Millions Risk Fraud with Invalid Bank Cards Despite Rising Crime
Millions of UK consumers could be unwittingly carrying bank cards that are technically invalid, leaving them vulnerable to fraud at a time when card crime is experiencing a significant surge across the nation. New research from MoneySuperMarket has uncovered a startling security oversight that affects the vast majority of adults.
The Signature Strip Oversight
The study reveals that over three quarters of adults have neglected to sign the signature strip on the back of their debit or credit cards. Experts caution that this basic step remains crucial, even in the era of contactless payments and chip-and-PIN technology. The research discovered that a mere 24% of people have actually signed their card, implying that a substantial 76% are in possession of cards that could be considered technically invalid under the terms of many card issuer agreements.
Even more concerning is the widespread lack of awareness surrounding this issue. A staggering 94% of those surveyed admitted they were completely oblivious to the fact that an unsigned card could be deemed invalid. Alarmingly, only 24% stated they regularly carry and use physical cards for payments, suggesting many might not even be aware their card lacks this vital security feature as they rely more on digital wallets and contactless methods.
Rising Fraud Landscape
This warning arrives as card fraud continues its steep ascent across the United Kingdom. Between January and June 2025, over two million card fraud incidents were reported nationally, while so-called card-not-present fraud soared by 22%, making it easier for criminals to misuse stolen card details online or in physical retail environments.
Victims typically lose around £300 per incident, and reclaiming that money is becoming increasingly challenging for consumers. With the rise of AI-generated fake identities complicating fraud detection, prevention service Cifas recorded more than 118,000 identity fraud cases in the first half of 2025 alone.
Experts warn that an unsigned card can significantly exacerbate the situation if a card is lost or stolen, potentially complicating disputes with banks and financial institutions when attempting to prove unauthorized transactions.
Expert Security Advice
Kara Gammell, credit expert at MoneySuperMarket, emphasized the importance of this simple security measure. "Your signature might feel like a small detail, but it's actually an important security step," she explained. "It helps confirm that you authorised a transaction and gives you an extra layer of protection if something goes wrong."
She added: "Even in an age where most payments happen through chip-and-PIN or contactless payments, your signature still matters. If your card is ever lost or stolen, an unsigned card is far easier for someone to misuse – and harder for you to dispute. It only takes a few seconds, but signing your card could give you valuable protection if the worst happens - and that extra peace of mind is always worth it."
The Art of Signature Security
To highlight the issue further, MoneySuperMarket has collaborated with handwriting expert and graphologist Tracey Trussell, who explains that the way you sign can also make a significant difference in security. She advises cardholders to keep their signature natural and avoid overthinking the process.
"You don't need to overthink it – just write as you would normally," Trussell recommends. "Your handwriting is naturally full of unique patterns, and those subtle differences create authenticity."
Speed matters considerably in signature security, she explained. "The key is to write quickly. Speed is difficult to replicate, and someone trying to copy your signature will write more slowly and carefully, struggling to reproduce the natural look of your signature. So, don't worry too much about appearances and don't hold back. A natural, flowing movement is difficult to fabricate and imitate."
Complexity can provide additional protection, according to Trussell. "Think of your signature like a password – the more complex, the better. Writing your full name, including a middle name if you have one, makes it harder to imitate. If your name is short, add a small distinguishing feature, such as a tiny full stop at the end. These details are often missed by forgers."
She warned against overly simple signatures, adding: "One common mistake is making a signature too simple. A quick scribble is much easier to copy than one with structure and intention. Those small deviations from how you were taught to write should be embraced. It's the tiny quirks in your writing that make a signature uniquely yours – and difficult for anyone else to replicate."
Ms Trussell concluded: "Your signature is consciously designed and manufactured, so you're in control. And it's all the little quirks and deviations that should be treasured and celebrated because they make your handwriting more authentic and individual, and your signature legally binding and trustworthy."
As card fraud continues to rise across the UK, this simple security measure of signing your bank card could provide crucial protection for millions of consumers who might otherwise find themselves vulnerable to financial crime and complicated disputes with their banks.
