You are correct, you report income in the year you receive the compensation, so no income tax return need be filed for 2021. You will file your income tax return in 2022 dependent on the income reported to you on your W-2 form next year.
You would file the form 8843 if you meet the requirements based on Visa status under F-1, F-2, J-1 or J-2 status.
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