Call toll-free 1-800-2PAYTAX (1-800-272-9829). Pay online or call 800-272-9829.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. If you're bank treats it as overpayment, then they may add the extra amount to your credit card limit. When you overpay your credit card, extra funds generally remain as a credit on your account. But there are more options you may consider. Effective July 1, 2024, it's illegal to surcharge credit card transactions in California. Employee consent is required for an overpayment amount to be deducted from a future pay check or remitted via check or credit card. Promptly credit or refund overpayments and other amounts owed to your account if the amount you're owed is more than one dollar.