TurboTax does not know why your refund was reduced by the IRS.
If you used the Refund Processing Service, that fee in addition to your TurboTax fees were deducted.
The reduction could have been due to a calculation error or a refund offset to pay a debt such as an outstanding student loan, past due state taxes, or past due child support.
In any case, you can expect an explanatory letter from the IRS within the next 30 days or so.
