The payment must not be reported in the Deductions & Credits tab even after starting the Amended Return. This section is exclusively for tax payments made in 2020, not for 2020.
To pay additional tax due with filing the amendment, tell TurboTax this preference in the Other Tax Situations section under Additional Tax Payments. The first option is Underpayment Penalties and will fill out Form 221 for you. You can select the option for IRS to bill you later or to pay it now.
The time to record payment details will still not be in this location, but when entering payment information when filing your return. And, the options of Direct Pay and EFTPS would still be valid alternatives to pay more than the exact balance.
Just to review, in order for Form 1040-X to be filled out correctly, the form must begin with the original filing. If changes were made before the amend(change) was begun, then Form 1040-X will change the original and will not document the change.
- If this has occurred, then go back in and delete all changes since filing. Then, follow these steps:
- From Tax Home, scroll down to Your tax returns & documents.
- Select Amend(change) my return.
If you are correcting something because the return was rejected, this does not require amending since the IRS rejected the original filing. In that case, see: How do I fix a rejected return?
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