First, check with your financial institution to ensure they will accept a direct deposit for the type of account you are designating. Some financial institutions will accept direct deposits for some types of accounts, but not others.

Second, ensure you have the correct account and routing numbers for the account - ask your financial institution if you are unsure - and double check the accuracy of the numbers you enter on your tax return. An incorrect or transposed number could result in your financial institution rejecting the deposit, or worse, depositing your refund into someone else's account.

Third, double check your return to ensure you have not made math or other errors that could increase or decrease the actual amount of your refund. IRS recommends electronic filing for the most error-free return.

What if I entered the correct account and routing numbers, but IRS made an error in depositing my refund?

IRS will correct any agency errors. Contact an IRS customer service representative by calling 1-800-829-1040.

Source: www.irs.gov