If you filed a 2019 federal tax return, the only way to change it would be to amend it. The IRS is not currently processing paper-filed returns, so it is difficult to predict how long it will take for them to process the information. Generally, it takes about 6 weeks to process an amended return, however, it may take considerably longer now.
You will need to wait until the IRS has accepted your original return before filing the amendment. If you are to receive a refund, wait until you receive it before filing the amended return. If you owed the IRS money, then wait for your payment to clear.
For TurboTax Online, simply login 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.
You can find out more about amending a return here.
The IRS will use your 2019 federal return information to process your stimulus payment. If you need to change your banking information, you will need to wait for the Treasury to set up the web portal to do so.
"In the coming weeks, Treasury plans to develop a web-based portal for individuals to provide their banking information to the IRS online so that individuals can receive payments immediately as opposed to checks in the mail."
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