Bulk Payments

Maricopa County offers a FREE and simple solution to Mortgage Companies, Tax Servicing Companies, Developers and other multi-account payers – The Corporate Services System (CSS).

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Arizona Revised Statutes (42-18051/E) allows County Treasurers to require electronic transmission of tax payment support documentation from third party payers or entities with a high volume of accounts.

Why CSS?

Why CSS?

The CSS was designed for any entity making regular tax payments, annually or semi-annually, for 20 or more tax accounts (real estate parcel, mobile home, business personal property, and/or centrally assessed) at the same time.

Typical clients include: tax services, mortgage companies, real estate developers and investors, banks (reo), utilities companies and railroads, retail store chains and restaurants, management companies, and individuals.

The CSS clients manage their accounts and payments through electronic request and payment files.

CSS is exclusively for current year tax processing.

What is required?

What is required?
  • Internet access.
  • Electronic Spreadsheet: MicroSoft Excel, Lotus 1-2-3, Apache OpenOffice Calc, or a Text file saved the comma delimited format (.CSV).
  • No special hardware is required.

What is the CSS process?

CSS Process
  • A request file is uploaded to the CSS.
  • Once all accounts are stored, a payment file is generated and available through the CSS for download.
  • The payment file, once reviewed and edited, if necessary, is uploaded to the CSS.
  • Payment is remitted with a corresponding remittance voucher, generated through the CSS.

How is Payment remitted?


Payment is submitted by check, ACH credit, or wired funds. (Currently credit card and ACH debit are not available options.)

How do I register?

How to register

Contact the Corporate Services representative at (602) 506-6052.

What is the mailing address?

Mailing Address
  • Attention: Corporate Services
  • Maricopa County Treasurer's Office
  • 301 West Jefferson, Suite 100
  • Phoenix, Arizona 85003-2199

For more information about the CSS or how to apply for access, please contact the Corporate Services department at (602) 506-6052.


Terms of Use

The Maricopa County Treasurer has made every effort to ensure that the information contained on this Web site is accurate and current. However, the Treasurer’s Office does not guarantee that each and every item of information is completely accurate. Therefore, the user is advised to make his or her own independent analysis and investigation prior to reliance on this information. The Maricopa County Treasurer’s Office hereby disclaims liability for any damages, direct or indirect, arising from use of or reliance upon this information.

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Parcel number 123-45-678 9, can be entered as 123 45 678

Parcel number 123-45-678a 9, can be entered as 123 45 678 a

For Mobile Home/Business Personal Property - Use the personal property roll number with a prefix of 9 as the parcel number.
Example: Roll number 60-00-001 8 can be entered as 960 00 001.

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