct access to experienced partners. At MB&A, you’ll work with CPAs who know New England’s business landscape, combining technical depth with thoughtful, personal service.
What types of clients does MB&A work with?
We partner with privately held businesses, nonprofit organizations, and high-net-worth individuals across New England. Our clients value responsive service, proactive advice, and the assurance that their financials are handled by experts.
What areas do we serve?
We’re based in Newton, Massachusetts, and serve clients throughout Massachusetts, Connecticut, Rhode Island, New Hampshire, and across New England, both in-person and remotely.