If you have already submitted your tax return, you will have to wait until Feb 12 when the IRS opens the gate. You cannot return to the program to make any changes before that.
If your return got rejected for whatever reasons, you can return to the program to make your correction along with other changes. You do not need an amendment 1040-X.
If your return has been accepted, you will have to amend your return by filing a form 1040X. You should not try to amend your return until it has been fully processed and you have received your refund or your payment has cleared.
Beginning with the 2019 tax year, you can e-file amended tax returns. If you used TurboTax to prepare Form 1040-X, follow the software's instructions to e-file the amendment.
To see how to amend your taxes, click here:
Steps to amend in TurboTax
How to file amendment
If you are referring to the estimated taxes you have paid in 2020, here are the steps:
- Sign back into the program and select Pick up where you left off
- At the right upper corner, in the search box, type in estimated tax payments and Enter
- Select Jump to estimated tax payments
- Follow prompts
If you are referring to adjust your Form W-4 to estimate your future taxes, here are the steps:
- From the upper right menu, select Search and type in w4 and Enter
- Select the Jump to w4
- Follow prompts
For more information, click here:
https://www.irs.gov/individuals/tax-withholding-estimator
https://turbotax.intuit.com/tax-tools/calculators/w4
If at filing time, you have not paid enough income taxes through withholding or quarterly estimated payments, you may have to pay a penalty for underpayment. To learn more, click here: Estimated Taxes
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