What does ACH mean? Should i put the ABA number of my check or ACH number? They are different.

ACH stands for Automated ClearingHouse. ACH is an electronic funds-transfer system that facilitates payments in the U.S.

 

To receive your IRS refund by direct deposit (using the ACH system), you need to enter the following:

* Your bank routing number

* Your bank account number

 

Please see this IRS webpage which describes (with pictures) what you need to enter.