The Tax Year 2018 Modernized e-File (MeF) Assurance Testing System (ATS) test scenarios for Exempt Organizations returns are listed in the table below. Please see the MeF ATS page for the complete list of test scenarios for all forms supported by MeF. If you will support these Forms, you will need to contact the e-Help Desk for testing. Please monitor this page for any ATS Scenario updates. ATS Known Issues and SolutionsXLS: Issues identified with the test scenarios are listed on the TY2018 ATS Known Issues and Solutions document for the Form 990 family. MeF ATS Test Scenarios for Exempt Organizations Returns Form Type Tax Year Comments 990ZIP 2018 10-29-2018: ATS Known Issue posted. Scenarios 1 and 2 updated. 990-EZZIP 2018 990-PFZIP 2018 10-29-2018: ATS Known Issue posted. Scenarios 1, 2 and 3 updated. 990-NZIP 2018 1120-POLZIP 2018 8868ZIP 2018 Back to Exempt Organizations MeF XML Schemas