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Art of Accounting: Top 100 10-year comparison

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Enjoy complimentary access to top ideas and insights — selected by our editors.

Public accounting is a growing profession. The growth from 2015 to 2025 in revenues was 125% and in total personnel 113%. These are real numbers and vitiate what the naysayers claim about the doom and gloom of the profession.

Last week I provided an analysis of the Top 100 numbers that appeared in the March 2025 issue. What I did was actually simple and was typical of what I do for clients and teach my students. Rather than accepting the aggregate numbers, I look beneath them. In this situation I did a few things. I broke the total amounts into three groups based on revenues and used that to analyze the relative performance of the three groups, and I think I came up with some reasonable conclusions. You can look at last week’s issue to see what they were.

This week I looked at the changes over the last 10 years and will discuss some of my observations here. The revenue growth was impressive, but it came primarily from the group of 12 and then the other 84, with the lowest percentage increase from the Big Four. Also the growth of employees was the lowest for the Big Four and greatest for the group of 12. To see what this means, I looked at the revenue per employee. The Big Four’s revenue per employee was virtually flat, indicating no growth, which I translate as stagnant efficiency or effectiveness. That would seem to retard profit growth. Running a business with a growing top line and presumably a large growth in technology usage but flat revenues per employee does not make sense. 

Top 100 Firms – 2025 compared to 2015 selected data
Data from Accounting Today 2025 and 2015 Top 100 Firms issues
Data compiled by Edward Mendlowitz, CPA
Partner %
$ revenues Total to total
2025 millions Offices Partners employees employees
Big Four 91,046 389 17,172 352,620 4.87%
Next 12 23,918 718 8,309 95,374 8.71%
Remaining 84 16,165 1,043 7,578 70,914 10.69%
Total 131,130 2,150 33,059 518,908 6.37%
% of Big Four to total 69.43% 18.09% 51.94% 67.95%
% of Next 12 to total 18.24% 33.40% 25.13% 18.38%
% of Other 84 to total 12.33% 48.51% 22.92% 13.67%
2015
Big Four 43,402 360 10,234 167,557 6.11%
Next 12 8,315 491 3,786 40,201 9.42%
Remaining 84 6,519 626 3,749 35,331 10.61%
Total 58,236 1,477 17,769 243,089 7.31%
% of Big Four to total 74.53% 24.37% 57.59% 68.93%
% of Next 12 to total 14.28% 33.24% 21.31% 16.54%
% of Other 84 to total 11.19% 42.38% 21.10% 14.53%
10-year change
Big Four 47,644 29 6,938 185,063 -1.24%
Next 12 15,603 227 4,523 55,173 -0.71%
Remaining 84 9,646 417 3,829 35,583 0.08%
Total 72,893 673 15,290 275,819 -0.94%
% of Big Four to total 109.77% 8.06% 67.79% 110.45%
% of Next 12 to total 187.65% 46.23% 119.47% 137.24%
% of Other 84 to total 147.96% 66.61% 102.13% 100.71%
% of Total change 125.17% 45.57% 86.05% 113.46%
2025 Percentages of services
A&A Tax MAS/Other
Big Four 28.50% 24.00% 47.75%
Next 12 33.50% 35.67% 30.75%
Remaining 84 30.25% 37.17% 32.58%
2015
Big Four 35.00% 25.75% 39.25%
Next 12 42.67% 31.92% 25.42%
Remaining 84 38.23% 35.13% 26.64%
10-year change
Big Four -6.50% -1.75% 8.50%
Next 12 -9.17% 3.75% 5.33%
Remaining 84 -7.98% 2.04% 5.95%
Revenue Revenue
per per
2025 partner employee
Big Four 5,302,003 258,199
Next 12 2,878,609 250,785
Remaining 84 2,133,179 227,955
Total 3,966,532 252,703
2015
Big Four 4,240,962 259,028
Next 12 2,196,241 206,835
Remaining 84 1,738,968 184,523
Total 3,277,413 239,568
10-year change
Big Four 1,061,042 -830
Next 12 682,367 43,950
Remaining 84 394,211 43,432

However, there was significant growth in revenues per employee in the other groups. I did not use percentages, but dollars of growth. Both of the other groups had similar growth of about $43,000 annual revenue per employee. Looking at the overall total of $13,000 per employee does not provide any insights other than macro growth for the Top 100. If I were managing a Big Four firm, I would seriously look at this. I did not look at each of the Big Four separately. I could have but do not want to make a career out of this as my aim is to provide insights and comparative data to readers. 

Another thing I want to point out is a reiteration of what I wrote last week about the MAS grouping of the Group of 12 being closer to the remaining 84 than the Big Four. Looking at this from 2015 indicates that the MAS group grew similarly to the two smaller groups, while the Big Four grew significantly. Also the A&A for all three declined as a percentage of revenues, while the taxes grew for the group of 12.

I also want to point out that using aggregate data doesn’t usually provide the information clients need. And my “teaching” self wants to inject a lesson here that what I did here can be done for every one of your clients. I do it, and so can you.

A final observation. Last week I provided the average revenues and staffing of the bottom five firms. That was 64.5 million revenues and 312 total employees. Ten years ago, these were $33.2 million and 201 total employees. Revenues almost doubled and headcount grew 50%. This indicates growth with much more efficiency and effectiveness or better pricing. The revenue growth was below each of the three groups, but the lower headcount growth is very impressive. Better numbers could be obtained by segmenting into more groups. Do that if you want. This is a column for accountants with the purpose of providing a method of looking at data more effectively. When I advise my clients, I work out the right data to advise them with. One suggestion for those running an accounting practice in the Top 100 is to look at the five firms above and below you and see how you are doing. Then look further above and consider setting that as a goal.

There is a lot more to do. There always is a lot more to do. Use this and last week’s charts and the Top 100 list and figure out what works for you. Use my process to look beyond the primary chart and come up with helpful observations. And this process should be applied to your business clients.

Do not hesitate to contact me at [email protected] with your practice management questions or about engagements you might not be able to perform. 

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Accounting

Accounting firms seeing increased profits

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Accounting firms are reporting bigger profits and more clients, according to a new report.

The report, released Monday by Xero, found that nearly three-quarters (73%) of firms reported increased profits over the past year and 56% added new clients thanks to operational efficiency and expanded service offerings.

Some 85% of firms now offer client advisory services, a big spike from 41% in 2023, indicating a strategic shift toward delivering forward-looking financial guidance that clients increasingly expect.

AI adoption is also reshaping the profession, with 80% of firms confident it will positively affect their practice. Currently, the most common use cases for AI include: delivering faster and more responsive client services (33%), enhancing accuracy by reducing bookkeeping and accounting errors (33%), and streamlining workflows through the automation of routine tasks (32%).

“The widespread adoption of AI has been a turning point for the accounting profession, giving accountants an opportunity to scale their impact and take on a more strategic advisory role,” said Ben Richmond, managing director, North America, at Xero, in a statement. “The real value lies not just in working more efficiently, but working smarter, freeing up time to elevate the human element of the profession and in turn, strengthen client relationships.”

Some of the main challenges faced by firms include economic uncertainty (38%), mastering AI (36%) and rising client expectations for strategic advice (35%). 

While 85% of firms have embraced cloud platforms, a sizable number still lag behind, missing out on benefits such as easier data access from anywhere (40%) and enhanced security (36%).

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Accounting

Private equity is investing in accounting: What does that mean for the future of the business?

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Private equity firms have bought five of the top 26 accounting firms in the past three years as they mount a concerted strategy to reshape the industry. 

The trend should not come as a surprise. It’s one we’ve seen play out in several industries from health care to insurance, where a combination of low-risk, recurring revenue, scalability and an aging population of owners create a target-rich environment. For small to midsized accounting firms, the trend is exacerbated by a technological revolution that’s truly transforming the way accounting work is done, and a growing talent crisis that is threatening tried-and-true business models.

How will this type of consolidation affect the accounting business, and what do firms and their clients need to be on the lookout for as the marketplace evolves?

Assessing the opportunity… and the risk

First and foremost, accounting firm owners need to be aware of just how desirable they are right now. While there has been some buzz in the industry about the growing presence of private equity firms, most of the activity to date has focused on larger, privately held firms. In fact, when we recently asked tax professionals about their exposure to private equity funding in our 2025 State of Tax Professionals Report, we found that just 5% of firms have actually inked a deal and only 11% said they are planning to look, or are currently looking, for a deal with a private equity firm. Another 8% said they are open to discussion. On the one hand, that’s almost a quarter of firms feeling open to private equity investments in some way. But the lion’s share of respondents —  87% — said they were not interested.

Recent private equity deal volume suggests that the holdouts might change their minds when they have a real offer on the table. According to S&P Global, private equity and venture capital-backed deal value in the accounting, auditing and taxation services sector reached more than $6.3 billion in 2024, the highest level since 2015, and the trend shows no signs of slowing. Firm owners would be wise to start watching this trend to see how it might affect their businesses — whether they are interested in selling or not.

Focus on tech and efficiencies of scale

The reason this trend is so important to everyone in the industry right now is that the private equity firms entering this space are not trying to become accountants. They are looking for profitable exits. And they will do that by seizing on a critical inflection point in the industry that’s making it possible to scale accounting firms more rapidly than ever before by leveraging technology to deliver a much wider range of services at a much lower cost. So, whether your firm is interested in partnering with private equity or dead set on going it alone, the hyperscaling that’s happening throughout the industry will affect you one way or another.

Private equity thrives in fragmented businesses where the ability to roll up companies with complementary skill sets and specialized services creates an outsized growth opportunity. Andrew Dodson, managing partner at Parthenon Capital, recently commented after his firm took a stake in the tax and advisory firm Cherry Bekaert, “We think that for firms to thrive, they need to make investments in people and technology, and, obviously, regulatory adherence, to really differentiate themselves in the market. And that’s going to require scale and capital to do it. That’s what gets us excited.”

Over time, this could reshape the industry’s market dynamics by creating the accounting firm equivalent of the Traveling Wilburys — supergroups capable of delivering a wide range of specialized services that smaller, more narrowly focused firms could never previously deliver. It could also put downward pressure on pricing as these larger, platform-style firms start finding economies of scale to deliver services more cost-effectively.

The technology factor

The great equalizer in all of this is technology. Consistently, when I speak to tax professionals actively working in the market today, their top priorities are increased efficiency, growth and talent. Firms recognize they need to streamline workflows and processes through more effective use of technology, and they are investing heavily in AI, automation and data analytics capabilities to do that. Private equity firms, of course, are also investing in tech as they assemble their tax and accounting dream teams, in many cases raising the bar for the industry.

The question is: Can independent firms leverage technology fast enough to keep up with their deep-pocketed competition?

Many firms believe they can, with some even going so far as to publicly declare their independence.  Regardless of the path small to midsized firms take to get there, technology-enabled growth is going to play a key role in the future of the industry. Market dynamics that have been unfolding for the last decade have been accelerated with the introduction of serious investors, and everyone in the industry — large and small — is going to need to up their games to stay competitive.

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Accounting

Trump tax bill would help the richest, hurt the poorest, CBO says

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The House-passed version of President Donald Trump’s massive tax and spending bill would deliver a financial blow to the poorest Americans but be a boon for higher-income households, according to a new analysis from the Congressional Budget Office.

The bottom 10% of households would lose an average of about $1,600 in resources per year, amounting to a 3.9% cut in their income, according to the analysis released Thursday. Those decreases are largely attributable to cuts in the Medicaid health insurance program and food aid through the Supplemental Nutrition Assistance Program.

Households in the highest 10% of incomes would see an average $12,000 boost in resources, amounting to a 2.3% increase in their incomes. Those increases are mainly attributable to reductions in taxes owed, according to the report from the nonpartisan CBO.

Households in the middle of the income distribution would see an increase in resources of $500 to $1,000, or between 0.5% and 0.8% of their income. 

The projections are based on the version of the tax legislation that House Republicans passed last month, which includes much of Trump’s economic agenda. The bill would extend tax cuts passed under Trump in 2017 otherwise due to expire at the end of the year and create several new tax breaks. It also imposes new changes to the Medicaid and SNAP programs in an effort to cut spending.

Overall, the legislation would add $2.4 trillion to US deficits over the next 10 years, not accounting for dynamic effects, the CBO previously forecast.

The Senate is considering changes to the legislation including efforts by some Republican senators to scale back cuts to Medicaid.

The projected loss of safety-net resources for low-income families come against the backdrop of higher tariffs, which economists have warned would also disproportionately impact lower-income families. While recent inflation data has shown limited impact from the import duties so far, low-income families tend to spend a larger portion of their income on necessities, such as food, so price increases hit them harder.

The House-passed bill requires that able-bodied individuals without dependents document at least 80 hours of “community engagement” a month, including working a job or participating in an educational program to qualify for Medicaid. It also includes increased costs for health care for enrollees, among other provisions.

More older adults also would have to prove they are working to continue to receive SNAP benefits, also known as food stamps. The legislation helps pay for tax cuts by raising the age for which able bodied adults must work to receive benefits to 64, up from 54. Under the current law, some parents with dependent children under age 18 are exempt from work requirements, but the bill lowers the age for the exemption for dependent children to 7 years old. 

The legislation also shifts a portion of the cost for federal food aid onto state governments.

CBO previously estimated that the expanded work requirements on SNAP would reduce participation in the program by roughly 3.2 million people, and more could lose or face a reduction in benefits due to other changes to the program. A separate analysis from the organization found that 7.8 million people would lose health insurance because of the changes to Medicaid.

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