To facilitate efficient processing, each invoice presented by a vendor needs to be free from mathematical and quantity errors and contain the following elements:

  • Name of the vendor and "Remit to" address
  • Vendor invoice number and date
  • Vendor contract contact name and phone number
  • County contact name
  • Name of County department
  • Valid Purchase Order number
  • Written description of goods/services delivered
  • Delivery date or service date
  • Substituted items must have documented approval
  • Quantity and unit price of item
  • Extension on each line item
  • Total Amount Due
  • Payment Due Date
  • Payment Terms and Discount
  • Shipping payment terms
  • Supporting documentation: Detailed itemized receipts must be provided for all vendor expenses or reimbursement requests.

Additional Requirements for Professional and Personal Services Invoices

  • Description of services performed
  • Date services were performed
  • Total amount due
  • Other information as required by contract or federal/state grantor agency

These lists are not all-inclusive and contractual provisions or other requirements may need to be provided.

All hard copy invoices should be mailed directly to:  

Harris County Auditor's Office
Accounts Payable
1001 Preston, 8th Floor
Houston, Texas  77002

Vendors are encouraged to submit electronic invoices via email to:

Additional Vendor Information
Harris County is tax exempt
Provide a valid W-9, IRS W-9 form
Buy American Provision   


How to register for direct deposit payment or change banking information

  • Request an ACH Vendor Payment Authorization Agreement from Accounts Payable for completion and return to our office.
  • Ensure the form is signed by an authorized company officer.
  • Attach a voided check or bank verification letter.
  • Mail it to Harris County Auditor's Office, 1001 Preston, 8th Fl., Houston, TX  77002.