How are interest and penalties computed?


Prior to January 01, 2006, interest accrued at the rate of one and one quarter percent a month or 15 percent per annum from the date the return is required by law to be filed until the date the tax is paid. Beginning January 01, 2006 the rate of interest is subject to change annually. The rates can be found on the website by accessing form number R-1111. For Individual Income Tax: For failure to pay the tax in full by the date the return is required by law to be filed, determined without regard to any extension of time for filing the return, a penalty of 0.5 percent of the tax not paid accrues for each 30 days during which the failure to pay continues, not to exceed a total of 25 percent. For All Other Taxes: For failure to pay the tax in full by the date the return is required by law to be filed, determined without regard to any extension of time for filing the return, a penalty of 5 percent of the tax not paid accrues for each 30 days during which the failure to pay continues, not to exceed a total of 25 percent.

Filing Dates


News & Announcements

August 12, 2025

Guilty plea resolves fraud investigation related to Hurricane Ida recovery

A guilty plea in a Baton Rouge criminal court closes the investigation into a fraud case related to the recovery process following Hurricane Ida in 2021.

July 31, 2025

New penalties for Kratom in effect Aug. 1

Starting Aug. 1, 2025, severe new penalties are in effect for the possession of the herbal supplement known as Kratom. Kratom is sold often as an energy booster, pain reliever and mood lifter. Its potential harmful side effects include liver toxicity, seizures and death.

July 28, 2025

Millions in state tax refunds moving to Unclaimed Property if taxpayers don’t claim them

BATON ROUGE – Louisiana taxpayers have until Sept. 6, 2025, to claim millions of dollars in state tax refunds before they become unclaimed property.


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