Yes you can. The 2020 filing deadline is Monday, May 17, 2021---unless you are in TX---folks in TX have until June 15 due to the winter storm. Some words of caution---waiting until the last minute to file is not a great idea. If anything goes wrong and you are unable to transmit your return or it gets rejected etc.--- bring up against the deadline makes it even more stressful. Give yourself enough room to breathe.
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