File your tax return as normal. The sale of your residence is not a part of your 2020 tax return, since you sold it in 2021. Also, if you have a gain on the sale of residence, the gain is not taxable unless your gain exceeds $500,000.00.. If you are a US citizen all of your income earned is taxable in the US for 2020.
If you are a Brazilian resident, your worldwide income will be subject to personal income tax at a progressive rate that peaks at 27.5%. If you are a non-resident, you are responsible for taxes only on Brazilian income at a rate of 25%, and you are not required to file an income tax return until you become a resident.
You have to file a U.S. income tax return while working and living abroad unless you abandon your green card holder status by filing Form I-407, with the U.S. Citizen & Immigration Service, or you renounce your U.S. citizenship under certain circumstances described in the expatriation tax provisions.
Use this link for more details: Frequently Asked Question for Internationals
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