Your review layer isn't overhead. In audit offices, thinner review went with more errors.

You are looking at next year's headcount plan. Revenue is up, the delivery team needs more hands, and the line you keep circling is the cheapest one to cut: the extra manager whose job is mostly reading other people's work before it leaves the building. The question is whether that line is cost or protection.

A paper in Contemporary Accounting Research bears on that, and it deserves a careful reading because it comes from a narrow setting. The title is "Staffing Leverage at the Audit Office and Audit Quality." The authors are Joshua A. Khavis and Brandon Szerwo, both at the University at Buffalo, and Mengtian Li at the University of North Carolina at Greensboro. Crossref lists the paper as published online on August 25, 2026. I learned about it this month through a Phys.org write-up of the University at Buffalo's news release, dated October 12. The paywall kept me from the full paper, so everything here comes from the published abstract and that coverage. I have marked which is which.

The method, from the abstract: the authors measured "staffing leverage" as an office's ratio of audit partners and managers to audit employees, then tested it against audit outcomes from 2008 to 2022. The sample size comes from the Phys.org coverage, not the abstract: more than 41,000 audits of more than 5,700 companies at 20 large U.S. accounting firms, with employment data from Revelio Labs. This is an observational study of existing offices. Nobody assigned managers to offices at random.

We find staffing leverage is associated with lower rates of client misstatements, comment letters, and PCAOB inspection deficiencies, suggesting higher audit quality.

— Khavis, Li and Szerwo, abstract of the paper, as published by Crossref

The abstract adds several qualifiers, and they matter. The association held for both partners and nonpartner managers when the authors split them out. It was stronger for more complex clients and for offices with better management. The authors also measured leverage at the firm level, where it predicted audit quality too, but the firm-level association was statistically detected only within Big 4 audits. The Phys.org coverage describes the stronger-with-better-management result as offices where employees reported higher satisfaction with senior management. I could not check that wording against the paper.

The coverage also quotes Khavis: "Effective oversight is not limited to the most senior people in an organization." That is his reading of the result as reported there, and it is a reasonable one. The abstract words its findings as associations, and the Phys.org headline says the staffing structure improves outcomes. I did not see the authors discuss causation, and I cannot say what the full paper says.

Why this lands differently for the person at the top than for anyone else in the building. A staff member sees review as a delay between finishing and shipping. A manager sees it as a job competing with their own deliverables. You are the only person who sees the whole budget and also carries the consequence when something wrong goes out under your name. Review time never shows up as revenue, so it looks like slack on a spreadsheet. The mistakes it catches never show up at all. That asymmetry means the review layer is the first thing a growing company thins out, and nobody objects, because nothing visibly breaks that quarter.

The part the research doesn't say, but that I'll say plainly: audit is not your business. Auditing has formal review requirements and regulators watching, and a company like yours doing something else may have a very different relationship between review and quality. The study cannot tell you that adding a manager will reduce your errors. Offices with more partners and managers may differ in ways the abstract does not capture, and those cautions are mine, not the authors'. What I take from it is narrower: the claim that review capacity is wasted money has a real counter-example in 20 large firms over 15 years, and the gain showed up where the work was most complex and the management was better. If the manager is poor, adding one is probably not the answer the data supports.

One thing to do this week. Pick the last three pieces of work that went to a customer with a mistake in them. For each, write down who reviewed it, how long they had, and what else was on their plate that day. If the answer is "no one" or "ten minutes between other jobs," you have found where your oversight is thin, and you can decide with real cases in front of you whether to protect that time before you cut the line.

Whether your managers have the standing and the bandwidth to review well is a question about how they are wired to the work, not just how many of them you employ. The Leadership Profile maps how you hand off and check work. Start at the Wiring Map.