Bottom Line: If it's taxable you need to pay estimated taxes. See https://www.nerdwallet.com/article/taxes/capital-gains-tax-rates
or IRS.gov for rules, instructions and calculators.
If you are reasonably sure of your yearly income, interest and non qualified dividends you can pay the appropriate estimated tax (0,10 or 20%) on capital gains and qualified dividends. If you earn significantly more, or less than expected you can add funds to your account at IRS.gov online at any time.
For,
Earnings + Interest + Non Qualified Dividends < $40,000 Single or $80,000 Married
Capital Gains and Qualified Dividends are not taxed.
If,
Earnings + Interest + Non Qualified Dividends = $40,001 to $441,450 Single or $80,001 to $496,600 Married
Capital Gains and Qualified Dividends are taxed at 15%
For,
Earnings + Interest + Non Qualified Dividends > $441,451 Single or $496,001 Married
Capital Gains and Qualified Dividends are taxed at 20%
