Although you may have previously filed with TurboTax, they don't save a copy of your W-2.
How can I get a copy of my W-2?---------------------------------
If you are looking to print a copy of your prior year return & you used the Free Edition you would need to add Plus in order to print prior year returns. You don't need to add PLUS to print your 2018 return.
How do I access my prior year (2017) return?
