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The above is a good answer. The problem now is for the records to be made available for filing the return by the deadline of October 15 that was understood by the now deceased taxpayer.  What's the approach on filing this if some records are available by that date but others are not? The person signing this return does not want to be held responsible with penalties, interest, etc. if not all of the deceased taxpayer's records are available.

Part 2 - The deceased taxpayer filed returns on time in all the previous years. The 2015 return was filed with an extension on October 15, 2016. Reviewing it there appear to be opportunities to amend it and for the estate to receive an additional refund. I presume from the above that the same person could file an amended return before October 15, 2019. Is that correct? This again means obtaining all the records that might be difficult to obtain by that deadline.  Are solution(s) available in this case of the matter of a deceased taxpayer, and getting all the records together?