No, You messed up big time. The TurboTax online editions are only for tax year 2019. So now the IRS is going to receive your 2018 tax data on a 2019 tax return. If you are very lucky the IRS will reject the tax return and then you can delete all the information on the 2019 tax return and start over using 2019 tax data.
If you are unlucky the IRS will accept the return and then in a few months send you a letter complaining about what was entered on the 2019 tax return. You will then have to file an amended tax return for 2019 to make the corrections. An amended tax return can only be printed, signed, dated and mailed by you to the IRS, it cannot be e-filed. The IRS will take up to 4 months to process the amended tax return.
To complete and file a 2018 tax return using TurboTax you would need to purchase, download and install on a personal computer, Win or Mac, one of the 2018 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
A 2018 tax return can only be printed and mailed, it cannot be e-filed.
