Contact Us

New Customers: Email us your serial number, contact information, and Installation number to register your software to the email address below.

If you are in need of Technical Support, please submit a problem report withe a description of your issue by going to Help/Submit Problem Report. If you are unable to send a Problem Report, please message us at the inquiry@c21accountingsoftware.com. We will respond to your issue via email as soon as possible between 11:00 AM and 5:00 PM (CST), Monday - Thursday, and 12:00 - 4:00 CST on Friday. Any Technical Support Incidents requested after 4:00 PM will be replied to the following business day.

If you require assistance, please send us a Problem Report by going to Help/Submit Problem Report from your C21 menu.

Holiday Hours: We will be closed December 23-26, and 31, 2024 and January 1, 2025. If you require assistance during this time, please contact us at the email address listed below with a detailed description and your company name and/or serial number. We will get back to you the next business day.

For information related to COVID-19 issues, please click here.

21st Century Accounting
P.O. Box 66561
Austin, TX 78766-9998
Fax: (737) 200-1177
Email: inquiry@c21accountingsoftware.com

If you are unable to email us or send a Problem Report for Technical Support, please call us and leave a message at the number below:

Phone: (888) 542-5068

Existing customers: Need help finding your Serial Number, Version Number, or installed add-ons? Click here.