Most nonprofits don't think about fraud until something feels weird. A run on $5 donations. An unusual spike in failed transactions. Or, worst of all, you start getting grilled on questions you can't answer.

And by the time the panic subsides and you start digging, the damage has been done.

To be clear, donation fraud is more common than you might think, and it rarely shows up with a flashing neon sign. Rather, it chips away at revenue, makes your data a mess, and can start to erode donor trust.

Research from Wiley found that nonprofits lose an estimated 5% of their annual revenue to fraud, and 22% of cases involve losses of more than $1 million—numbers that add up quickly for organizations already working with limited resources.

Let's take a look at what, exactly, donation fraud is. Then we will examine how you can spot it early and shut it down before things get worse.

What is Donation Fraud?

Donation fraud is any unauthorized, deceptive, or malicious transaction that takes place through a nonprofit's donation system. It is a specific type of payment fraud that occurs within nonprofit fundraising systems.

This can include stolen credit cards used on donation forms, bots testing payment information, fake donations followed by refund requests, or attempts to access donor data.

Simply put, it's any activity that uses your fundraising tools to move money or data in a way you didn't intend.

What Donation Fraud Looks Like

We touched on a few warning signs above, but donation fraud is rarely one isolated event. Rather, a few broad patterns start to show up.

Here are five things that should make you look twice:

• Clusters of low-dollar donations within minutes of each other
• A sudden rise in declined or failed payments
• Repeated amounts, identical emails, or matching names
• Traffic spikes that don't match a campaign
• Fake names, strange emails, or missing donor info

On their own, one or two of these events might not mean you should worry. But when several of these show up at once, it's often a sign of fraud.

Common Types of Donation Fraud

Before you can prevent donation fraud, it helps to understand the most common ways it shows up. 

Credit Card Testing Fraud

This is the one most nonprofits run into first.

Fraudsters use your donation form to test stolen credit cards. They want to see if the card is valid and can be used elsewhere for bigger transactions, so they'll take a group of numbers and try to make a small (usually $5) donation. 

You'll see repeated small donations, corresponding spikes in declined transactions, and repeated hits in a short time frame.

Donation Form Abuse

If you see massive unexplained traffic spikes, that can be bots or scripts repeatedly hitting your donation page. This is where you'll see some of those patterns in amounts or donor details.

This can also be card testing, and too much of it (and there can be a lot at once) can completely overwhelm your system.

Refund Fraud

This one's a little trickier to spot, but it's just as costly. And it happens fairly often.

Someone with a stolen credit card will make a sizeable donation. After a short period of time, they'll request a refund. If you know how payment processing works, you'll know that your nonprofit issues the refund before the original transaction can settle. You won't know it isn't going to settle because the card was stolen.

This means you must look closely at refunds. Legitimate refunds may happen, but they should be explainable and easy to trace.

Data Access and Misuse

Sometimes, the goal isn't abusing the transaction itself. Rather, people are trying to get donor information, test system vulnerabilities, or use your platform to gather usable data.

This, sadly, is how fraudsters educate themselves to swindle people. If they know birthdays or addresses or the name of a spouse, they'll get closer to the victim.

Even if funds aren't immediately impacted, the long-term risk is significant.

How to Prevent Donation Fraud

We know what it is, what it looks like, and how to identify common types of donation fraud. But the next step is learning how to prevent it.

With the right controls in place, most donation fraud can be reduced significantly.

Start With Your Donation Form

Believe it or not, your donation form is where most attacks start. Paying attention to some small things here can save you a big headache.

• Set a minimum donation amount. While you don't want to turn away any donors, if you avoid allowing very small gifts (maybe under $10), you'll prevent that card testing we talked about.
• Add CAPTCHA or bot protection. Yes, donors find these annoying, but they still work because they stop automated scripts from submitting forms repeatedly. Some CRMs have reCAPTCHA v3 on forms by default, which works in the background and is invisible to donors.
• Limit rapid submissions. Prevent multiple transactions from the same user in seconds. That's rarely an intentional donor.
• Keep the form clean and predictable. The more complex your form is, the more vulnerable it is. 

These are small changes, but they remove many of the easiest entry points for fraud.

Turn On Payment Verification Tools

Most of the time, nonprofits have payment verification tools at their disposal but they don't know they need to be configured. And that's where things can slip through the cracks.

• AVS, or Address Verification System, confirms the billing address matches the card. If it doesn't, that's a strong signal the transaction isn't legit.

• CVV Verification requires the card security code. This adds another layer that prevents stolen card numbers alone from passing.

• Decline mismatches—if something doesn't match, don't let the system push it through. It's better to lose a questionable transaction than deal with chargebacks and cleanup later.

These settings aren't complicated, but they can make a meaningful difference.

One thing many nonprofits don’t realize is that fraudsters often test systems in layers. They may start with small transactions, adjust based on what gets through, and then escalate. If your settings aren’t consistent across your form, payment processor, and internal processes, those gaps can be exploited quickly.

Monitor Activity in Real Time

By the time you're reviewing reports at the end of the day, the transactions have already gone through.

That's why it helps to have some level of real-time visibility in place. Setting alerts for spikes in transaction volume or failed payments can help you catch issues early. You can also flag multiple submissions within a short window or monitor activity more closely during campaigns and high-traffic periods.

It doesn't need to be complex. While some CRMs do offer real-time dashboards, even a simple layer of monitoring can give you enough visibility to spot problems early and respond before they escalate.

Use Fraud Detection and Blocking Tools

Even with strong form settings and verification in place, some fraudulent activity will still get through. That's where automated fraud detection tools come in.

This is where many nonprofits either gain visibility or lose it entirely.

Many modern platforms can offer significant protection against donation fraud. They can automatically:

• Flag high-risk transactions based on behavior
• Identify unusual velocity or repeated attempts to access your donation form
• Block suspicious IP addresses or locations

This reduces how much you need to catch manually and gives you a second layer of protection behind your form and payment settings.

Without this layer, you’re relying on someone noticing a problem after transactions have already gone through. At that point, you’re dealing with cleanup instead of prevention. Automated detection shifts that timing. It helps you catch activity as it’s happening, not after the damage is done.

Check with your current system to see if they offer this. If not, it may be time to evaluate whether your current system gives you enough protection and visibility. This is where having a system that connects your donation form, payments, and data in one place can make a big difference.

Tighten Your Refund Process 

Refund fraud is one of the easiest places for fraud to slip through, and it's one of the easiest to control. 

As you read earlier, a refund is often issued before the original transaction fully settles. If the original transaction was made with a stolen credit card, the payment may never settle. By the time it fails, you've issued the refund, and your organization must cover the loss.

Here are a few simple controls that can prevent this:

Require a second set of eyes before issuing a refund. This should be someone in finance or a manager, or anyone other than the person processing the transaction. This "external" view can spot irregularities you might miss.

Only refund to the original payment method. This sounds obvious, but if you're trying to help an upset donor and they want the money refunded to their bank account, it's likely you'd oblige. The problem is when that upset donor is trying to steal from you—only refund transactions the way they originated.

Take a close look at large or unusual requests. If your organization rarely receives large gifts and a $10,000 donation is quickly followed by a refund request, alarm bells should start going off.

Again, refunds should be rare. If they're happening often and they're legitimate, that's also worth investigating.

Keep Your Data Clean

This is one of the least-talked-about parts of fraud prevention, but it makes a difference. We talk about data hygiene often but don't often tie it to fraud. The truth is that fraud shows up in patterns, and patterns are much harder to see when your data is messy.

Duplicate records, inconsistent formatting, and incomplete donor profiles make it difficult (if not impossible) to connect activity across transactions.

When your data is clean and consistent, it becomes much easier to spot repeated behavior, identify anomalies, and trace suspicious activity across records.

This won't stop fraud on its own, but it makes it easier to find and easier to stop.

The Real Cost of Donation Fraud

Donation fraud doesn't just show up as a few bad transactions. The impact tends to spread across your organization. 

There's the obvious cost. Chargebacks, processing fees, and lost donations add up quickly. And in many cases, you're not just losing the original gift; you're paying additional fees on top of it.

There's also the operational cost. Time spent investigating transactions, cleaning up data, and responding to issues pulls your team away from fundraising and donor engagement.

Then there's the data problem. Fraud creates duplicate records, incomplete profiles, and inconsistent reporting. That makes it harder to understand what's working and harder to make decisions.

And finally, there's trust. Donors expect their information to be handled carefully. When something goes wrong, even if it's not visible to them, it can affect how confident they feel giving again.

Fraud isn't always a headline event. But left unchecked, it can quietly erode revenue, efficiency, and trust at the same time.

What to Do If You Suspect Fraud

If something feels off, slow down and take a closer look. 

• Increase your minimum donation setting to limit testing behavior.
• Turn on stricter verification settings if they aren't already enabled.
• Limit how frequently transactions can be submitted.
• Review recent activity for patterns, rather than looking at isolated transactions.
• Contact your payment processor if you're unsure how to interpret what you're seeing.

You don't need to shut down your donation page, but you do want to reduce risk while you figure out what's happening.

And this assumes you've covered the basics of donation fraud prevention:

• Minimum donation amount set
• CAPTCHA or bot protection enabled
• AVS and CVV turned on
• Transaction limits configured
• Refund processes reviewed and controlled
• Monitoring or alerts in place

Cover the basics and keep your eye on data. If something looks off, follow the steps to tighten your controls.

Donation Fraud Prevention FAQ

What is donation fraud?
Donation fraud is any unauthorized, deceptive, or malicious transaction that takes place through a nonprofit’s donation system.

How can nonprofits prevent credit card testing?
Nonprofits can reduce credit card testing with a few layered controls: a minimum donation amount, CAPTCHA, AVS and CVV checks, rate limiting, and monitoring of failed transactions.

What are the signs of donation fraud?
Common signs include clusters of low-dollar donations, spikes in failed payments, repeated donor information, unusual traffic, and suspicious or incomplete donor details.

Why are nonprofits targeted for payment fraud?
Nonprofits are often targeted because donation forms are public, easy to access, and designed to reduce friction for legitimate donors. They also tend to have less mature fraud tools than e-commerce sites, and donation forms accept any amount from any geography. Both of these make them attractive testing grounds.

Protecting Your Donations Starts with Small Changes

Donation fraud rarely starts with something dramatic.

It starts small. A few low-dollar transactions. A few failed attempts. Activity that doesn't quite look right.

The difference is whether it gets noticed early.

Most of the steps to prevent fraud aren't complicated. They're small adjustments. A setting turned on. A limit put in place. A process tightened. But those small decisions add up.

They protect your revenue. They keep your data clean. And they give you confidence that your systems are working the way they should. 

Fraud doesn't usually break your system all at once. It finds the small gaps that you didn't think mattered.

And at the end of the day, it's more than stopping bad transactions. It's about making sure every real donor interaction counts.