Louisiana Income Tax Calculator - Estimate Your LA State Tax
Enter your federal adjusted gross income, filing status, and tax year into the Louisiana income tax calculator to see Louisiana taxable income and state tax at the flat Louisiana rate after the standard or itemized deduction.
Louisiana Income Tax Calculator
Results
What Is the Louisiana Income Tax Calculator?
The Louisiana income tax calculator estimates the state income tax you owe to Louisiana for tax years 2024 through 2027. You enter your federal adjusted gross income, your filing status, and the tax year, and the tool applies Louisiana's flat state rate to your Louisiana taxable income after deductions. Louisiana is a flat-tax state, so every dollar of taxable income is taxed at the same rate rather than across graduated brackets.
- • Estimate a Form IT-540 balance due: Run your numbers before filing so you know whether to expect a refund or a payment.
- • Compare tax years: See how the scheduled rate phase-down from 3.00% in 2024 to 2.65% in 2027 changes your bill.
- • Decide standard vs itemized: Check whether itemizing your federal Schedule A deductions lowers your Louisiana tax.
- • Model the retirement subtraction: Confirm how much the Louisiana Social Security and retirement exclusion removes from your taxable base.
Louisiana rebuilt its individual income tax around a single flat rate beginning with tax year 2024. That means the marginal rate and the effective rate move together, which makes planning simpler than in bracket-based states.
This calculator focuses on the state portion only. Your federal liability is a separate calculation, and because Louisiana starts from your federal AGI, the two returns are linked.
Because Louisiana builds its tax base from your federal return, start with the federal income tax calculator to estimate the federal side first.
How the Louisiana Income Tax Calculator Works
The calculator follows the same path the Louisiana Department of Revenue uses on Form IT-540: start with federal adjusted gross income, subtract Louisiana-only items, subtract a deduction, then multiply by the flat rate.
- Federal AGI: Your adjusted gross income from IRS Form 1040, line 11.
- Retirement / Social Security Subtraction: Louisiana-taxed Social Security and retirement benefits you remove from the base; Louisiana does not tax them.
- Standard / Itemized Deduction: The larger of the Louisiana standard deduction (which follows federal amounts) or your federal Schedule A total.
- Flat Rate: 3.00% (2024), 2.90% (2025), 2.75% (2026), or 2.65% (2027).
Louisiana starts from federal AGI because the state form is built on top of your federal return. Most federal income stays in the Louisiana base, but a few state subtractions come out first.
After subtractions and the deduction, the remaining Louisiana taxable income is multiplied by the flat rate for the year you selected. The result is your Louisiana income tax before any credits.
Single filer, 2025, $60,000 AGI
Federal AGI $60,000, single, tax year 2025, no retirement subtraction, standard deduction $15,000.
Louisiana taxable income = 60,000 - 0 - 15,000 = 45,000. Tax = 45,000 x 2.90% = 1,305.
Louisiana income tax = $1,305.
The effective rate on total AGI is about 2.18%, lower than the 2.90% flat rate because the standard deduction removes the first $15,000.
Married filing jointly, 2026, $120,000 AGI
Federal AGI $120,000, married filing jointly, tax year 2026, standard deduction $31,500.
Louisiana taxable income = 120,000 - 31,500 = 88,500. Tax = 88,500 x 2.75% = 2,433.75.
Louisiana income tax = $2,433.75.
The larger joint standard deduction pushes more income out of the base than a single filer would see at the same AGI.
According to the Louisiana Department of Revenue - Individual Income Tax, Louisiana begins its individual return with your federal adjusted gross income from Form 1040 and then applies state subtractions and the flat rate.
According to the Louisiana Department of Revenue - Forms, the figures you enter come from your federal Form 1040 (line 11, adjusted gross income) and Schedule A before you complete Form IT-540.
If you need to find your starting number, the AGI calculator walks through the line-by-line adjustments that produce federal AGI.
Key Concepts Explained
Four ideas drive every Louisiana result. Understanding them helps you read the output and spot when to itemize or claim a subtraction.
Flat tax rate
Louisiana applies one rate to all taxable income. The rate is 3.00% in 2024, 2.90% in 2025, 2.75% in 2026, and 2.65% in 2027, scheduled by state law.
Federal AGI as the base
Louisiana taxable income begins with your federal AGI. Federal adjustments you already made flow into the Louisiana calculation, so the two returns stay connected.
Standard vs itemized deduction
Louisiana uses the federal standard deduction amounts and also lets you itemize using federal Schedule A. You take whichever is larger.
Retirement / Social Security subtraction
Louisiana exempts Social Security benefits and certain retirement income from state tax. Subtract any federally taxed benefits to keep them out of your Louisiana base.
These concepts explain why two filers with the same AGI can owe different Louisiana tax: filing status changes the standard deduction, and itemizing or a retirement subtraction changes the base.
Louisiana is one of several flat-tax states; compare your result with the Colorado income tax calculator to see how a neighboring flat rate differs.
How to Use This Calculator
Follow these steps to get a reliable estimate. Have your federal return or a draft AGI handy before you start.
- 1 Enter federal AGI: Type your adjusted gross income from Form 1040, line 11. This is the starting point for Louisiana.
- 2 Pick filing status: Choose single, married filing jointly, head of household, or married filing separately. This sets your standard deduction.
- 3 Select tax year: Choose 2024 through 2027 to apply the correct flat rate for that year.
- 4 Add the retirement subtraction: If your federal AGI includes taxed Social Security or retirement income, enter that amount so Louisiana removes it from the base.
- 5 Choose standard or itemized: Use the standard deduction, or switch to itemized and enter your Schedule A total to compare.
- 6 Read the results: The tool shows Louisiana taxable income, the flat rate, your tax, and the effective rate as you change inputs.
A single W-2 earner with $60,000 AGI and no retirement income selects 2025, leaves the subtraction at 0, and uses the standard deduction. The calculator returns $45,000 of Louisiana taxable income and $1,305 of tax, which matches the worked example above.
For a regional comparison, the Arkansas income tax calculator shows how a bordering state with different brackets handles the same income.
Benefits of Using This Calculator
Beyond a single number, the Louisiana income tax calculator helps you make specific decisions before you file, from adjusting withholding to timing a retirement subtraction.
- • Plan withholding and payments: Estimate your IT-540 balance early so you can adjust withholding or set aside money for a payment.
- • Compare tax years: See how the phase-down from 3.00% to 2.65% affects your bill across 2024 through 2027.
- • Test the itemizing choice: Toggle itemized vs standard to learn which deduction lowers your Louisiana tax.
- • Value the retirement subtraction: Quantify how much the Louisiana Social Security and retirement exclusion saves a retired filer.
- • Model life changes: Run 'what if' scenarios for a raise, marriage, or a second income before they happen.
Because the flat rate is the same for everyone, the biggest levers on your bill are the deduction choice and any subtractions, which the calculator makes easy to test.
Once you know your tax, pair it with the annual income calculator to see what your take-home pay looks like across the year.
Factors That Affect Your Results
Several inputs shift your Louisiana tax. The Louisiana income tax calculator is most useful when you enter each of them accurately, so knowing what moves the number helps you avoid surprises at filing time.
Filing status
Married filing jointly and head of household receive larger standard deductions than single or married filing separately, lowering taxable income.
Itemized deductions
If your Schedule A total beats the standard amount, itemizing removes more income from the Louisiana base.
Retirement / Social Security subtraction
Retirees with taxed Social Security or retirement income can subtract them entirely, which can drop taxable income by several thousand dollars.
Tax year
The flat rate falls from 3.00% in 2024 to 2.65% in 2027, so the same income owes less in later years.
Other state subtractions
Louisiana allows additional subtractions beyond retirement income; this calculator models the most common one, so unusual items may change your real bill.
- • This tool estimates individual income tax before credits. Louisiana tax credits you qualify for are not included and could lower the final amount.
- • Standard deduction amounts are indexed for inflation; 2026 and 2027 figures are based on current law and may adjust slightly before those returns are due.
Treat the output as an estimate for planning, not as a substitute for the official Form IT-540 prepared from your actual documents.
As published by Louisiana Department of Revenue - Individual Income Tax, Louisiana computes individual income tax on Form IT-540 beginning with federal AGI and applying the flat rate after the standard or itemized deduction.
Social Security treatment varies by state; the Mississippi paycheck calculator shows how a nearby state without an income tax handles take-home pay instead.
Frequently Asked Questions
Q: What is the Louisiana state income tax rate?
A: Louisiana uses a single flat individual income tax rate. For tax years 2024 through 2027 the rate phases down: 3.00% in 2024, 2.90% in 2025, 2.75% in 2026, and 2.65% in 2027. Every dollar of Louisiana taxable income is taxed at the same rate; there are no progressive brackets for individuals.
Q: Does Louisiana tax Social Security benefits?
A: No. Louisiana does not tax Social Security retirement benefits, and it also excludes certain other retirement income from state tax. If your federal AGI includes Social Security that was taxed on your federal return, you subtract that amount on the Louisiana return, so it is removed from your Louisiana tax base before the flat rate is applied.
Q: What is the Louisiana standard deduction?
A: Louisiana conforms to the federal standard deduction. For tax year 2025 the amounts are $15,000 for single and married filing separately, $30,000 for married filing jointly, and $22,500 for head of household. If your federal Schedule A itemized deductions are larger, you can itemize instead.
Q: How is Louisiana taxable income calculated from federal AGI?
A: Louisiana starts with your federal adjusted gross income, subtracts Louisiana-only items such as the retirement and Social Security subtraction, then subtracts the larger of your Louisiana standard deduction or your itemized deductions. The remaining amount is Louisiana taxable income, which is multiplied by the flat rate for your tax year.
Q: Does Louisiana have a local or city income tax?
A: No. Louisiana has no local, city, or parish income tax on wages or salaries. Only the state flat rate applies to your Louisiana taxable income, so the number from this calculator is your full Louisiana income tax.
Q: When is the Louisiana state return (Form IT-540) due?
A: The Louisiana individual income tax return, Form IT-540, is generally due May 15, which is later than the federal April 15 deadline. For tax year 2024 the Louisiana flat rate is 3.00%, applied to your Louisiana taxable income after deductions.