4 installment dates? That sounds like the 4 quarterly estimated payments, not for your tax due. Are they the 1040ES forms? Your tax due is a Single 1040 V voucher unless you entered your bank account for the IRS to pull it out.
The 1040ES are estimates for next year. The 1040ES quarterly estimated tax payments DO NOT get sent to the IRS or state with your return. They are optional to pay. If you paid any be sure to manually enter it on your 2021 return next year.
