But...can you use TTX software to help prepare his 2016 tax return?
Yes...you buy and use the download 2016 software, then fully update it. (or buy the CD, install, and update it as most CDs are only very crude preliminary copies)
Follow the directions below.....(You said you are taking in to an IRS office yourself, so you won't be following the mail-in directions)
https://ttlc.intuit.com/replies/6196779
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
