https://www.irs.gov/newsroom/more-details-about-the-third-round-of-economic-impact-payments
Generally, if you are a U.S. citizen or U.S. resident alien, you are eligible for the full amount of the third Economic Impact Payment if you (and your spouse if filing a joint return) are not a dependent of another taxpayer and have a valid Social Security number (see exception when married filing jointly) and your adjusted gross income (AGI) on their tax return does not exceed:
Payments will be phased out – or reduced -- above those AGI amounts. This means taxpayers will not receive a third payment if their AGI exceeds: