I received an IRS letter stating I hadn't claimed sales on my 2015 taxes for main home and a rental property. I am positive I entered those sales on my taxes. I cannot access the 2015 version software. The due date for payment is October 11, 2017.
See this TurboTax FAQ: https://ttlc.intuit.com/questions/1900748-how-do-i-get-a-copy-of-a-return-i-filed-in-turbotax-online
