What shoul I do if I received by mistake the 1200 USD for Covid-19?

Go to this IRS website and click on Question 69 for returning the payment - https://www.irs.gov/coronavirus/economic-impact-payment-information-center#returning

The thing is that I'm not a US citizen, I'm peruvian. I worked in the US four months, from december 2017 to march 2018.  My tax form was mistakenly filled so I appear as a US citizen in the tax system. Should I follow the same procedure (question 69)?

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@urbina98 wrote:

The thing is that I'm not a US citizen, I'm peruvian. I worked in the US four months, from december 2017 to march 2018.  My tax form was mistakenly filled so I appear as a US citizen in the tax system. Should I follow the same procedure (question 69)?

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Yes, you should return the funds based on the procedure.