When you use Online TurboTax, you get one return per fee. Each return needs its own account and user ID. If you use the same account and user ID for a second return, you overwrite the first one and lose it forever.
https://turbotax.intuit.com/personal-taxes/online/
Thanks that was helpful. I found a site off irs web page, free of charge for a 1040ez, basically.
You son most likely qualifies for the TurboTax (TT) free edition, online.
TT also sells download editions of their software. You can do an unlimited number of returns on the download programs. You're limited to five e-files (any additional returns would have to be printed and mailed).