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There is a version of the AI conversation that treats the whole thing as speculative -- interesting in theory, unproven in practice, worth watching but not yet worth acting on. That version is no longer accurate. According to the Thomson Reuters Future of Professionals Report 2025, more than half of accounting and professional services firms are already seeing measurable returns on investment from their use of AI. Not projected ROI. Not anticipated ROI. Current, documented, showing-up-in-the-numbers ROI. The question for firm leadership is no longer whether AI produces results. It is why some firms are capturing those results, and others are not.
Where the Returns Are Actually Showing Up
The Thomson Reuters data identifies four categories in which AI ROI is materializing across accounting and professional services firms: working faster, working better, talent outcomes, and top- and bottom-line impact. Each one represents a different entry point, and most firms are seeing returns in more than one area simultaneously.
The fastest and most widely reported gains are operational. Firms describe improved efficiency, faster client response times, and meaningful reductions in errors. These are the efficiency wins that most people expected AI to deliver, and the data confirms they are real. Legal professionals surveyed expect to free up nearly 240 hours per year per professional as a result of AI -- up from 200 hours in 2024. That translates to an average annual value of approximately $19,000 per professional. Across the US legal, tax, and accounting sectors, the projected annual impact totals $32 billion.
The quality gains are less discussed but equally significant. Firms report that AI is improving client communication, increasing accuracy, enabling more advanced analytics, and supporting better risk mitigation. These are not efficiency metrics. They are service quality metrics, and they are the kind of improvements that clients notice.
The Talent Story Nobody Expected
The ROI category that surprises most firm leaders is talent. AI is showing measurable benefits in work-life balance, skill-building, and the firm's ability to attract and retain high-quality professionals. This connection is less intuitive than time savings, but the logic is straightforward: when AI removes the most repetitive and administrative layers of accounting work, the people doing that work get their time back. They spend more of their day on the work that actually requires their expertise. That is a better job, and people stay in better jobs.
The retention dimension matters particularly now, when competition for skilled accounting professionals is intense, and the talent pressures facing accounting firms are not expected to ease. Firms that can credibly tell candidates they use AI to eliminate low-value work -- not to eliminate headcount -- hold a real recruiting advantage. The Thomson Reuters report notes that many professionals are actively seeking out organizations that encourage the use of advanced technology. Firms that have built that culture are not just more productive. They are more attractive.
Why Some Firms Are Seeing It and Others Are Not
The 53% figure is significant, but the more instructive number is the gap between that group and the 47% who aren't yet seeing returns. The Thomson Reuters data is consistent across every cut of the research: strategy is the variable that matters most.
Firms with no significant AI adoption plans report an ROI of 23%. Firms with a visible, documented AI strategy report ROI at 81%. That gap is not explained by the sophistication of the tools being used or the size of the firm's technology budget. It is explained by whether the firm made a deliberate decision about what it was trying to accomplish with AI and then organized itself around that decision.
The report describes four layers required to move from investment to return: a clear organizational strategy, visible leadership behavior, operational adjustments to workflows and service delivery, and individual adoption with personal accountability. Firms that have engaged all four layers consistently outperform those that have engaged one or two. The layer most commonly skipped is the last one—firms build a strategy and assume adoption will follow. It does not, without individual goal-setting and accountability structures that connect firm-level intent to daily professional behavior.
The Accuracy Question Is Part of the ROI Picture
One finding in the Thomson Reuters report reframes how firms should think about AI ROI in a compliance-heavy profession. Ninety-one percent of accounting and professional services professionals believe AI outputs should be held to higher accuracy standards than human work. 41% say AI-generated outputs must be fully accurate before they can be used without human review.
This is not resistance to AI. It is a matter of professional judgment, and it is the right standard for a profession where errors have regulatory and legal consequences. But it also has direct implications for ROI. Firms that deploy AI without building in adequate human review are not just taking on risk -- they are undermining the quality gains that make AI valuable in the first place. The ROI from AI in accounting is not purely about speed. It is about speed combined with accuracy, and accuracy requires human oversight at the review stage.
Firms that build that review into their workflows, rather than treating it as friction, are the ones the data identifies as seeing the broadest and most durable returns. For firms considering how to communicate their AI capabilities to clients, the human oversight aspect is not a weakness to minimize. It is a differentiator worth leading with.
The Window for Early Mover Advantage Is Still Open
Technology adoption in public accounting shows that firms that capture an early advantage in major technology shifts tend to hold on to it. The cost-structure advantages, client-experience improvements, and talent outcomes that come from early, strategic AI adoption compound over time, making it increasingly difficult for slower-moving firms to close the gap.
Fifty-three percent of firms are already in the game. The gains they are banking now -- in time recaptured, errors reduced, talent retained, and revenue grown -- are being reinvested into the next round of improvements. The firms not yet seeing ROI are not standing still while they wait. They are falling further behind firms that started earlier and are already on their second or third iteration of a working AI strategy.
What Seeing ROI Actually Takes
More than half of accounting and professional services firms are already seeing returns on their AI investments. The ones seeing the most are not necessarily the ones with the biggest technology budgets. They are the ones with a visible strategy, leadership that models adoption, workflows designed around AI capabilities, and professionals with individual accountability for their own AI proficiency.
At Winsome Marketing, we help accounting firms build the content and authority that position them as the strategic, forward-thinking practices clients are looking for. If your firm is building something worth talking about, let's talk.