A Louisiana state tax payment for individual income tax is due by May 15 following the tax year, calculated at a flat 3% of taxable income for tax years beginning in 2025 and later.1Louisiana Department of Revenue. Revenue Information Bulletin No. 25-012 – Louisiana Individual Income Tax Reform You can pay online through the Louisiana Taxpayer Access Point (LaTAP), by mailed check, or by credit or debit card through a third-party processor. Miss the deadline and you’ll owe a late payment penalty of 0.5% per 30-day period on top of interest, which the Department of Revenue set at 11.25% annually for 2025.2Louisiana Department of Revenue. Revenue Information Bulletin No. 25-001 – 2025 Interest Rate Collected on Unpaid Taxes
How to Pay Your Louisiana Income Tax
The Louisiana Department of Revenue accepts payments through its online portal, LaTAP, which lets you file returns, make one-time payments, enter into payment plans, and schedule future payments.3Louisiana Department of Revenue. File and Pay Online LaTAP is the primary system for both individuals and businesses. Older references to “Louisiana File Online” point to a system that has since been replaced.
To pay by mail, send a check or money order to the Department of Revenue with the correct payment voucher from the LDR website. Make the check payable to the Louisiana Department of Revenue and write your Social Security number or business account number on it. Mail well before the due date. The postmark controls whether your payment is timely, not the date it lands at the Department.
Credit and debit card payments go through a third-party processor that charges a convenience fee based on a percentage of the payment. The state does not set or receive that fee. On a large balance the fee adds up quickly, so an electronic bank transfer through LaTAP is usually the cheaper route.
When Payment Is Due
Louisiana individual income tax returns for calendar-year filers are due May 15 of the following year, not the federal April 15 date. An automatic six-month extension is available if you need more time to file, but the extension only delays paperwork. It does not extend the time to pay. Any tax owed is still due by the original May 15 deadline, and unpaid amounts start accruing penalties and interest the next day.
Quarterly Estimated Payments
If you expect to owe more than $1,000 in Louisiana income tax after subtracting withholding and credits (or more than $2,000 for joint filers), you must make quarterly estimated tax payments. The four due dates are April 15, June 15, September 15, and January 15 of the following year. Farmers and commercial fishers get a single January 15 deadline if at least two-thirds of gross income comes from farming or fishing, and they can avoid the underpayment penalty entirely by filing their return and paying in full by March 1.4Louisiana Department of Revenue. Declaration of Estimated Income Taxes
What You Owe at the Flat Rate
For tax years beginning January 1, 2025, Louisiana charges 3% on all individual taxable income regardless of filing status.1Louisiana Department of Revenue. Revenue Information Bulletin No. 25-012 – Louisiana Individual Income Tax Reform The graduated brackets of 1.85%, 3.50%, and 4.25% only applied to tax years 2022 through 2024, so if you’re paying a bill for one of those years, the older rates govern.5Louisiana Department of Revenue. Individual Income Tax Louisiana uses your federal adjusted gross income as the starting point for state taxable income, so anything that changes your federal return changes what you owe here too.
Penalties and Interest for Paying Late
Louisiana charges separate penalties for filing late and paying late. Both are capped at 25% of the total tax due in the aggregate.6Justia. Louisiana Code RS 47-1602 – Penalty for Failure to Make and File Returns or Remit Taxes
The late payment penalty on individual income tax is one-half of one percent (0.5%) of the unpaid amount per 30-day period or fraction of a period.6Justia. Louisiana Code RS 47-1602 – Penalty for Failure to Make and File Returns or Remit Taxes Most other taxes carry a 5% late payment rate, but individual income tax gets the slower rate. The 25% cap still applies.
The late filing penalty is 5% of the total tax due for the first 30 days, plus 5% for each additional 30-day period. At that pace the filing penalty alone reaches the 25% cap in five months. When both a filing and a payment penalty apply to the same 30-day window, you pay only the filing penalty for that period, and the combined penalties on a single return cannot exceed five 30-day periods total.6Justia. Louisiana Code RS 47-1602 – Penalty for Failure to Make and File Returns or Remit Taxes
Interest is separate from penalties. It accrues on any unpaid tax from the original due date until you pay in full, at a rate set annually at three percentage points above the Louisiana judicial interest rate, capped at 1.25% per month.7Louisiana State Legislature. Louisiana Code RS 47-1601 – Interest on Unpaid Taxes For 2025 the Department set the rate at 11.25% annually.2Louisiana Department of Revenue. Revenue Information Bulletin No. 25-001 – 2025 Interest Rate Collected on Unpaid Taxes On a $10,000 balance that’s roughly $1,125 in interest per year, and interest is treated as part of the tax debt itself. It generally cannot be reduced or forgiven, even if penalties are.
A separate 20% accuracy-related penalty can apply to any deficiency caused by negligence, with an additional 10% if you understated income by 25% or more of adjusted gross income. Willful disregard of Louisiana tax law raises the penalty to 40% of the deficiency.8Louisiana State Legislature. Louisiana Code RS 47-1604.1 – Accuracy-Related Penalty
If You Can’t Pay in Full
The Department of Revenue will set up an installment agreement rather than let a debt pile up untouched.9Louisiana Department of Revenue. Payment Plans You can apply through LaTAP or by contacting collections directly.
The rules divide payment plans into two categories.10Legal Information Institute. Louisiana Administrative Code Title 61 I-4919 – Installment Agreement for Payment of Tax An informal agreement is available when you owe less than $50,000 and can pay within 60 months, and it needs less documentation. A formal agreement is required when the balance is $50,000 or more, or when you need longer than 60 months, and the Department will ask for detailed financial records including bank statements, income records, and cash-flow data.
Either type carries a nonrefundable $105 setup fee. The fee is waived if your adjusted gross income is $25,000 or less.10Legal Information Institute. Louisiana Administrative Code Title 61 I-4919 – Installment Agreement for Payment of Tax Interest keeps accruing on the unpaid balance during the plan, so paying the debt off faster always costs less. Missing a scheduled payment can void the agreement and put you back in collections.
Getting Penalties Waived
The Secretary of Revenue can waive delinquency penalties in whole or in part when the failure to file or pay on time resulted from reasonable cause rather than negligence.11Louisiana State Legislature. Louisiana Code RS 47-1603 – Waiver of Penalty for Delinquent Filing or Delinquent Payment Requests go in writing with supporting documentation through the LDR’s electronic waiver system.12Louisiana Department of Revenue. Penalties
Certain situations get a statutory presumption of reasonable cause. If you obtained a filing extension, paid at least 90% of the tax shown on your return by the original due date, and remitted the remainder with your return, the penalty is presumed waivable.11Louisiana State Legislature. Louisiana Code RS 47-1603 – Waiver of Penalty for Delinquent Filing or Delinquent Payment The same applies when the IRS adjusts your federal return and you file an amended Louisiana return with payment within 90 days. The presumptions do not apply if the Department believes you acted in bad faith or intentionally disregarded the law, and a waiver covers only the penalty itself. Interest keeps running.
What Happens If You Ignore the Bill
Delinquent taxes trigger consequences beyond penalties and interest. A tax lien attaches automatically to all your property, real and personal, the moment a tax is assessed or a return is filed showing a balance due.13Justia. Louisiana Code RS 47-1577 – Tax Obligation to Constitute a Lien, Privilege and Mortgage The lien reaches after-acquired property, so anything you buy while the debt is outstanding also becomes encumbered. The Department can record notice of the lien in parish mortgage records, which damages your credit and makes selling or refinancing real estate difficult.
Louisiana also participates in the federal Treasury Offset Program, which matches delinquent state tax debts against federal payments you’re owed, most commonly a federal income tax refund.14Bureau of the Fiscal Service. Treasury Offset Program Once the state submits the debt, the federal government can intercept part or all of your federal refund and redirect it to Louisiana automatically.
Willful failure to collect, account for, or pay state taxes is a crime under Louisiana Revised Statute 47:1641, carrying a fine of up to $10,000, imprisonment for up to five years with or without hard labor, or both.15Justia. Louisiana Code RS 47-1641 – Criminal Penalty for Failing to Account for State Tax Moneys The operative word is “willfully.” An honest mistake or a temporary inability to pay does not trigger prosecution. Criminal charges are reserved for deliberate evasion and for people who collect taxes from others, such as sales tax from customers, and pocket the money instead of remitting it.