Sorry--you are too late to use TurboTax for 2018 or for 2019. The software for those years is no longer available, nor would it be supported or updated even if you can find it on eBay, etc. And.....no refund will be issued by the IRS for those years. Refunds of tax years earlier than 2021 have now been forfeited. If you owe tax due, however, it is owed with late filing penalties and interest which will continue to add up.
You might want to seek professional paid tax help for your past year returns.
Sorry you can no longer use Turbo Tax to prepare or amend a 2019 return. Not Online and not using the Desktop program. You need to do it yourself or go to a local tax place or accountant.
If you have a simple return and want to file 2019 for free you can fill out the forms by hand. Here are some basic forms.....
Here is the 2019 1040 return
https://www.irs.gov/pub/irs-prior/f1040--2019.pdf
or if you want bigger type use 1040SR for Seniors,
https://www.irs.gov/pub/irs-prior/f1040s--2019.pdf
2019 Instructions https://www.irs.gov/pub/irs-prior/i1040gi--2019.pdf
2019 EIC and Tax Tables https://www.irs.gov/pub/irs-prior/i1040tt--2019.pdf
2019 Schedules 1-3
https://www.irs.gov/pub/irs-prior/f1040s1--2019.pdf
https://www.irs.gov/pub/irs-prior/f1040s2--2019.pdf
https://www.irs.gov/pub/irs-prior/f1040s3--2019.pdf
Don’t forget your state. And you will have to print and mail your returns. So be sure to attach copies of your W2s and any 1099s that have withholding on them. You have to mail federal and state in separate envelopes because they go to different places. Get a tracking number from the post office when you mail them for proof of filing.
And....online tax preparation and e-filing are now permanently closed until the 2024 software becomes available. Any past year returns that you need to prepare will require you to use the CD/download software on a full PC or Mac. And the returns have to be filed by mail.
Do you even have all of the documents you will need to enter and show your income—like your W-2’s and any 1099’s?
Each tax year has to be filed separately using the forms for the specific tax year. They cannot be combined in any way--do not even put them in the same envelope when you mail them.
To file a return for a prior tax year
If you need to prepare a return for 2021, 2022, or 2023 you can purchase and download desktop software to do it, then print, sign, and mail the return(s)
https://turbotax.intuit.com/personal-taxes/past-years-products/
You may also want to explore purchasing the software from various retailers such as Amazon, Costco, Best Buy, Walmart, Sam’s, etc.
Remember to prepare your state return as well—if you live in a state that has a state income tax.
When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS/state received the return.
Federal and state returns must be in separate envelopes and they are mailed to different addresses. Read the mailing instructions that print with your tax return carefully so you mail them to the right addresses.
2018
Here is the IRS 2018 Form 1040
https://www.irs.gov/pub/irs-prior/f1040--2018.pdf
And instructions https://www.irs.gov/pub/irs-prior/i1040gi--2018.pdf
2018 Tax and EIC Tables https://www.irs.gov/pub/irs-prior/i1040tt--2018.pdf
IRS 2018 Schedules 1 thru 6 (only if needed)
https://www.irs.gov/pub/irs-prior/f1040s1--2018.pdf
https://www.irs.gov/pub/irs-prior/f1040s2--2018.pdf
https://www.irs.gov/pub/irs-prior/f1040s3--2018.pdf
https://www.irs.gov/pub/irs-prior/f1040s4--2018.pdf