You have to amend the return for 2018 to correct the error. You can follow these instructions to do that:
1. Log into your TurboTax program
2. Find "Your Tax Return & Documents" on your home page
3. Click on the "Show" option
4. Select the year you want to amend
5. You will see an option to "Amend(change)" the return for that year.
6. Just follow the instructions to start the amend process.
What you do is go back to the entry that you made incorrectly and then change it. You will be asked to type an explanation of why you are amending the return. Once you are done, you must print the return out, sign it and mail, along with a check for any tax due.
For 2019, just indicate that you didn't make an excess contribution for the previous year, since you corrected that with the amended return.
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