File an amended return if the IRS accepted your return and you owe additional tax. The longer you wait, the more penalty and interest will accrue.
It may be a while before the IRS corrects your return if it’s been accepted.
If you used TurboTax Online, simply log in to your account and select “Amend a return that was filed and accepted.”
If you used our CD/download product, sign back into your return and select “Amend a filed return.”
See How to Correct Federal Tax Returns and How do I amend my federal tax return for this year?
If the IRS bills you for penalty and interest after they accept your amended return, you can file for first-time penalty abate.
See Penalty Relief due to First Time Abate or Other Administrative Waiver.
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