Business consulting for privately held companies.
Guastella Advisors partners with owners to reengineer the financial infrastructure of the business, so it runs on better information, carries more scale, and is ready long before anyone asks to see the numbers.
The financial house should have been in order all along.
Most privately held businesses experience finance as compliance: close the books, file the return, hand over the statements. Useful, but a long way from a business that can actually be managed, scaled, or sold on favorable terms.
GA is built differently. We rebuild the financial layer of the company from the inside: how data is captured, how fast it arrives, what it reveals about pricing and margin, and how it informs the operating decisions in front of the owner.
The owners we work with are usually thinking about what comes next, whether that means passing the business to family, handing it to a management team, or selling it outright. The next owner pays for scalability and transparency. So does this one.
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 privately held businesses have never had access to the kind of financial infrastructure 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 quality of earnings and sale readiness to forecasting, 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.