Enter the bank account number and routing number in the refund section of Form 1040. The IRS uses the account information on the current return only, so you can change the account number every time you file.
Call the IRS at 800-829-1040 if you discover you entered incorrect account information on your tax return. The IRS will issue you a refund check instead.
Fill out Form 8888, Allocation of Refund, if you want to split your direct deposit refund among two or three different bank accounts. Attach the form to your income tax return. You can't change the information on Form 8888 once you've filed your return, but you can call the IRS to request refund checks instead.