To calculate estimated tax payments needed for the current tax year (available to be done only with the early release version of the software):
Once the final filing version of the TaxAct software is released in January, you are only able to complete estimated tax information (or print vouchers) for next year's return (i.e. when the final filing version of the 2020 TaxAct program is released in January 2021, you can only calculate or print vouchers for payments to be made for the 2020 tax return and can no longer use the 2019 software to create a voucher or estimate the payment needed for 1/15/20).
In order to calculate the payment for 1/15/20 or print the voucher, use your 2019 TaxAct program. You would then have the option to print the voucher to mail the payment to the IRS or use EFTPS Online.
Note that any link in the information above is updated each year automatically and will take you to the most recent version of the document at the time it is accessed.