If I need to re-file my taxes in 2018 due to a dependent care election that I wasn't eligible for, what forms would I use? What is the penalty?

[rjs · Accepted solution]

You don't "re-file" your tax return. If you already filed a tax return that contains an error, you have to file an amended return to make the correction. An amended return has to be filed on a special form, Form 1040X. It cannot be e-filed. You have to print it, sign it, and file it by mail. It takes the IRS up to 16 weeks to process an amended return.

Don't file the amended return until your first return has been accepted and you have received the original refund.

Go to the following link for instructions to amend a 2018 tax return that you filed with TurboTax.

https://ttlc.intuit.com/questions/4667233-how-do-i-amend-a-2018-return-in-turbotax

If you owe additional tax on the amended return, just pay the amount owed that is shown on the return. The IRS will send you a bill for interest and penalties after they process your amended return. It is not possible to calculate the interest and penalty in advance because it depends in part on exactly when the IRS receives your payment.