How Do You Tell a Legitimate Overpayment From a Scam?

By The Penny Plan Editorial Team Published July 13, 2026 6 min read

A buyer sends more than the agreed price for something sold online, or a new paycheck lands higher than expected, followed by a request to send back the difference. It feels almost polite on the surface — an honest mistake, quickly fixed. But this exact pattern is also one of the oldest tricks in the book, which makes it worth slowing down before doing anything.

In a nutshell

A legitimate overpayment usually comes from a verifiable source, through a payment method that has actually cleared and settled, and without pressure to refund it immediately. A scam version typically involves a check or transfer that only looks cleared, urgency to send money back the same day, and a sender who can’t be independently confirmed. When several of those signals show up together, the safest assumption is that something is off until proven otherwise.

Why this scam works so well

Signs that point toward a scam

What to check before sending anything back

Where this shows up beyond online sales

The same pattern appears in ticket resale, apartment deposits, and freelance gigs paid up front. Anyone buying tickets from a stranger online may recognize the identical setup: an overpayment, a request to send part of it elsewhere, and pressure to move fast. Recognizing the pattern in one context makes it easier to spot in another, since scammers tend to recycle the same basic script with small variations.

Worth remembering

An overpayment is not automatically a scam, and legitimate billing or payroll errors do happen. What separates a real mistake from a setup is verifiability and time: a genuine sender can usually be confirmed through an independent channel and has no urgent need for a same-day refund. A cashier’s check often costs more than a personal check precisely because it represents guaranteed funds, which is part of why scammers gravitate toward payment types that only look similarly certain. When the details don’t add up, slowing down to verify costs nothing, while acting quickly on an unverified refund request can be difficult to undo.