Tax Year 2016: I cannot find the closing documents for the home that I sold in 2016. So I don't know how to figure out the Adjusted basis of home sold, What can I do?

If possible, you can try to contact the real estate agent, lender, or title company to get a copy.  They might have it.  Otherwise, the best you can do is enter your purchase price with your best estimate of the purchase date.  Then, to adjust the basis to include any permanent improvements over the years.  Reduce the basis amount by any depreciation "allowed or allowable" if you used it for business or a rental. 

Also, you can include the sales expenses listed below.

Sales expenses are listed in the sellers column of your settlement statement and include:

• commissions
• appraisal fees
• broker's fees
• legal fees
• advertising fees
• home inspection reports
• title insurance
• transfer taxes or fees
• geological surveys
• loan charges (points) or other fees paid on the buyer's behalf
• any fees for a service that helped you sell your home without a broker (listing fees, promotional fliers, etc.) 

Sales expenses do not include:

• mortgage payoffs
• home equity loan payoffs
• rent-back costs
• payoff to creditors
• property taxes
• home owner association fees

Is the Sale of My Main Home Taxable?

https://ttlc.intuit.com/replies/3300213