Tax year 2025 Forms 1045 and 1139 Modernized e-File (MeF) Assurance Testing System (ATS) information

The tax year 2025 1045 and 1139 Modernized e-File (MeF) Assurance Testing System (ATS) information is contained below.

If you support these forms, you will need to contact the e-Help Desk for testing. Please monitor this page for any ATS Scenario updates.

TY 2025 1045 MeF ATS scenarios

For information and questions regarding ATS, please contact the e-Help Desk at 866-255-0654.