Rising Audit Fees: Why They Keep Climbing and How Firms Protect Margins without cutting quality

Rising audit fees are now a permanent feature of the market on both sides of the Atlantic, and the cause is not greed at the top of the profession. It is arithmetic. The supply of qualified auditors is shrinking while the work demanded of every engagement keeps growing. In the US, the average public company paid a record $2.726 million in audit fees in FY2024, up 8% in a single year (Audit Analytics). In the UK, the Quoted Companies Alliance found audit fees up 127% across all markets over five years. Neither trend is reversing on its own.

If you run an audit firm, that climb cuts two ways. Higher fees should mean healthier margins, yet most firms are watching profitability erode because the cost of delivering each engagement is rising faster than they can reprice it. The scarce resource is people, and the way you staff to meet demand decides whether fee inflation lands as margin or as overtime. Below: why fees keep climbing in the US and UK, and how to keep the increases on your bottom line without trading away the quality a tougher regulator now demands.

Why rising audit fees keep climbing on both sides of the Atlantic

Audit fee inflation is the visible symptom of three forces working at once: a contracting talent pool, a heavier regulatory load, and engagements that are simply more complex than they were a decade ago. Scope now routinely stretches into IT systems, ESG disclosure, fair-value estimates, and digital assets that older audit programs never touched. Each force adds hours. Hours need people. People are exactly what the market is short of. The fee you charge has to absorb all of it, which is why the curve points one way.

The long view makes the trend impossible to dismiss as cyclical. US average audit fees have more than tripled in two decades, climbing from $681,000 in 2003 to $2.243 million in 2022, with Accounting Today attributing the growth to regulatory complexity and major new standards for revenue recognition and leases. Twenty years of one-directional movement is structural, not seasonal.

The US picture: record fees and a shrinking client base

The latest US data sets fresh records across the board. In FY2024, the average public company's total payments to its auditor rose to $3.26 million, a 9% increase on 2023, while the audit-fee component alone reached $2.726 million, up 8% from $2.516 million the year before (Audit Analytics). In aggregate, US public companies paid a record $21.675 billion in total fees to external auditors across the 6,656 companies in the analysis. More work, fewer filers, higher unit cost.

Concentration is part of the cost story. The Big Four took 69.5% of all SEC registrant audit-fee payments in FY2024, with PwC charging the highest average audit fee at $5.52 million per client (Audit Analytics). The largest companies feel the squeeze most acutely: large accelerated filers paid the steepest fees, averaging $6.06 million, a 5% rise on the prior year. When the firms with the deepest benches still charge that much, the message for everyone else is that capacity, not appetite, sets the price.

The UK picture: FRC scrutiny, FTSE 350 concentration, and the small-cap squeeze

The UK story rhymes with the US one but carries its own edge: a regulator pushing hard on quality and a market where the smallest listed companies feel the steepest pain. The Quoted Companies Alliance, in its report It Doesn't Add Up: The Crisis of Unaffordable Audits, found the average increase in UK audit fees across all markets over five years was 127%, with London Main Market companies up 149% and AIM companies up 110%. For Main Market companies with a market cap under £500m, fees rose roughly 75% over the five years to 2022, an average of about £547,000 extra per company (ICAEW, citing QCA).

At the top of the market the numbers are larger still, and they explain why challenger firms struggle to break in. Total public-interest-entity audit fees earned by UK firms reached £1.4 billion in 2023, a 27% increase on 2022, with 94% of that revenue coming from FTSE 350 audits (FRC). The Big Four still earned 98% of FTSE 350 audit fees in 2023, even as challenger firms nudged their share of FTSE 350 audit engagements up from 11% to 13% between 2022 and 2023 (ICAEW, citing FRC). Demand is concentrated, supply is concentrated, and price follows.

The talent shortage feeding cost into every engagement

Strip the fee debate back to its root and you find people, or the lack of them. More than 300,000 US accountants and auditors left the profession over two years, a roughly 17% decline from the 2019 peak (Fortune, citing WSJ, Bloomberg Tax, and BLS). When the experienced tier walks, the work does not shrink. It gets redistributed across a smaller, more expensive group, and the cost of every engagement rises with it. This is the audit staffing shortage in its rawest form.

The pipeline meant to refill that gap is also thinning. US accounting graduates fell to 55,152 in the 2023-24 academic year, a 6.6% drop, with master's degrees in accounting or taxation down about 15% and bachelor's degrees down 3.3% (Journal of Accountancy). New CPA-exam candidates tell the same story, falling sharply from 42,626 in 2023, the highest since 2016, to 28,082 in 2024. Fewer graduates and fewer newly qualified CPAs mean the supply crunch is locked in for years, not months, and that scarcity is priced straight into your fees.

Regulatory load and rising complexity

Even if talent were plentiful, the work itself now demands more hours per engagement. Regulators have raised the bar on evidence and documentation, and inspection results show how far there is to go. PCAOB inspections found 46% of US audit engagements reviewed in 2023 had at least one Part I.A deficiency, meaning insufficient evidence to support the audit opinion, a level Chair Erica Williams called unacceptable (PCAOB). A deficiency rate that high pushes firms to add review layers, expand testing, and document more, all of which add cost.

Scope has widened too. Modern engagements pull auditors into IT general controls, cybersecurity, ESG and sustainability disclosure, complex fair-value estimates, and digital-asset holdings. The new revenue-recognition and lease-accounting standards that Accounting Today flagged as fee drivers were only the start. Each new area requires specialist judgment and more senior time, the exact resource the talent shortage has made scarcest. Wider scope plus a shallower bench equals a higher cost base on every job.

Why surge staffing makes audit margin pressure worse

Faced with a fixed busy season and a thin permanent team, most firms reach for the obvious lever: surge staffing. They buy contract auditors, secondees, or temporary hires to get through the crunch, then release them when the wave passes. It feels like flexibility. On the margin line it usually behaves like a leak. Surge labour is bought at the worst possible moment, when every firm in the market wants the same people, so you pay peak rates for the privilege.

The hidden costs run deeper than the day rate. Temporary staff need onboarding into your methodology, your software, and each client's history every single season, so the same ramp-up cost is paid again and again. They carry no institutional memory, which means more partner and manager review time, the most expensive hours in the firm. Quality risk rises with unfamiliar hands on the file, and in a market where the PCAOB is already calling deficiency rates unacceptable, a rework cycle can wipe out the entire margin on an engagement. Surge staffing treats a permanent structural shortage as if it were a temporary spike. It is not.

Protecting margins without cutting quality: permanent dedicated capacity

If the shortage is permanent, the answer has to be permanent too. The firms protecting their margins are the ones replacing reactive surge staffing with a standing, dedicated audit team that learns their methodology once and keeps it. A dedicated team you work with season after season compounds in value: the onboarding cost is paid a single time, institutional knowledge accumulates, and the same reviewers see the same clients each year, which is exactly what drives both efficiency and quality.

Permanent dedicated capacity changes the economics in three concrete ways. You stop paying peak market rates for last-minute labour. You stop re-onboarding strangers every busy season. And you cut the partner review time that unfamiliar work demands, freeing your most expensive people for judgment and client relationships rather than re-checking basics. The fee increases the market hands you finally have somewhere to land, on your margin, instead of being spent before they arrive. None of this trades quality for cost. A consistent, trained team that knows the file is the same thing that satisfies a tougher regulator.

This is the model OpsFi's dedicated audit teams are built around: permanent, trained CA(SA) teams that integrate with your methodology and act as an extension of your firm, not a seasonal patch. Used as standing capacity rather than surge cover, the approach is how firms expand throughput without expanding their cost base at peak rates. The wider playbook, and the quality safeguards that have to come with it, sit in the audit talent crisis and dedicated offshore teams and in maintaining FRC and PCAOB compliance with offshore audit teams.

What this means for UK and US audit firms

Rising audit fees are not going to reverse. The talent shortage is locked in by a shrinking pipeline, the regulatory bar is rising, and engagement scope keeps widening. The firms that thrive will be the ones that stop treating a permanent shortage as a seasonal problem. Build standing, dedicated capacity that learns your methodology once and compounds in value, lean on AI to widen what gets tested while senior people own every conclusion, and reserve your scarcest reviewers for genuine judgment.

There is a wider lesson here that reaches past the audit firm itself. A weak finance function quietly drains a company today through poor collections, working-capital drag, and thin margin visibility, then destroys value tomorrow when the books hit serious scrutiny: a restated number, a broken deal, a failed approval. The same logic applies to how you run the audit. Getting the structure right while the pressure is merely uncomfortable is far cheaper than fixing it after a deficiency finding or a margin collapse forces your hand. The capacity decision you make now is the one that protects both your quality and your profit when the next busy season arrives. A faster, cleaner month-end close on the client side makes that capacity go even further.