Tax year 2026 Forms 1045 and 1139 Modernized e-File (MeF) Assurance Testing System (ATS) information

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The tax year 2026 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 2026 1045 MeF ATS scenarios

1045 MeF ATS scenario 1 (1045IND) PDF

TY 2026 1139 MeF ATS scenarios

1139 MeF ATS scenario 1 PDF

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

Modernized e-File (MeF) Assurance Testing System (ATS)