Can an AI agent review and audit your expense reports?

Can an AI agent do expense audit?

Yes for the checking, no for the verdict. An AI agent for expense audit can read every receipt, compare each expense and card charge with your written policy, flag duplicates and odd receipts, and approve clearly in-policy spend below limits you set. Agents do this in production today. AppZen reports that Databricks runs about 136,000 expense audits a year through its AI, with 72% of expense reports auto-approved and nearly 3,000 auditor hours saved a year. Ramp says early customers of its Policy Agent cut manual reviews by about 85% with 99%+ accuracy. Both figures come from the vendors, and neither states how it was measured.

What stays with people is anything that accuses or charges an employee: rejecting a claim, asking for money back, opening a fraud case. Ramp's documentation says reviewers always keep final authority. Treat this as a supervised hire.

This page covers employee expense reports and card transactions. Supplier invoices are a separate job: see accounts payable.

What the agent does and what stays with you

Agent

5of 11

• Read receipt contents and flag amount mismatches for review
• Flag duplicate and reused receipts across reports and card charges
• Auto-approve clearly in-policy expenses below limits you set
• Request missing expense documentation
• Report policy violations and spend patterns

Agent with review

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• Check each expense against the written expense policy
• Flag suspicious or AI-generated receipts and anomalous spend

Human

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• Reject expenses, request repayment and handle disputes
• Investigate suspected expense fraud
• Track substantiation deadlines and unreturned advances under your reimbursement plan
• Change the expense policy

The split follows one rule: the agent checks evidence and applies written rules; a person makes any decision about an employee's honesty or money owed back. Each of the three products cited here pairs automated checks with human review, in different ways. Ramp's agent gives one of three answers (approval recommended, requires review, rejection recommended) and cites the policy text behind each; when the policy or the submission is ambiguous, it marks the expense for review rather than approving it. Brex flags expenses from risk rules and a machine learning model, for example a reimbursement claimed for more than the receipt shows, and says a flag does not mean the employee acted maliciously. AppZen goes further and says its agents can auto-reject, request documentation, route to an approver or auto-approve, with people stepping in for exceptions. On this page, rejection stays with a person: that is our recommendation, not a limit of every product.

One boundary is easy to miss. Ramp states that its Policy Agent does not check whether accounting codes or GL coding are correct. If you also want coding reviewed, treat it as a separate check; see bookkeeping and reconciliation and month-end close.

A worked example: one dinner expense

This is an illustration, not a customer story. Assume, for this example, that your policy caps client dinners at $65 per person and requires a receipt and attendee names.

An employee submits a $212 dinner with a receipt and three attendees. The agent reads the receipt and finds the amount matches the claim. It checks for the same receipt on other reports and finds none. It divides $212 by three attendees, gets $70.67 per person, and compares that with the $65 cap. It marks the expense "requires review" and cites the dinner rule, noting that the overage is $17 in total ($212 − 3 × $65).

The employee's manager opens the expense, sees the cited rule and the arithmetic, and approves it as an exception because the client was a priority account. The exception and the reason go into the expense's activity log. Had the receipt been for $150 while the claim said $212, the mismatch would have gone to the finance reviewer instead, and a person, not the agent, would decide what to ask the employee.

What you need to provide

The agent touches personal data (names, travel, sometimes spending that hints at health or family) and financial data (card numbers in part, amounts, reimbursements). Ramp says its agent reads transaction data, receipts, memos, attendees, trip details and employee fields such as department and role, and does not see personal bank accounts. Give it the least access that does the job:

• Your expense policy as plain text. Ramp recommends about 10 pages or 10,000 words at most and says its agent cannot read images or hyperlinks, so any rule that lives in a table image or a linked page has to be written out.
• A role in the expense system that can recommend and approve within limits, but cannot reject, request repayment or pay.
• The employee attributes your rules depend on (department, level, entity, office).
• Written auto-approval limits. Ramp lets you restrict auto-approval by amount, spend program, department, role or merchant, and send everything else to people.
• A named reviewer for each queue.

Job brief template

Use this as the brief for a vendor, an operator or an internal team setting up the agent. Replace the bracketed values with your own.

The acceptance criteria are what make the brief usable. A 100-expense sample judged by your finance owner, and a few planted duplicates, tell you more than any vendor accuracy figure.

What it costs

We have left out a cost comparison because the agent side cannot be stated fully. Ramp lists its Plus plan, which includes AI-driven expense reviews, at $15 per user per month plus a platform fee based on team size that the pricing page does not state. AppZen offers demos and publishes no prices. Price your own case on the units vendors quote (per user, per report or per line) and add the reviewer time the trial measures.

Risks and human checkpoints

The fraud numbers explain why the checkpoints stay. In the ACFE's 2026 Report to the Nations, based on 2,402 occupational fraud cases investigated between January 2024 and September 2025 and reported by Certified Fraud Examiners in a 2025 survey, expense reimbursement schemes appeared in 13% of cases, with a median loss of $36,000, and lasted a median 18 months before detection. That is slow, small-dollar fraud, the kind a reviewer who sees every report could catch earlier. It is also the kind where a wrong accusation damages trust, which is why the agent flags and a person decides.

There is a tax side as well. IRS Publication 463 says that to count as an accountable plan, reimbursements need a business connection, adequate accounting within a reasonable period, and return of any excess. It treats accounting within 60 days and returning excess within 120 days as reasonable, and reimbursements outside the plan's rules are generally treated as paid under a nonaccountable plan and reported as wages. It also says documentary evidence is generally not required for an expense other than lodging under $75. Whether these rules apply to your plan is a question for your tax adviser; the agent's job is only to surface late or missing substantiation.

How to run a trial

Run the agent next to your current review for one month before letting it approve anything.

1. Turn on recommendations only. Ramp's own testing advice is to keep the agent's recommendations visible to admins only and to make sure test expenses still go to a human reviewer.
2. Each week, take 100 expenses and compare the agent's call with your finance owner's. Count disagreements against the brief's 95-of-100 bar.
3. Plant five test cases: a reused receipt, a receipt that does not match the claim, a split purchase under a limit, a missing attendee list and one clearly fine expense. Note which the agent catches.
4. Log every flag reviewers dismiss. A rule that drives most dismissals needs rewriting, not a stricter agent.
5. Time your reviewers. Minutes per flagged expense decide whether the agent saves money.
6. After two clean weeks, allow auto-approval for one low-risk category under a low limit and widen it from there.

1. 1

   Turn on recommendations only

   Keep them visible to admins only and make sure test expenses still go to a human reviewer

2. 2

   Each week, compare 100 expenses

   The agent's call against your finance owner's; count disagreements against the brief's 95-of-100 bar

3. 3

   Plant five test cases

   A reused receipt, a receipt that does not match the claim, a split purchase under a limit, a missing attendee list and one clearly fine expense

4. 4

   Log every flag reviewers dismiss

   A rule that drives most dismissals needs rewriting, not a stricter agent

5. 5

   Time your reviewers

   Minutes per flagged expense decide whether the agent saves money

6. 6

   After two clean weeks, allow auto-approval

   For one low-risk category under a low limit, then widen it from there

For structuring the test, see how to run a paid trial with an AI agent, and for the brief, how to write a job description for an AI agent. Related: the accounts payable clerk and bookkeeper roles, and the finance overview.

This page is not financial, tax or accounting advice.

Sources

1. 1
   Policy Agent Overview

   Ramp Help CenterPrimaryAccessed Nov 14, 2026

2. 2
   Use Policy Agent for approvals

   Ramp Help CenterPrimaryAccessed Nov 14, 2026

3. 3
   Flagged expenses

   Brex Help CenterPrimaryAccessed Nov 14, 2026

4. 4
   AI Expense Audit Software

   AppZenVendorAccessed Nov 14, 2026

5. 5
   Databricks enhances T&E control with AI automation

   AppZenVendorAccessed Nov 14, 2026

6. 6
   Ramp Pricing and Plans

   RampVendorAccessed Nov 14, 2026

7. 7
   Publication 463 (2025), Travel, Gift, and Car Expenses

   Internal Revenue ServicePrimaryAccessed Nov 14, 2026

8. 8
   Occupational Fraud 2026: A Report to the Nations

   Association of Certified Fraud ExaminersPressAccessed Nov 14, 2026