IDES opens for testing from Monday, 1 June 2015 at 12:00 EDT (UTC/GMT-4) to Monday, 8 June 2015 at 12:00 EDT. The test session will be open to users that have completed IDES enrollment (Link) by Thursday, 28 May 2015 at 5:00 PM EDT. Note: Use test data only. The test files should not contain any production data or personally identifiable information, such as a valid taxpayer number, account number, or social security number. Any production files submitted to the test environment will not be processed. Do not submit production files to the test environment or test files to the production environment.