@kaelab98
Are you saying you mistakenly entered 2018 W-2 information into your 2019 return? Online TurboTax can only prepare a 2019 return at this point in time.
Did you already actually efile? Did you go all the way to the end, verified with your 2018 AGI, signed with today's date and your birthdate, and a final screen that has a big orange button to click "Transmit My Returns Now?"
If so, you won't know how to proceed until you hear if the IRS accepts or rejects the efiled return. It will be best for you if it's rejected, since that's the easiest scenario to fix. Then you can just correct it and resubmit the efile.
However, if your return is accepted, then the only way to correct it is by preparing a formal amended return Form 1040X.
The IRS won't start processing efiled returns until January 27, except for a few returns that are pulled early for testing purposes. So you may not know until January 27 (or soon after), if your efile was accepted or rejected.
In the meantime, do NOT make any changes in your return. Leave it exactly as it was when you filed it in case you have to prepare an amended return. When amending a return, you have to start off with it in the same condition as it was when originally filed.
