text: It depends on the situation.  Do you have any dependents under the age of 17?  If so, did you take the Child Tax Credit on your return?  $1000.00 is the amount available for the Child Tax Credit.  In any case, if you made a mistake on your original return, they will send you a letter explaining the changes soon after your direct deposit.  If you do not receive this letter withing 2 weeks of the refund (or if you want top verify right away), call the help line at 1-800-829-1040, Monday through Friday from 7:00AM - 10:00PM.  Let them know that you received more than you expected and they will check you account for you and give you any information you need.  Have: Your SSN, EXACT Refund Amount and Filing Status handy.  Good Luck.