There are no penalties if you've accidentally paid more than you owe, and there are laws in place that require issuers to refund your overpayment. There's no penalty for overpaying your credit card.Just go to the branch fill out the paperwork for an incorrect bill payment. When you overpay your credit card, extra funds generally remain as a credit on your account. But there are more options you may consider. If you overpay your credit card, you can request a refund or keep the negative balance until you make new purchases. Any over payment they keep will be used to pay or reduce future incoming billings. An overpaid credit card can result in a negative balance and shrink what you owe on your next statement, but it won't boost your credit score or credit limit.