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@lbones wrote:

 I am running out of time as my extension expires on 9/15/23. 

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You are not running out of time, the client is running out of time.  Just because the client has been dragging their feet doesn't mean that you should worry about it.  Don't let your client stress you. 

I assume you have told the client YOUR deadline (which is likely before the IRS deadline), and leave it in their hands to see if they give you the required information on time.