After you file

If the forms that were printed were Forms 1040-ES those are used for making estimated tax payments for your 2020 taxes and are optional for you to use.  The Form 1040-ES is not reported to the IRS.

If the form was a Form 1040-V that is the payment voucher to be used when mailing a check to the IRS.  It is not used if you are having the federal taxes owed paid using direct debit from your bank account.