Tax Year Prior to 2020: Inherited non-covered shares of stock in 2013. Sold all shares in 2020. Stock also split in 2014. How do I go about reporting this information using Turbo Tax Premier?

[VictorW9]

Check this resource about: How to value inherited split stocks

[Rick19744]

While the link may be helpful, let's address your specific question:

• You inherited stock in 2013.  At that time, your basis in the stock is the FMV at date of death.  This FMV is determine by taking the average of the highest selling price and the lowest selling price of the stock on that date. 
• In some circumstances an estate can use the alternate valuation date, but clearly not sufficient facts to determine if that is an option; doubtful this is available.
• As an example, let's say you determined the FMV on the date of death ( as explained above) to be $25 share and you inherited 200 shares of stock.  Your basis in the stock is $5,000.
• Now in 2014 the stock split (no facts on what the split was, but the concept is the same).  Let's say the split was 2:1.  So now you own 400 shares of the stock and your basis is still $5,000; your per share cost is now $12.50.
• At this point you would report the sales price as reported on the 1099-B, your cost basis of $5,000 (assuming you sold all the stock), which gives you the gain or loss on the investment.  This is reported on form 8949 and Schedule D.  
• Make sure you maintain copies of the documents you use to determine the FMV on the date of death.