If you filed and said that someone else could claim you as a dependent, and that is not true, then you should file an amended return. Unfortunately, the IRS is not processing paper-filed returns at this time. All amended returns are paper-filed, the IRS is accepting them but not processing them. Normally an amended return would take 6 weeks to be processed but there is no telling how long it would take now.
The stimulus payment is an advance on a tax credit for the 2020 tax year. If you are claimed as dependent in 2019, but not in 2020, you will not receive a stimulus payment this year but will receive one when you file your taxes next year.
@Totat99
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