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The Electronic Management System (EMS) is a critical infrastructure project located at the front end of the IRS electronic filing (e-File) systems. It receives Federal and state tax return files from Trading Partners via external transmitters. After validating transmission information, EMS makes the Federal returns (Forms 94x, 1040, 1041 and some stand alone tax documents) available for processing by IRS back end e-file processing systems. It makes the state returns (forms 1040 and 1041) available for participating states to retrieve and process, and allows the states to send EMS acknowledgement files for the originating transmitter of the state return to retrieve.