To claim a refund for a previous tax year, you’re typically required to file an amended return within three years of the original filing date or within two years of the date you paid the tax, whichever is later. Therefore, you cannot amend your 2020 tax return unless, for example, you filed it late, and made payments within the past two years that you believe were in error.
See this TurboTax tips article for more information.
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