There could be numerous reasons that you wouldn't get the full amount of your refund....the most common is that it was offset due to debts owed such as child support, school loans and even state taxes.  Unfortunately there is no way for TurboTax to know why you wouldn't receive a refund.  If your taxes were offset then you will be receiving a letter from the IRS explaining the reason for the offset.  What you can also do is contact the IRS at 800-829-1040.  Also you should contact your state department of revenue because they will have more info on why the refund wasn't what was expected.