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Approved Third Party Software for Sales Tax Electronic Filing
The companies listed below offer the ability to file a sales and use taxes return using their own software.  We will add to this listing as other vendors become approved through testing.  These companies may be web-based companies, or traditional software development companies who produce a product that formats and transmits electronic returns.
Click on the linked logos below for more information.

Trustfile Sales and Use Tax e-filing and e-payment software is available for Connecticut. With an interface specifically designed for ease of use, Trustfile provides enhanced functionality, secure transmission, and free technical support.  

Software benefits include automatic form calculations, data import from virtually any spreadsheet, data archiving, and a helpful “Transmission Manager” that walks you through the process.

Trustfile also offers secure, confirmed transmission via internet.  Complete all of your work safely off-line, logging on only for transmission.  Trustfile is currently offered in eleven states, and free Connecticut software is now available.


AviorData Tax Compliance is a software product that automates the import, processing, and filing of sales & use taxes to local, county, state, and federal jurisdictions across the entire U.S. It reduces the complexity of the sales & use tax filing process generating signature-ready tax returns for distributors, suppliers, and other filers. Tax Compliance lowers operational costs and improves filing accuracy and reliability minimizing business and compliance risks.

Phone Number: (855) 550-9313


NOTE:  Neither the State of Connecticut nor any of its employees, makes any warranty, express or implied, including the warranties of merchantability and fitness for a particular purpose, or assumes any legal liability or responsibility for the accuracy, completeness or usefulness of any information, apparatus, product or process disclosed, or represents that its use would not infringe privately owned rights.

The State of Connecticut is not responsible for the contents of any off-site pages referenced through links. The responsibility for contents rests with the organizations who are providing the information.  Specific details regarding a document should be directed to the appropriate organization and not necessarily to the State of Connecticut Web site administrator.