A short-term transaction involves the sale of a security held for one year or less. A long-term sale involves a security held for more than one year, i.e. one year plus one day. You determine whether a sale is short-term or long-term by looking at your purchase date and comparing that to the sale date.
Because long-term capital gain rates are more tax friendly than short-term rates, you may want to check your 2020 return and if you reported sales as short-term that should have been reported as long-term, then you will probably want to amend your tax return.
If you used TurboTax online for tax year 2020, sign back into your TurboTax account, and from the Tax Home screen, scroll down to the lower part of the screen, select 2020, then select Amend (change) return and follow the on-screen instructions.
Here is a link to an IRS webpage that discusses capital gains, and short-term and long-term transactions. You may find this informative.
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