As currently written in the American Rescue Plan Act of 2021, the third stimulus will be based on the 2020 income tax return. If your return has not been filed and/or processed by the time the stimulus is out, the IRS will use 2019.
If, at the time of any determination made pursuant to paragraph (3), the individual referred to in paragraph (1) has filed a return of tax for the individual’s first taxable year beginning in 2020, paragraph (1) shall be applied with respect to such individual by substituting ‘2020’ for ‘2019’.
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