Businesses have come to expect some collateral damage in their never-ending battle against fraud. After all, it’s impossible to block fraudsters without accidentally blocking a few good customers, right? And false positives certainly seem better than a runaway fraud problem.

But blocking good customers may hit your bottom line harder than you’d think…and in ways you haven’t anticipated. Here are ten things you need to know as you grow your business.

1) It’s hard to keep false positives and fraud low.

False positive happen because businesses err on the side of over-blocking suspicious transactions rather than letting a few savvy fraudsters get through. If they tip their security measures in the other direction, they risk inviting fraudsters – putting their data and their customers’ data on the line.

2) Customers hate the very security measures that keep them safe, even though they expect that safety.

Customers trust businesses to provide a frictionless user experience, but also to keep their information secure. That means they’ll abandon their cart at the vexing sight of a checkout page that requires repeated identity verification, but they’ll also hesitate to trust businesses that have experienced data breaches.

3) Good customers are blocked all the time.

False positives are a common speed bump for people trying to make a transaction. Around 33 million Americans had at least one honest transaction denied last year. That’s 15% of all cardholders in the U.S.

4) That’s why false positives are a top concern for most businesses.

The Sift Science Fraud Trends 2017 Report found that 72% businesses are concerned about turning away good customers.

5) Businesses often block high-value transactions.

Many businesses have stricter transaction controls on expensive merchandise; after all. But they might be overdoing it. 66% of honest customers whose transactions were blocked were making a purchase of over $100, while 40% were making a purchase of over $250. In many cases, these customers don’t bother to dispute the hold on their transaction. Instead, they just leave the site…and their purchase.

6) False positives are more expensive than actual credit card fraud.

Businesses that blocked honest customers lost an astonishing $118 billion last year. And real fraud? That only added up to $9 billion.

7) And the cost isn’t just monetary.

It’s reputational, too. When customers feel inconvenienced, they’re unlikely to shop at the offending business again. To make matters worse, a whopping 89% of customers who’ve been hit with a false positive ban turn to a business’s competitor.

8) Adopting looser fraud prevention strategies might not be the answer.

If a business relaxes its fraud controls…well, fraud will occur! Unforgiving consumers don’t react well to reports of fraud. Nearly half say they’d stop using a credit card or service as a result of fraudulent activity. So, businesses are between a rock and a hard place.

9) It’s not as simple as just acquiring new customers, either.

When a disgruntled customer turns to a competitor, businesses might be tempted to write off the loss and focus on seeking new customers. But that’s not cost effective. Studies have found that acquiring new customers costs way more than retaining an existing one – anywhere from 5 to 30 times more. That means it’s not enough to prevent fraudulent transactions. Businesses must pay attention to their false positive rate to stay afloat.

10) Many merchants don’t think they can reduce their false positive rate with their existing fraud prevention solutions.

About one-third to one-half aren’t happy with the number of honest customers they’re scaring off. Maybe you’re one of them. But what can you do to retain loyal customers while growing your business and keeping fraudsters at bay? Here’s how one company started beating fraud with zero false positives. Not sure whether you’re blocking good customers in the first place? This handy guide is a good place to start. Happy fraud fighting!

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Roxanna "Evan" Ramzipoor

Roxanna "Evan" Ramzipoor is a writer on the marketing team at Sift Science. Her fiction is represented by Kristin Nelson of Nelson Literary. To see more of her work, check out her blog: