Scheduled IRS MEF System Downtime: Sept 14, 7:00 AM – 8:00 PM EST (Delayed Acknowledgements) Posted on 09/13/202409/13/2024 by Jeffrey Ruiz Attention: The IRS Modernized e-File (MEF) system will be down for maintenance on Saturday Sept 14 from 7:00 am until 8:00pm EST. Submissions can continue to be sent but acknowledgements will be delayed. Read More