This is an old post and no longer accurate. The payment screen is still misleading and inaccurate.
You will be double charged with a pending g charge if you run your card again. If the IRS accepts the first charge, and they may, you may be waiting for the second to cancel or be returned 3 or more weeks later.
These are the facts from a call with TurboTax and the IRS. If money is tight, best to send a check with a note to cancel the pending card transaction and use the check.
Good luck.
