The deadline for submitting timely filed 1065 Partnership and 1120S Corporation tax returns and extensions is Thursday, March 15th, 2018. Returns and extensions will be considered timely filed if they are postmarked by March 15th or electronically filed by midnight on March 15th. To ensure that all transmissions are considered timely filed, please have all returns and extensions submitted to TaxSlayer Pro no later than 11:59 PM your local time on Thursday, March 15th. We advise finalizing and transmitting any 1065 or 1120S returns or extensions well before the midnight deadline.
If you are filing an extension (Form 7004) for a Partnership or S Corporation, the automatic extension extends the deadline for filing the return until September 15, 2018. It does not extend the payment deadline. To include an electronic payment with the extension, fill out the Form 7004 Electronic Payment information in the Electronic Extension E-File Menu in the return.