5500 - US ELF: Error Code CSISU01

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IRS filing deadline update

The IRS MeF system is now processing returns, and the filing deadline has been extended to 11:59 PM on Wednesday, April 18, 2018. For the latest details, see UltraTax CS alerts and notices.

You must use the following attachment title for the attached, signed Form 5500 / 5500-SF, Pages 1 and 2: "Manually signed form 5500 or 5500-SF under e-signature option for service providers." If you use the "Other Attachment" title, the return will generate Error CSIUS01 while the e-file is being created in UltraTax CS.

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