Louisiana tax deadlines in 2026: filing dates and estimated payments
Deadlines that fall in calendar 2026: the 2025 return and the 2026 estimated payments. Different year? See Louisiana 2025 →
Louisiana deadlines in 2026
| 2025 individual return due | May 15, 2026 |
|---|---|
| Extended filing deadline | November 15, 2026 |
| Payment due | May 15, 2026, extension or not |
| Final 2025 estimated payment | January 15, 2026 |
| 2026 estimated payments | April 15, 2026 · June 15, 2026 · September 15, 2026 · January 15, 2027 |
Individual returns are due May 15 (not April 15). Automatic 6-month extension to November 15; payment still due May 15. Estimated installments follow the standard quarterly dates.
Louisiana estimated tax payments in 2026
Your estimated Louisiana income tax after credits and withholding is expected to exceed $1,000 for single filers or $2,000 for joint filers (R.S. 47:116).
| Q1 (2026 tax year) | April 15, 2026 |
|---|---|
| Q2 (2026 tax year) | June 15, 2026 |
| Q3 (2026 tax year) | September 15, 2026 |
| Q4 (2026 tax year) | January 15, 2027 |
| Voucher | Form IT-540ES |
| Underpayment safe harbor | No underpayment penalty on an installment if cumulative timely payments equal at least the lesser of 100% of the prior-year tax (12-month year), the tax that would have been due for the prior year on current facts, or 90% (66.66% for farmers and fishermen) of the current-year tax on an annualized basis. |
| Pay online | latap.revenue.louisiana.gov |
Pay in full with the declaration or in four equal installments; The January 15 declaration/installment is excused if the return is filed and paid in full by January 31, 2027. Underpayment penalty is 12% per year of the underpayment. Farmers/fishermen (2/3 of gross income) may pay all by January 15, 2027 or file and pay by March 1, 2027. Payment options also include Louisiana File Online and the credit-card portal. Louisiana has no 110% high-income tier.
Source: legis.la.gov and revenue.louisiana.gov, read September 3, 2026. “the second and third installments on or before June 15 and September 15 of the taxable year, and the fourth installment on or before January 15 of the succeeding taxable year”
All 51 jurisdictions in one table: state estimated tax payment dates for 2026.
Louisiana extensions
Every state's rule in one table: which states accept the federal extension in 2026.
| Does Louisiana accept the federal extension? | Not needed. The state extends everyone automatically. |
|---|---|
| Original due date | May 15, 2026 |
| Extended due date | November 15, 2026 |
| Payment | Still due May 15, 2026. The extension is to file, not to pay. The automatic extension applies only to filing; payments made after May 15 are subject to penalties and interest. |
| How to get it | Nothing to file; the extension is automatic under Act 410 of 2022, and any payment can be made through LaTAP or the online extension-payment page. |
The Department publishes the extended date as November 15; November 15, 2026 is a Sunday, so the return is due the next business day, Monday November 16, 2026. The extension is automatic under Act 410 of 2022.
Source: revenue.louisiana.gov, read September 3, 2026. “If you know you cannot file your return by the due date, you do not need to file for an extension. For calendar year filers the extension will be to November 15th.”
Federal deadlines in 2026
| 2025 Form 1040 | April 15, 2026 · extension October 15, 2026 |
|---|---|
| 2025 S-corp (1120-S) & partnership (1065) | March 16, 2026 |
| 2025 C-corp (Form 1120) | April 15, 2026 |
| 2026 federal estimated payments (1040-ES) | April 15, 2026 · June 15, 2026 · September 15, 2026 · January 15, 2027 |
Source: IRS Publication 509 and Form 1040-ES instructions, irs.gov.
Frequently asked questions
When are Louisiana state taxes due in 2026?
Your 2025 Louisiana individual income tax return is due May 15, 2026. If that date falls on a weekend or legal holiday, the deadline moves to the next business day. An extension moves the filing deadline to November 15, 2026, but any tax owed is still due on the original date.
When are Louisiana estimated tax payments due in 2026?
Louisiana estimated payments for the 2026 tax year are due April 15, 2026, June 15, 2026, September 15, 2026, January 15, 2027. Use Form IT-540ES or pay online. The final installment for 2025 was due January 15, 2026.
Does Louisiana accept the federal extension?
Not needed. The state extends everyone automatically. The extended filing deadline is November 15, 2026, and tax is still due by May 15, 2026.
Does a Louisiana extension give me more time to pay?
No. An extension extends the time to file, not to pay. To avoid penalties and interest, pay what you expect to owe by May 15, 2026.
Dates are the statutory deadlines that fall in 2026 and move to the next business day when they land on a weekend or holiday. Each section links to the source it was checked against. Always confirm with the Louisiana tax agency or the IRS before relying on a date. This is general information, not tax advice.