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

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.

June 16, 2025

Suspects arrested, products seized and businesses closed in multi-agency vape crackdown

BATON ROUGE – A multi-agency state and federal crackdown on unauthorized vape products in Louisiana resulted in ten arrests and more than $1 million worth of illegal vape pens, pods, juices and other products taken off the streets.


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