I sold $x in stocks in Apr 2020 to pay tax for 2019 Tax. In 2021, will this $x in stocks be exempted from taxable income or should i pay tax on the tax paid ?

- does brokerage supports selling shares for tax payment that directly sends payment to IRS ?
- If not i sell shares for paying taxes and then that is considered as income for next year tax assessment.  Is there a way to avoid paying tax on tax ?