Overview
Louisiana underwent a significant overhaul of its income tax system effective January 1, 2025. The state transitioned from a multi-bracket progressive system to a single flat tax rate, simplifying withholding for employers and payroll administrators.
State Income Tax (SIT)
Effective January 1, 2025, Louisiana imposes a flat state income tax rate of 3.09% on all earned wages. The amount withheld is based on the employee’s filing status and the standard deduction they claim on Form L-4. Standard deductions are $12,875 for Single and $25,750 for Married Filing Jointly.
| Tax Structure | Flat rate: 3.09% (effective January 2025) |
| State Withholding Form | Form L-4 |
| Filing Statuses | 0, S, MFJ |
| Standard Deduction (Single) | $12,875 |
| Standard Deduction (MFJ) | $25,750 |
| SUTA Note | Default new employer rate is 0% (assigned by state) |
Supplemental Wages
Louisiana supports the following supplemental calculation methods. Supplemental wages such as bonuses and commissions will be calculated using the applicable method.
Employer State Unemployment Tax (SUTA)
Your assigned SUTA rate will be based on your company’s experience with unemployment claims. New employers typically start at the default rate of 0%.
| Tax Type | Employer-paid only |
| Default New Employer Rate | 0% |
| Rate Assignment | Experience-rated; assigned annually by the state |
Other Taxes & Obligations
Louisiana does not currently impose significant additional state-level payroll taxes beyond SIT and SUTA. This keeps payroll relatively streamlined compared to states with multiple layers of tax obligations.
Disclaimer: This content is provided for general informational purposes only and does not constitute legal, tax, or accounting advice. Netchex does not provide tax or legal guidance and makes no representations regarding the accuracy or applicability of this information. Laws and regulations may change. The information on this page reflects payroll tax guidelines as of March 2026. For the most current requirements, please refer to:
Official reference: Louisiana Department of Revenue
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