We can tell you some things to check.
First of all, are you supposed to get both a Federal refund and a State refund? If so, which one did you get? They come in separate deposits. So do not go by the total amount. For a Federal refund, look at the amount on your Form 1040, Line 20a.
Did you have any TurboTax fees that you chose to pay out of the Federal refund, and are you taking that into account? Also be aware there is an additional 39.99 service fee for that option (44.99 for California filers.)
If it was the IRS that reduced your refund, you should get a letter from them in about 3 weeks or so explaining why.
