Yes, you can go back and file a 2017 1040X or a 2018 1040X to amend your return. If you used TurboTax, you can go back and log into your old return to file the amended form. However, no matter which way you do it, you will need to print and mail the form.
After you file and send in your payment, you will likely get a letter from the IRS stating that you owe additional interest in penalties on the overpayment.
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