If you're about to mail your 1040-NR Federal income tax return and you wonder which address to choose, please read the information below:
1. If you wish to file your Federal tax return using a Private Delivery Service (FedEx, DHL Express or UPS) you should choose the address that is on the right side (Austin - Internal Revenue Submission Processing Center 3651 S IH35, Austin, TX 78741, USA).
2. However, if you will be using any other delivery service that is not one of the mentioned above, you need to mail your return to the address displayed on the left (Department of the Treasury Internal Revenue Service Austin, TX 73301-0215, USA).
Important: It's recommended that you request a tracking number from your postal service so that you could keep up with the status of your delivery.