The Official Website of the Louisiana Department of Revenue
Nonresident and individuals who were part-year residents must report their income from all sources for the period during which they were a resident, plus all income from Louisiana sources for the period they were a nonresident.
Returns and payments are due on the 15th day of the fifth month after the close of the taxpayer's fiscal year. For calendar-year filers, the tax is due on May 15.
The tax is determined using tax tables furnished by the Department of Revenue. The tables use federal adjusted gross income tax as a reference point. The tables are based on the following:
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Every individual whose Louisiana income tax liability can reasonably be expected to exceed $1,000 ($2,000 if joint declaration), after deducting all credits, must file an estimated tax declaration. Underpayment of or failure to pay estimated tax may result in an additional amount due at the rate of 12 percent annually on the amount underpaid.