Accounting & Finance: auditors must now check the client's AI

Accounting and finance now has US audit guidance on AI and a way to bill for checking it. Since Era Haus last looked in early September, the American Institute of Certified Public Accountants (AICPA), the US profession's body, published a practice aid for auditing companies that use AI and launched, with a startup, a paid assurance service for AI agents. AI also reached small-business clients through Meta and QuickBooks, and investors in Europe funded accounting run on AI. The shift: an auditor now has to check what a client's AI did to the books, and can bill for checking it.

The audit file now has an AI section

On 13 October 2026 the AICPA published "AI Considerations for Financial Statement Auditors," a practice aid (guidance, not a binding rule) in two parts, per the Journal of Accountancy. The first part covers a client that uses AI in its books: where the data came from, how the tool can be wrong without anyone noticing, and one point the institute states plainly, that a company using AI keeps full responsibility for its financial statements. The second covers the audit firm's own tools: they belong in the firm's quality-control policy, and the auditor still owns supervision, review and the conclusion. More questions and answers on audit evidence will follow, the institute says.

For a small US firm that audits or reviews company accounts (a review is a lighter check than an audit), this is the document a peer reviewer, the outside firm that inspects a practice's audit files every three years, will have read. For a finance team that uses AI in its month-end close, it means the auditor will ask what the tool did and who checked it.

A new service: checking a client's AI agents

Days later the AICPA announced a joint service with the Artificial Intelligence Underwriting Company (AIUC), a startup that wrote AIUC-1, a security and reliability standard for AI agents (Accounting Today, 19 October). One engagement, led by a certified accountant, produces two things: a SOC 2 report, the standard US attestation in which an accountant confirms that a service company's security controls work, and an AIUC-1 certification of the client's AI systems. It is in pilot, with full launch expected in early 2027, renewal every year and technical retesting every quarter. EisnerAmper, a large US accounting firm, says its specialists helped build it (EisnerAmper, 26 October).

That gives a firm already doing SOC 2 engagements a new line to offer companies that deploy agents. It also gives any business buying an AI tool a specific report to ask the vendor for. An existing SOC 2 report should not be assumed to cover AI risks, as one Pittsburgh accounting firm warned in its commentary on the launch.

The client's AI arrives through the client's own apps

On 29 September Meta launched Muse for Small Business, an assistant that connects to about 15 business apps, QuickBooks among them, in the US and Canada (Axios, 29 September). Owners can check cash flow and manage invoices from it; Meta says sending or spending anything still needs the owner's approval. At its conference in late October, Intuit, the maker of QuickBooks, put an agent that prepares the month-end close into beta testing for US firms (CPA Practice Advisor, 27 October). It has not published a price for the paid agent add-on.

In practice, US and Canadian clients will start sending numbers and summaries that an assistant pulled from their books. Ask where a figure came from before you rely on it.

Europe funds AI-run accounting, as firms and as software

In Germany, Integral, a Berlin company that sells accounting, tax and payroll services to small businesses with most of the routine done by its own AI, raised €18 million in a new funding round in September (Tech.eu). It is a direct competitor to the local tax advisor and bookkeeper. On the software side, Ravical, a Belgian company founded by the former chief executive of the accounting-software group Silverfin, raised $17 million in early-stage funding in late October (The Next Web). It says more than 100 European accounting firms use its tools. Both bets point the same way: in Europe the money is going to whoever does the routine bookkeeping with AI, whether that is a new firm or software sold to existing ones.

Staffing: UK plans, US actions

Deloitte's UK survey of 66 finance chiefs at large companies, published 13 October, found 52% expect AI to reduce their company's headcount over the next year (Accountancy Today). What large US companies say they have actually done is smaller. In a survey by Datarails, a finance software vendor, 3% of finance chiefs had cut finance staff where AI took over tasks, and 60% had moved those people to other jobs (Journal of Accountancy, October). The figures are the vendor's own, and the two surveys cover different countries.

What it means for you

Compliance: for audits of private US companies, the AICPA aid is now the reference an auditor will be measured against, though the institute calls it guidance only. Pricing: the US fee question is still open. As of 2 November the Internal Revenue Service had not answered the AICPA's September request to clarify its June language on passing AI savings to clients, the question set out in where the industry stands with AI. Staffing: where large companies replaced finance tasks with AI, most moved the people to other jobs.

What to do about it

Write one page on how your practice uses AI and how you check a client's AI, organized around the AICPA aid's two parts. A US peer reviewer, your insurer and a cautious client will each ask for it. If you already do SOC 2 engagements, ask the AICPA about the AIUC-1 pilot now. Everyone else: watch, and ask any AI vendor that touches client data which assurance report it holds.