The tax system is pay-as-you-go. For 2020 capital gains (income), you need to pay estimated income taxes for federal and state (if applicable) in the 2020 quarter you earned the income to avoid underpayment penalties.
You can pay your federal estimated taxes online or by sending a check or money order with Form 1040-ES. See Payments | Internal Revenue Service.
To pay your state estimated, visit your state's website try contacting your state Department of Revenue for more information.
Related information:
[Edited 3-10-2020|6:37 am PST]
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