Louisiana individual income tax returns that include a payment are mailed to Louisiana Department of Revenue, P.O. Box 3550, Baton Rouge, LA 70821-3550, according to the Louisiana Department of Revenue. The address is valid for original and amended returns that include a payment.
Original and amended individual income tax returns sent without a payment are mailed to Louisiana Department of Revenue, P.O. Box 3440, Baton Rouge, LA 70821-3440, notes the Louisiana Department of Revenue. Individual income tax returns filed by mail take eight to 10 weeks to process, and returns selected for review take up to 16 weeks to process. Individuals can check the status of a refund online at Revenue.Louisiana.gov by clicking the Where's My Refund link under the For Individuals heading on the left of the home page.