Yes. As part of our commitment to provide citizens with efficient, convenient services, Harford County, Maryland has partnered with Official Payment Corporation, a third-party provider to offer electronic payments over the Internet or by telephone. The third-party provider will assess a convenience fee each time you utilize their service to make Tax and Assessment payments by credit/debit card. Harford County accepts Visa® , MasterCard® and Discover® credit cards and electronic checks. If paying by credit/debit card, there will be a 2.25% convenience fee. If paying by electronic check, there is no fee.