Deadline to file La. taxes is Wednesday May 13, 2013 at 6:10 PM CDT - Updated July 25 at 8:41 PM (Source: MGN Online) BATON ROUGE, La. (AP) - The deadline for filing 2012 Louisiana individual income tax returns is Wednesday. The state Department of Revenue says filing can be made electronically and more information is available at the department's website, www.revenue.louisiana.gov/fileonline. Officials say the average refund processing time for electronic returns is 10 business days; for paper returns it's 12 to 16 weeks. Taxpayers needing more time to prepare 2012 individual state income tax returns must submit an extension request by May 15 to avoid late-filing penalties. More information on extensions is available online at www.revenue.louisiana.gov/extensions.(Copyright 2013 The Associated Press).