Business credit card fraud: Types and how to stop it

Business credit card fraud can cost your company more than just money; it takes up valuable time, disrupts business operations, and exposes sensitive financial data. Whether it happens due to stolen card details, fake vendors, account takeovers, or unauthorized employee purchases, it can be a major drain on your business.

In this guide, we'll explore how to spot, prevent, and report business credit card fraud.

What is business credit card fraud?

Business credit card fraud is the unauthorized use of a company credit card or card number. This can include external threats, such as stolen card details, or internal misuse, such as employees spending outside of policy. In both cases, your company pays for charges it didn't approve.

Business credit card fraud isn't always immediately apparent. It might be a fake vendor charging small amounts that slip through unnoticed. It could be a former employee using a card that was never deactivated. It can even happen when someone manipulates expense receipts or descriptions to cover up misuse.

Unlike personal credit card fraud, which usually affects one bank account, business card fraud can spread across departments and multiple users. It creates gaps in your books, delays reporting, and adds hours of work during your month-end close.

Businesses are particularly vulnerable because corporate cards often have higher spending limits, are used by multiple employees, and may be shared across departments or teams. Without proper controls in place, unauthorized spending can go unnoticed until it creates significant financial or compliance issues.

Business credit card fraud vs. personal credit card fraud

Business and personal credit card fraud may share tactics like stolen card numbers or phishing, but their scope and impact are very different. Business fraud typically involves more users, less direct oversight, and greater financial exposure, which makes it harder to detect and control.

Here's a side-by-side comparison of business vs. personal credit card fraud:

These differences matter because business cards lack the automatic legal protection personal cards get under the FCBA. When it comes to credit card fraud, business owners carry more of the risk, so prevention and controls do the heavy lifting that legal protection won't.

Who is liable for business credit card fraud?

When a business card is used fraudulently, who pays depends on your card issuer's cardholder agreement and zero-liability policy, not federal law. Business cards aren't covered by the Fair Credit Billing Act the way personal cards are, so there's no guaranteed $50 liability cap to fall back on.

• Who pays: Liability falls to your business unless your issuer's zero-liability policy covers the charge. Terms vary by issuer, so your cardholder agreement decides how much you can recover.
• Who investigates: Your card issuer handles most disputes. Local police or the FTC typically get involved only for large losses, organized schemes, or identity theft.
• What this means for you: Because legal protection isn't guaranteed, internal controls are your real safety net. Prevention, not recovery, is what limits the damage.

What are the signs of business credit card fraud?

Fraud doesn't always appear as a large, suspicious charge. It often starts small or blends in with normal spending patterns, which is why knowing how to protect against credit card fraud starts with recognizing the red flags. Watch for three patterns:

• Unusual patterns: Charges that fall outside your corporate credit card policy, sudden high-value transactions that don't match an employee's role, or purchases from unfamiliar vendors, locations, or at odd hours
• Testing charges: Multiple small purchases in a short window, a tactic fraudsters use to check whether a card is active without drawing attention
• Documentation issues: Missing receipts, vague expense descriptions, or transactions split into smaller amounts to stay under approval thresholds, a common sign of internal misuse
• Unexpected account changes: Updates to user access, billing addresses, or contact details that no one approved

5 common types of business credit card fraud

Business credit card fraud doesn't follow a single pattern. It takes many forms because businesses use credit cards for a variety of purposes, such as travel, vendor payments, and recurring subscriptions. Each of these creates unique opportunities for fraud to slip through.

Some fraud comes from outside your small business. Other times, it comes from the inside. The methods vary, but the problem is the same: Unauthorized spending that hurts your bottom line.

1. Stolen card or card number usage

Stolen credit card fraud happens when someone gets access to your physical business card or card number and uses it to make unauthorized purchases. In many cases, the card isn't lost or stolen in a traditional sense; the number is compromised. That's all it takes for someone to charge your account without your knowledge.

Card numbers can be stolen through phishing, malware, payment system breaches, or even public Wi-Fi networks. Criminals use that information to make purchases online, over the phone, or in-store with cloned cards. The risk grows quickly if your team uses shared cards or emails card details to vendors.

This type of fraud is common because card numbers are easy to capture and difficult to trace. The larger the team, the more challenging it is to spot these charges. You might not notice until a large, out-of-policy transaction hits your account or a vendor asks about a payment you did not authorize.

2. Account takeover scams

Account takeover fraud happens when someone gains unauthorized access to your company's credit card account and uses it to make changes, add users, or spend money without approval. Unlike card theft, this type of fraud does not require physical access to a card. It only takes compromised login credentials to get in.

Most takeovers begin with phishing emails, fake login pages, or malware that captures your login information. Once the attacker gets into your account, they can change passwords, update contact details, request new cards, or reroute notifications. This gives them full control while keeping you in the dark.

You might not notice right away because the fraudulent activity often happens inside a legitimate account. Card transactions may appear normal at first, especially if the attacker mimics typical spending patterns or keeps charges small and infrequent. By the time you catch it, thousands of dollars could be gone.

To protect your account, make sure every user has their own login and uses two-factor authentication. You should also limit who can request new cards or change account settings. Choose a card platform that tracks user actions and flags suspicious activity in real time.

3. Fake vendor or supplier fraud

Fake vendor fraud happens when someone tricks your company into paying for goods or services that don't exist. The scam usually starts with a fake business name, a forged invoice, or a spoofed email that looks like it came from a real vendor. If your team approves the charge without verifying the vendor, the credit card payment goes through, and the funds may not be recoverable.

Sometimes, the fraudster creates a fake vendor and submits invoices for services never rendered. In others, they impersonate an existing vendor by changing the payment details or domain name.

You face more exposure to this type of fraud if your vendor onboarding process lacks rigor or if employees have access to corporate cards without clear controls. Fraudsters count on you to move quickly. They design their invoices to match your usual format so that no one questions the charge.

This isn't a rare occurrence. According to the FTC, imposter scams—a category that includes fake-vendor and invoice fraud schemes targeting businesses—were the second-costliest fraud type in 2024, with $2.95 billion in reported losses. Many of these incidents started with fake vendors or impersonation attacks targeting finance teams.

To prevent fake vendor fraud, build verification into your payment process. Tightening your procurement processes is one of the most effective ways to close the gaps fraudsters exploit:

• Verify every new vendor's identity before you process a payment
• Confirm any change to bank details or contact information through a separate, trusted channel, not the email that requested it
• Require approval for new payees, and flag high-risk charges automatically
• If a vendor doesn't pass verification, don't process the payment, regardless of the amount

4. Internal misuse by employees

Internal misuse happens when employees use company credit cards for unauthorized or personal expenses. Unlike someone committing external fraud, the person spending the money already has access to the card, making it harder to detect, especially when the charges don't raise immediate red flags.

This type of fraud can take many forms. An employee might charge personal meals, split a large expense into smaller ones to avoid triggering approvals, or label a non-business purchase as client-related. In some cases, someone may use a company card after leaving the company because their access was never revoked.

To reduce the risk of internal misuse, build controls that don't depend on catching problems after the fact:

• Issue individual cards: Give each employee their own card instead of a shared one, so you have visibility into who is spending, where, and why
• Set role-based limits: Use your employee credit card agreement to set spending limits by role, department, or responsibility level, and restrict purchases by merchant category
• Automate policy review: Ramp's Policy Agent, an always-on AI reviewer trained on your real expense policy, reviews 100% of transactions and catches 7x more out-of-policy spend than traditional rule-based systems, at 99%+ accuracy, so misuse doesn't slip through the cracks

5. Phishing and social engineering attacks

Phishing and social engineering attacks use deception to gain access to your company's credit card information. These attacks do not rely on technical hacking. Instead, they exploit trust, urgency, or confusion to trick someone on your team into handing over sensitive data.

A phishing attack usually looks like an email from a trusted source. The email might ask you to update payment details, log in to a vendor portal, or confirm a transaction. It often includes a link to a fake website that collects your card information or login credentials. Once the hacker has that data, they can use it to make unauthorized purchases or access accounts.

Social engineering takes a similar approach, but it often happens over the phone. A scammer may impersonate a vendor, coworker, or even someone from your finance team. They might say there's an urgent issue that needs immediate payment. If your team member does not verify the request, they could process a fraudulent charge using your business card.

Wire fraud scams work because they target people, not systems. You're more vulnerable if your approval process is rushed or your team isn't trained to question suspicious messages. To protect your business, train employees to recognize signs of phishing and social engineering.

How business credit card fraud impacts companies

According to the ACFE, fraud costs organizations an estimated 5% of revenue each year. But your business can lose more than money.

When someone makes a fraudulent charge, your available credit decreases—and even if the card issuer eventually refunds the amount, you still lose access to those funds in the meantime, which can affect your ability to pay vendors, cover operational expenses, or meet payroll. That same incident creates more work for your finance team: identifying the unauthorized charge, investigating how it happened, correcting the financial records, and, if it hits during month-end close, delaying reporting and throwing off your timelines.

When the fraud involves someone inside your company, the impact on trust can be even more serious. You may need to review internal policies, remove card access, or add extra layers of approval. These changes take time and can slow down routine operations.

Fraud also creates audit and compliance concerns. Failing to catch and prevent fraud could raise red flags with auditors and regulators if you operate in a regulated industry or manage sensitive financial data. It may also lead to penalties or a loss of credibility with stakeholders. Finance teams that invest in preparing for future operational risks are better positioned to catch fraud early and limit its downstream impact.

The longer fraud goes undetected, the more expensive the cleanup. When you only reconcile monthly, a fraudulent charge can sit for weeks, compounding the financial and administrative damage before anyone catches it. That's why prevention and real-time monitoring matter more than after-the-fact detection.

Tips to prevent business credit card fraud

Credit card fraud prevention for businesses isn't just about reacting when something goes wrong; it's about building smart habits into your daily operations. Here are key steps your business can take to reduce risk and keep spending secure:

• Automate spend controls: Set daily or per-transaction limits by employee role and block unauthorized merchant categories automatically. With Ramp Corporate Cards, these limits are enforced at swipe, so out-of-policy charges are blocked before spend happens and 3.5% of transactions that would otherwise violate policy never go through.
• Train employees on fraud tactics: Make fraud detection training part of your employee onboarding and revisit it regularly. Teach employees how to spot phishing, invoice scams, and social engineering tactics while emphasizing the importance of protecting card and account information.
• Monitor transactions daily: Set up alerts for unusual purchases, high-value transactions, or new vendors. If you have a corporate card expense management platform, review daily summaries or flagged transactions.
• Conduct regular account audits: Schedule monthly or quarterly audits of credit card activity and account settings. Involve both finance and department leads to review card usage and flag any anomalies.
• Use secure payment methods: Rely on virtual cards for vendors and limit the use of physical cards when possible. Virtual cards can be locked to a single merchant, so they're useless even if the card data is compromised, and each user should implement two-factor authentication.

How to report fraudulent charges

If you suspect fraud on your business credit card, you should take action as quickly as possible. Move fast to freeze the account and gather evidence, then figure out what actually happened. When the charge involves an employee card, separate honest mistakes from deliberate theft through a direct conversation with the cardholder and, if needed, HR before you enforce policy.

Follow these steps to report the issue and protect your company from further damage:

1. Contact your card issuer immediately

Reach out to your credit card issuer as soon as you notice suspicious activity. You can typically do this by phone or through your online account dashboard. Ask them to freeze the account or deactivate the card to prevent further charges.

2. Gather and document evidence

Go through recent transactions and flag anything that looks unusual or out of policy. Save relevant receipts, emails, or internal messages that could help support your claim during the investigation.

3. File a report with law enforcement or the FTC

If the fraud involves a large amount of money or appears to be part of a broader scam, consider filing a report with your local police department or the FTC at reportfraud.ftc.gov. This step may be necessary for legal or insurance purposes.

4. Notify affected employees or departments

Let anyone connected to the card or the transaction know what happened. This includes employees with card access or teams working with impacted vendors. Clearly communicating the incident helps prevent further misuse and protects others from similar fraud attempts.

5. Follow up and secure your accounts

Follow up with your credit card issuer to confirm the fraudulent charges have been disputed and that the affected card has been canceled or replaced. Then, review and update your account settings, like passwords and account access, to reduce the chance of it happening again.

Stop fraud before it starts with Ramp

Small business credit card fraud is a real and ongoing threat. Each type of fraud targets a gap in your process, whether that's weak card controls, missing approvals, or a lack of visibility across teams. To protect your business, you need prevention built into every step of your spending process.

The Ramp Business Credit Card offers built-in fraud prevention tools, letting you set rules for how each card is used, monitor online transactions in real time, and automate approvals based on your company's policies.

Ramp also enforces multi-factor authentication and role-based permissions to reduce the risk of account takeovers. Each user gets their own login, and you can control who can issue cards, approve spending, or update account settings.

Try an interactive demo and see how Ramp's modern corporate cards help customers save an average of 5% a year across all spending.