A high-caliber CPA firm, built for privately held business.
Guastella Advisors, PLLC is a Michigan-licensed CPA firm bringing the kind of financial strategy, discipline, and growth services that large enterprises take for granted to the privately held companies that drive the real economy.
Well-managed finances are what make a small business special.
Most small businesses experience finance as compliance: close the books, file the return, hand over the statements. Useful, but a long way from financial leadership.
GA is built differently. As a CPA firm focused on advisory and growth services, our central product is decision support: the analysis, modeling, lender posture, pricing and margin work, and operating cadence that lets an owner make higher-quality choices, faster.
When that work is done with discipline, ordinary businesses become durable, profitable, and eventually valuable in ways their owners didn't expect. That is the standard we build to.
Jonathon A. Guastella
Jonathon built Guastella Advisors out of a deep conviction: privately held businesses are the backbone of the real economy, and when their finances are managed with the right discipline and care, they can become genuinely special, durable, profitable, and built to outlast the owner.
Most small businesses have never had access to the kind of financial leadership that large enterprises take for granted. GA was founded to close that gap, pairing the technical foundation of a CPA with the strategic lens of an MBA across every engagement.
Jonathon stays personally engaged on the substantive work for every client, from forecasting and capital decisions to lender conversations, profitability analysis, and long-range planning. The high-level thinking does not get handed off.
CPA-grade discipline
A licensed Michigan CPA firm. The technical rigor of public accounting, applied to the strategic questions in front of the owner.
Owner-aligned
We sit on the same side of the table as the owner, translating numbers into the decisions that shape cash, margin, and growth.
Built to scale with you
From a first 13-week cash forecast to capital strategy, profitability work, and exit readiness, the firm grows as the questions get sharper.
A premier CPA and advisory platform, built deliberately, in the right order.
Today the firm's practice spans fractional CFO work, financial strategy, profitability and margin analysis, lender management, scalability consulting, and transaction support. Tomorrow, we'll extend that foundation into a broader CPA platform, built on the same standard of discipline and owner-mindedness that defines the firm today.
Let's talk about where your business is headed.
A focused conversation with Jonathon. No pitch, no obligation.