Louisiana estimated tax due dates for 2026
Louisiana estimated income tax payments for tax year 2026 are due April 15, 2026, June 15, 2026, September 15, 2026, January 15, 2027. That matches the federal schedule. Below: who has to pay, how to avoid an underpayment penalty and where to pay, with the official source.
| Payment | Louisiana due date |
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| 1 | |
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Federal 2026 estimated tax due dates, for comparison: April 15, 2026, June 15, 2026, September 15, 2026, January 15, 2027.
Who must pay Louisiana estimated tax?
Taxpayers must make a declaration of estimated income tax and pay estimated tax payments if their estimated Louisiana income tax after credits and taxes withheld is expected to exceed $1,000 for single filers and $2,000 for joint filers as required by Revised Statute 47:116.
How do you avoid a Louisiana underpayment penalty?
Underpayment penalty (12% per year) is not imposed if timely payments equal or exceed the least of: the tax on the preceding year's return (12-month year, return filed); tax figured on the preceding year's facts at current status/exemptions; or 90% (66.66% farmers/fishermen) of annualized or actual current-year tax. Required installment is 25% of the required annual payment. No 110% rule. Filing the return and paying in full by January 31 replaces the January 15 installment.
How much should you pay?
Start with your federal estimate: the free Quarterly Estimated Tax Calculator works out your 2026 federal payments and safe harbor. Louisiana figures its own tax, so the state amount is separate.
