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Quick Reference Help
To help ACI Payments, Inc. Customer Service Representatives assist you with your questions, please have the following information handy when you e-mail or call us:
  • Name of the government entity you want to pay (e.g. Internal Revenue Service, New York State, or Bexar County, TX).
  • Amount you want to pay.
  • Contact e-mail address or telephone number where you can be reached.
  • Confirmation number and the last four digits of your credit or debit card number, if you have already made a payment.

Pay By Phone - Toll-free 1-800-2PAY-TAXsm
(Automated Telephone Service - 24/7)

Federal Payment Inquiries - Toll-free 1-877-754-4413
International - 1-334-521-3843
(Automated Telephone Service - 24/7)

The Internal Revenue Service (IRS) can be reached at the following toll-free numbers:
  • U.S. Internal Revenue Service Customer Service Inquires
  • Personal Taxes: Toll-free 1-800-829-1040
  • Business Taxes: Toll-free 1-800-829-4933

Online Payment Inquiries - e-mail our Customer Service Department at or call 1-866-964-2552 for Customer Service assistance (Monday - Friday, 7:00am - 6:00pm ET).

International Payments Inquiries - 1-703-653-2499
(Monday - Friday, 7:00am - 6:00pm ET)