Updated October 7, 2026. Quick answer: Generally no, if you qualify for the federal exclusion. Louisiana’s IT-540 starts from “Enter the amount of your Federal Adjusted Gross Income”, and a gain excluded under section 121 is not in it. Gain above the exclusion is taxed at a flat rate: “the individual income tax rate is a flat 3%”.
Louisiana tax on home sale profit at a glance
| Item | What the documents say |
|---|---|
| Profit on your main home | Starts from federal adjusted gross income, which excludes a gain excluded under section 121 (no document read mentions section 121) |
| Rate on gain above the exclusion | Flat 3% from 2025 |
| Collected at the sale | None found in the documents read |
| Source | Louisiana State Legislature; Louisiana Department of Revenue |
What the Louisiana documents say
La. R.S. 47:293 defines adjusted gross income as the amount “reportable on the individual’s federal income tax return”, and the 2025 IT-540 instructions begin with “Enter the amount of your Federal Adjusted Gross Income”. Under the federal statute, “Gross income shall not include gain from the sale or exchange” of a principal residence that meets the ownership and use tests, so an excluded gain never enters federal adjusted gross income. That is reasoning from two documents. Neither document mentions section 121 or a home sale.
On the rate, the Department says “the individual income tax rate is a flat 3%”, and the instructions note that legislation “changed the income tax rate to a flat tax rate of 3%”.
What the federal exclusion requires
Most state answers start here. The statute says “Gross income shall not include gain from the sale or exchange” of property that, during the five years before the sale, you owned and used as your principal residence for periods adding up to two years or more. The limit is “shall not exceed $250,000”, or $500,000 for a husband and wife who make a joint return and meet the statute’s conditions. See CMG’s home sale taxes page and exclusion calculator.
A worked example at a $400,000 gain
An illustration, not a return: a married couple in Louisiana sells their main home with a gain of $400,000 and meets the federal ownership and use tests. The gain is below the $500,000 joint exclusion, so it is not in federal adjusted gross income and, on the documents read, $0 is taxed by Louisiana. As a second illustration, computed below, suppose the gain were $600,000. The amount above the exclusion would then be $100,000 and, computed as that excess times 3%, the tax at the flat rate would be $3,000, before any other adjustment.
What is collected at the sale
The documents read show no Louisiana withholding, prepayment or seller-paid tax on a home sale. That is a gap in what was read, not a statement that none exists; ask the closing agent.
What changes in 2026
The documents read for Louisiana announce no change for 2026 that is specific to the tax on a home sale. The forms and instructions read are for tax year 2025 or the newest page archived; check the state agency for 2026 forms when they are published.
What the documents do not say
- No document read mentions section 121, so conformity is reasoned from the federal starting point. No sale-time rule was found. The instructions are for tax year 2025.
Common mistakes
- Assuming a separate Louisiana home-sale exclusion; the documents read start from federal adjusted gross income.
- Applying the flat rate to the whole gain; the rate applies to what remains after the federal exclusion.
- Assuming the answer for one state applies to another, or that the state answer changes the federal tax on the sale.
Related: home sale taxes, state tax on home sale profit, how Louisiana taxes capital gains, Louisiana retirement taxes, and home sale exclusion calculator.
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Answer againSources
- La. R.S. 47:293 Definitions: https://www.legis.la.gov/Legis/Law.aspx?d=101760
- What are the individual income tax rates and brackets?: https://revenue.louisiana.gov/tax-education-and-faqs/faqs/income-tax-reform/what-are-the-individual-income-tax-rates-and-brackets/
- 2025 Louisiana Resident Income Tax Return Instructions (IT-540): https://dam.ldr.la.gov/taxforms/IT540i-WEB-2025-Revised-7-26.pdf
- 26 U.S.C. 121, Exclusion of gain from sale of principal residence (U.S. Code, GovInfo): https://www.govinfo.gov/content/pkg/USCODE-2023-title26/html/USCODE-2023-title26-subtitleA-chap1-subchapB-partIII-sec121.htm
Sources: the primary documents linked above, read on October 7, 2026. General information, not tax advice. Your own facts decide the outcome, and a tax professional or the state agency itself is the right place to confirm anything consequential.