If you used the FULL SERVICE CPA then contact the CPA that signed your return.
If you used the DIY program ... see below ...
What is the TurboTax 100% Accurate Calculation Guarantee?
In plain English, if you pay an IRS or state penalty or interest because of a TurboTax calculation error, we'll pay you the penalty and interest.
For complete details, see our Intuit Software End User License Agreement (look about 2/3 of the way down the page, under the heading TurboTax Accurate Calculation Guarantee).
You can read the fine print at the Intuit Software End User License Agreement for TurboTax Desktop Software or the End User License Agreement for TurboTax Online. Enter accurate calculation in the Find feature in your browser (usually listed under Edit) to go to it quickly.
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