File and paid my federal taxes owed using Turbo Tax. However, month plus later, receive a note from IRS (CP23) that payment was deficient and still owe over $1600. How did this not get picked up in Turbo Tax or why was the federal tax amount calculated by Turbo Tax incorrect? Doesn't Turbo Tax guarantee their calculations and results. Makes me wonder about reliability of Turbo Tax. The IRS note cited no errors other than the amount paid with tax filing deficient, so very surprised by the IRS letter.
