You are not paying through a "portal" from TT if you enter credit card information into the software to pay your tax due. TT is not involved. TT only passes that information on to the IRS or state. TurboTax does not pay your tax for you. TurboTax never knows when or even if you pay your tax due. TT receives no information from the IRS or state after they accept your return for processing.
Re-read the information given to you in the earlier reply. There are a variety of ways in which you can pay your tax due, including by paying directly on the IRS or state's tax sites.
You can just tell the software that you will pay by check. Then go ahead and pay by whatever means you choose to use.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
