Once you let the company know your information has been stolen, they’ll likely cancel the card and send you a new one. If the thieves made any unauthorized transactions, you’ll have to walk through these items with the issuer. If your card number, rather than the plastic itself, was stolen, you won’t be liable for those charges. Similarly, if you report the theft before any charges are made, you won’t be liable. Unfortunately, if neither of those situations apply to you, you might be on the hook for up to $50, but it depends on the card issuer’s policy—some may not charge you anything.