To simply file your 2020 return without the previous years would be incorrect.
To accurately file your taxes you will have to file amended returns starting with 2017. The profit and loss for each year will be different, and that is the only way to get it correct.
Although cryptocurrencies are similar, the are not the same. FedEx and UPS are similar, but they are completely different stocks. Likewise, each cryptocurrency is different.
You can file a 2017 amended return up to 04/15/2021.
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