We do not know whether the IRS will want us to provide this information.
The IRS says that the only way to update your mailing address and banking information is by filing your 2020 Federal 1040 tax return. The IRS is making no portal available.
Even if your 2020 Federal 1040 tax return is accepted, we do not know whether the IRS will issue a third stimulus payment using 2019 tax information or 2020 tax information.
This TurboTax Help states:
Do I need to do anything to get my stimulus check?
You don’t need to do anything to get your stimulus check. The IRS will determine eligibility based on your last tax return (either 2019 or 2020) and will likely send your payment to the bank account where your tax refund was deposited.
We do not know what direction the IRS will take in your situation.
Follow the TurboTax COVID Tax Center and the IRS Economic Impact Payment Information Center as further updates are issued by the IRS.
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