VERIFY: Here's why your misprinted $20 could be worth $500 A viral TikTok says a $20 bill with a mismatched serial number could be worth more than $500. Experts say that's entirely possible. Author: Erin Spaht, Mia Salenetri (WUSA9) Published: 12:44 PM EDT March 26, 2021 Updated: 5:54 PM EDT April 5, 2021 WASHINGTON — Everyone wants to make money. And if you can turn a profit out of the bills in your pocket, that's even better. A viral TikTok with more than 5 million views says that if you find a $20 bill with a mismatched serial number, you can sell it for more than $500. In the interest of getting you some serious bang for your buck, we talked to the experts to get the facts.