CAS

Outlook 2026: Agentic AI Reaches the Tipping Point in Tax and Accounting Firms

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AI-powered firms are closing books faster, reallocating staff time to higher-value work, and widening the competitive gap with slower adopters.

By CPA Trendlines Research
Cornerstone Report

As artificial intelligence transitions from a buzzword to a business imperative, CPA firms across the U.S. are quietly beginning to deploy generative AI assistants, machine learning tools, and “agentic” AI platforms to automate audits, prepare taxes, and provide financial insights.

With the astonishing surge in AI adoption, firm leaders say we’ve reached a tipping point where those not investing in AI risk being left behind.

MORE CPA Trendlines Cornerstone Reports

In this Cornerstone Report, accounting firms show how they are leveraging AI to transform their operations, the benefits and challenges they are encountering, and what it all means for the future of the profession, including:

  • Why AI adoption in CPA firms has hit a tipping point
  • How agentic AI is transforming tax, audit, and advisory work
  • The real productivity, ROI, and revenue gains firms are reporting
  • What AI means for staffing, skills, and firm economics
  • The risks, governance challenges, and regulatory implications ahead
  • How firm leaders can deploy AI without falling behind

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Why Most CAS Practices Stall | It’s Not Just the Numbers

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…And what the successful ones do differently.

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It’s Not Just the Numbers
With Penny Breslin and Damien Greathead
For CPA Trendlines

Client Accounting Services (CAS) has moved well beyond bookkeeping. For firms serious about advisory, CAS is now a fundamentally different operating model, one that demands new roles, new systems, and a far higher level of internal transparency than traditional tax or audit practices ever required. 

In this episode of It’s Not Just the Numbers, Damien Greathead and Penny Breslin draw on more than two decades of shared experience to unpack what actually makes a modern CAS practice work in the real world. Their discussion goes beyond theory and into the structural, cultural, and operational decisions firms must confront if they want CAS to be scalable, profitable, and sustainable . 

MORE Penny Breslin and Damien Greathead | MORE Advisory & Consulting | BUY “It’s Not Just the Numbers”

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Traditional accounting firms are built around specialization and hierarchy: junior and senior accountants, bookkeepers, managers, and partners, each working essentially in isolation on their own client list. That structure works for compliance, but it breaks down in a CAS environment. 

“CAS requires the team to approach the client holistically,” Breslin explains. “You can’t have people operating in silos. Everyone needs to understand the client’s goals, not just their individual task.” 

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Outlook 2026: AI, Not Layoffs, Powers PE Valuations

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How CPAs are using AI to boost EBITDA multiples.

Ilya and Victor Radzinski, TaxDome co-founders

By CPA Trendlines

Private equity investors are paying higher prices for CPA firms that deploy artificial intelligence to expand capacity, deepen professional benches, and systematize growth—rather than cut headcount.

MORE TaxDome | MORE Private Equity

“If AI were about to replace accountants and advisors, private equity wouldn’t be pouring billions into the sector,” TaxDome founders Ilya and Victor Radzinsky say in a public letter to stakeholders.

As dealmaking accelerates into 2026, the shift helps explain why valuation multiples for accounting firms continue to rise even as automation spreads through tax, audit, and advisory workflows. Private equity sponsors and strategic consolidators have completed hundreds of acquisitions of CPA firms since 2020, often at valuation multiples that would have been rare a decade ago.

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Cracking the Code of Modern CAS: A New Era Begins

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What’s Next for CASExtreme close up of female hand with pen pointing on cash flow document.

 

 

By Hitendra Patil

The accounting profession is evolving rapidly. If you work at a firm today, you likely feel the urgency to adapt.

Clients want clearer information and added value, while firms juggle capacity, staffing, and tech changes. Is your firm ready for these new demands?

We created this newsletter for one reason: to help you confront these challenges with confidence and clarity.

CASNext® will be a practical, research-informed series packed with field-tested insights and actionable strategies you can bring directly to your firm’s conversations and client work.

Think of each edition as a working session—part mirror, part map—setting the stage for everything that follows. READ MORE →