To prevent fraud in a company, build a workplace where cheating has visible consequences, split financial duties so no single person controls a transaction from start to finish, lock down system access and monitor it, give employees a confidential way to report what they see, and audit on a schedule outsiders can’t predict. Those five layers reinforce each other. Any one of them alone is porous; together they close most of the gaps that embezzlement and billing schemes exploit.
Build a Culture Where Fraud Has Consequences
The strongest fraud deterrent isn’t software. It’s what employees genuinely believe will happen if someone cheats. When senior leaders prioritize integrity over quarterly numbers, employees absorb that standard. When leaders cut corners or look the other way for a top performer, employees absorb that too. There is no neutral position here.
Put the standard in writing. A code of conduct should spell out what’s off-limits: conflicts of interest, kickbacks, misuse of company resources, and falsifying records. Every employee should sign an acknowledgment, and the acknowledgment should be renewed annually so the document doesn’t gather dust. The SEC requires exactly this kind of written acknowledgment for investment adviser codes of ethics, and the practice translates well to any organization.1Securities and Exchange Commission. Investment Adviser Codes of Ethics
The code only matters if violations trigger consequences, applied the same way regardless of who is involved. The moment a senior executive gets a pass that a junior employee wouldn’t, the policy becomes decoration. Consistent enforcement is what separates a prevention program from a compliance binder.
Pair the code with training that targets the schemes most likely to hit your industry. Billing fraud for companies with large vendor networks. Payroll manipulation where the workforce is distributed. Expense reimbursement abuse where employees travel. Employees who can recognize a fake invoice or a ghost employee are worth far more than employees who sat through an hour of abstract ethics content.
Screen People Before You Trust Them
Verify candidates before they touch sensitive systems or financial data. Criminal history checks, employment history confirmation, and credit review for finance-related roles are baseline. FINRA rules require member firms to investigate an applicant’s character, business reputation, and qualifications before sponsoring them for registration, a standard worth borrowing even outside regulated industries.2FINRA. Regulatory Notice 15-05 – SEC Approves Consolidated FINRA Rule Regarding Background Checks on Registration Applicants
If you use a third-party screening service, the Fair Credit Reporting Act requires a clear written disclosure, in a standalone document containing nothing else, telling the candidate you intend to obtain a background report. You must also get the candidate’s written authorization before pulling the report.3Office of the Law Revision Counsel. 15 USC 1681b – Permissible Purposes of Consumer Reports Don’t bundle liability waivers or other unrelated language into the disclosure. Employers that violate these requirements face class-action exposure, which defeats the purpose of the screening.
Split Financial Duties So No One Person Owns a Transaction
Internal controls work on a simple principle: fraud that requires two people to collude is far harder to pull off than a solo act. Build your transaction processing so that no single person can authorize, execute, record, and review the same transaction.
Segregation of Duties
Split every financial process across at least two people. The employee who receives cash payments shouldn’t record those payments in the ledger. The person who approves vendor invoices shouldn’t have the ability to add new vendors to the system. When one person’s work automatically checks another’s, both honest errors and intentional manipulation surface faster. Small companies in particular tend to consolidate financial responsibilities in one or two trusted people, which is exactly the condition embezzlement thrives in.
Approval Thresholds and Purchase Orders
Set dollar thresholds that trigger additional approvals. A routine supply order might need one manager’s sign-off. A capital expenditure above a defined amount requires both a department head and the CFO. Approval has to happen before the commitment is made, not after the money is gone.
A purchase order system enforces this by creating a documented approval chain before any money changes hands. When an invoice arrives, accounts payable matches it against the original PO and a receiving report confirming the goods or services actually arrived. An invoice without a matching, pre-approved PO gets flagged and rejected. This three-way match is one of the most reliable defenses against billing fraud, and it’s achievable even for mid-sized companies.
Physical Assets and Company Credit Cards
Lock down tangible assets and financial instruments. Inventory belongs in secured, access-monitored facilities, with regular cycle counts to catch shrinkage before it compounds. Check stock belongs in a locked safe accessible only to authorized signers.
Company credit cards need individual spending limits and monthly reviews by a supervisor who isn’t the cardholder.4National Credit Union Administration. Examiners Guide – Corporate Credit Cards The reviewer should confirm every transaction is business-related and backed by a receipt. Personal purchases on corporate cards are among the most common low-level frauds, and they thrive wherever card statements go unreviewed.
Reconciliations and Vendor File Hygiene
Monthly bank reconciliations should be performed by someone who doesn’t handle cash, prepare deposits, or write checks. That independence is what makes the reconciliation meaningful. A reviewer with no reason to hide a discrepancy will catch unauthorized transactions, altered checks, and unrecorded withdrawals that the person handling the cash never would have flagged.
Scrub your vendor master file periodically. Look for duplicate vendor names, vendors sharing a mailing address with an employee, or multiple vendors using the same tax identification number. These are classic indicators of shell company schemes. A manager outside accounts payable should own the review, so the people who created the vendor records aren’t the ones checking them.
Lock Down Systems and Watch the Data
Technology automates the controls humans forget, skip, or override under deadline pressure. When your systems enforce the rules by default, you aren’t relying on everyone to follow the policy manual every time.
Least-Privilege Access and Multi-Factor Authentication
Apply the principle of least privilege: employees should access only the systems and data their specific role requires. A sales representative has no business viewing the accounts receivable ledger. A warehouse manager doesn’t need payroll access. Role-based restrictions prevent employees from wandering into areas where they could manipulate records undetected.
Multi-factor authentication should be mandatory for any system touching financial data or sensitive information. Federal banking regulators have issued interagency guidance recognizing that single-factor authentication is inadequate where risk assessments indicate elevated exposure.5Board of Governors of the Federal Reserve System. Authentication and Access to Financial Institution Services and Systems Interagency Guidance FINRA has mandated MFA for all active users logging into its systems.6FINRA. Multi-Factor Authentication A second verification step, whether a code from a phone app or a hardware token, makes unauthorized access dramatically harder.
Continuous Monitoring and Audit Logs
Monitoring tools analyze transaction patterns in real time and flag what periodic manual reviews miss: an unusually large payment to a new vendor, a transaction processed at 2 a.m., a series of purchases sitting just below the approval threshold. The real advantage is speed. The ACFE’s 2024 data shows a typical fraud case runs about 12 months before detection, and automated monitoring collapses that window.7Association of Certified Fraud Examiners. 2024 ACFE Report to the Nations
System logs recording who accessed what data and when create a reviewable trail. Employees who know their actions are logged and subject to independent review behave differently. Changes to critical system parameters, including approval thresholds, user permissions, and vendor records, should be logged automatically and reviewed by someone outside the team that made the changes. Baseline cybersecurity defenses, including encrypted data storage, current firewall protections, and periodic penetration testing by an independent firm, protect against external attackers who can manipulate financial systems just as effectively as insiders.
Give Employees a Safe Way to Report
Tips from employees are the single most effective fraud detection method, and the gap isn’t close. The ACFE’s 2024 data shows 43% of occupational fraud cases were uncovered through tips, more than three times the rate of any other detection method, and more than half of those tips came from employees.8Association of Certified Fraud Examiners. Occupational Fraud 2024: A Report to the Nations An organization without a trusted reporting channel is asking its best detection asset to stay quiet.
A third-party hotline available around the clock through multiple contact methods (phone, web portal, text) removes the fear that IT will trace the report or that a supervisor will recognize the caller’s voice. Internal-only reporting mechanisms tend to suppress information because employees worry about being identified. The investment in an external hotline service is modest compared to the cost of a scheme that runs unchecked for months because nobody felt safe reporting it.
Non-Retaliation Protections
A reporting channel without strong retaliation protections is a suggestion box nobody uses. Your non-retaliation policy should be explicit, communicated during onboarding and annual training, and backed by real consequences for anyone who retaliates against a reporter.
Federal law reinforces internal policies for public companies. The Sarbanes-Oxley Act prohibits companies with registered securities from retaliating against employees who report conduct they reasonably believe constitutes securities fraud, bank fraud, wire fraud, or violations of SEC rules. An employee who faces retaliation can file a complaint with OSHA within 180 days and, if successful, is entitled to reinstatement, back pay with interest, and reasonable attorney fees.9Office of the Law Revision Counsel. 18 USC 1514A – Civil Action to Protect Against Retaliation in Fraud Cases
The Dodd-Frank Act created a private right of action that lets whistleblowers sue their employer directly in federal court for retaliation. Successful claimants can recover double back pay with interest, reinstatement, and litigation costs.10Securities and Exchange Commission. Whistleblower Protections Beyond protection from retaliation, the SEC whistleblower program pays individuals who voluntarily provide original information leading to an enforcement action with sanctions over $1 million an award between 10% and 30% of the money collected.11Securities and Exchange Commission. Whistleblower Program That changes the math for an employee sitting on knowledge of a major fraud. Companies that take internal complaints seriously and investigate promptly often resolve problems before employees feel the need to go directly to regulators.
Handling a Report Once It Arrives
When a credible report comes in, secure the relevant evidence immediately. Electronic files, physical documents, system access logs, all of it before anyone involved can destroy or alter records. Assign the investigation to a team with no conflict of interest. If the allegation involves a senior manager, the team should report directly to the board’s audit committee, not to the manager’s peers.
Keep information limited to those with a direct need to know. Document every step: what evidence was collected, who was interviewed, what conclusions were reached, what actions were taken. If the matter escalates to law enforcement or regulators, that documentation becomes critical. A poorly documented internal investigation can make a company’s legal position worse, not better.
Audit on a Schedule People Can’t Predict
Scheduled audits catch problems. Surprise audits change behavior. ACFE data shows unannounced reviews are among the most effective fraud-reducing controls, yet fewer than a third of organizations use them. The logic is straightforward: if employees know an audit happens every December, they manage their exposure accordingly. If an audit can happen any Tuesday, the calculation shifts.
Build audit activity into your annual plan, but make part of it unpredictable. Unannounced reviews of high-risk areas, including cash handling, procurement, expense reimbursements, and vendor payments, send a stronger signal than a scheduled year-end review alone. External auditors bring an objectivity that internal teams struggle to match, especially when the people being audited have personal relationships with the reviewers.
Rules Worth Borrowing From Public-Company Requirements
Public companies face mandates that private companies would be wise to borrow from, even where not legally required. Under Sarbanes-Oxley, the CEO and CFO must personally certify the accuracy of financial reports and the effectiveness of internal controls in every annual and quarterly filing, and must disclose any material weaknesses to the auditors and audit committee.12Office of the Law Revision Counsel. 15 USC 7241 – Corporate Responsibility for Financial Reports Personal certification creates personal accountability. Executives who must sign their names to control assessments tend to pay closer attention to whether the controls actually work.
Section 404 of SOX requires management to assess and report on the effectiveness of internal controls over financial reporting each year.13Office of the Law Revision Counsel. 15 USC 7262 – Management Assessment of Internal Controls A similar annual self-assessment, even without the external attestation obligation, surfaces weaknesses before fraud exploits them.
Fidelity Bonds as a Financial Backstop
Even the best prevention program can’t stop every scheme. Fidelity bonds, sometimes called employee dishonesty insurance or commercial crime policies, reimburse losses caused by employee theft and fraud. They sit behind every procedural and technological control described above. They don’t prevent fraud, but they limit the financial damage when prevention fails. Small businesses in particular should treat this coverage as essential, because a single dishonest employee in a trusted position can inflict losses a small company simply cannot absorb.