Since you failed to remove the excess before the due date of the 2018 tax return, you owe a 6% excess contribution penalty for 2018. That will require that you amend 2018, report the excess on a 2018 5329 form that will calculate 6% penalty.
That 6% penalty repeated in 2019 since you also failed to remove the excess before Dec 31, 2019. You also need to file an amended 2019 tax return reporting the excess that remained in 2019 and file 1 2019 5329 that will calculate the 2019 penalty.
To avoid another 2020 penalty, the excess must be removed as a normal Roth distribution before Dec 31, 2020. You will receive a 2020 1099-R with a code J in box 7 if under age 59 1/2. That distribution will not be taxable since you are removing your own contribution. Any earnings attributed to the excess will remain in the IRA because the penalties are paid.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
