What do you do if you received a stimulus check and weren't supposed to

There are no provisions to return any stimulus payments.  Most American citizens were and are eligible.  To recap here are the eligibility criteria.  You could have been eligible and received payments based on 2018, 2019, or 2020 returns.  Enjoy!

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:

• $150,000 if married and filing a joint return or if filing as a qualifying widow or widower
• $112,500 if filing as head of household or
• $75,000 for eligible individuals using any other filing statuses, such as single filers and married people filing separate returns.