The State of Delaware computer systems have been affected by a global IT outage. Our offices are open, but services are limited. Please be aware our tax portal is currently offline due to the IT outage. More Info logo
Division of

Vendor Registration

The Delaware Software Provider Letter of Intent (LOI) is currently available. Delaware is using the FTA State Exchange System (SES) to distribute the LOI, XML schemas, Test Packets, MeF Handbooks, Forms, Instructions, and other files.


Modernized E-File & Paper Forms

For software vendors who do not have access to the DE FTA State Exchange System, please contact to request access. Here you will find the Delaware Software Provider Letter of Intent. In your request, you should include the email address of the SES authorized user who plans to access the LOI.

Delaware releases XML schemas and test packets in late October.

Delaware begins acceptance testing for all tax types mid November. Tax year production will begin in conjunction with the IRS tax year startup date.

For additional information with modernized e-file development and testing, please contact

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