Fairfax County provides the option to pay most of your tax bills online. Simply input information from your bill and you will be able to pay online!Please retain a copy of your bank statement for receipt confirmation. Instruction to your Bank or Building. In addition, you must attach a voided check. Name on the Account. Looking for a way to pay for your sperm and specimen storage fees with Fairfax Cryobank? Visit this page to learn how to pay online. We accept Visa Debit, Mastercard Debit, Maestro and Electron. If you want to pay off your mortgage in full, please complete our online form.