To revoke or cancel any EFW payment, contact the U.S. Treasury Financial Agent, toll-free, at 1-888-353-4537. Cancellation requests must be received no later than 8:00 p.m., Eastern Standard Time, at least two business days prior to the scheduled payment date. If there is a change to the bank account information provided on the return or form, call this number to cancel the scheduled payment. You may also call this number to inquire about the status of an EFW payment. You can also call 1-800-829-4933 ten (10) days after the requested payment date to confirm receipt of your payment. When calling, please be ready to provide the Employer Identification Number (EIN), the payment amount, and the bank account number.