Corporate extensions are due 9/15/19 which is why they have no time for you ... if you run into trouble and you did not file a corp extension then seek an appt after that date. The penalties for the late filing are piling up monthly so professional help may still be better than doing it wrong yourself.
And the QuickBooks Self Employed version will not work for the corp ... you need to purchase a regular Quickbooks program and I highly suggest the downloaded version over the online one.
