I opted to mail my taxes in...sent in the mail today. I filled out my bank info on her when processing my taxes, but how will the IRS get that info if I did not e-file?

[AnnetteB · Accepted solution]

There is a section on the Form 1040 page 2 showing the routing number and account number to be used for direct deposit of a refund. 

If you had a balance due instead of a refund, the bank information is not included on the form.  You would need to either attach a check or make the payment in another way.