2027 Louisiana Tax Deadlines

Last updated: July 29, 2026

Key Louisiana tax dates at a glance

• April 15, 2027: First Individual estimated payment.
• June 15, 2027: Second Individual estimated payment.
• September 15, 2027: Third Individual estimated payment.
• January 18, 2028: Fourth Individual estimated payment.
• April 17, 2028: Calendar-year Partnership Form IT-565 return and payment.
• May 15, 2028: Calendar-year C Corporation, S Corporation, and Individual returns and payments.
• October 16, 2028: Extended Partnership return, file only.
• November 15, 2028: Extended C Corporation, S Corporation, and Individual returns, file only.

When are Louisiana taxes due in 2027?

Louisiana 2027 calendar-year Individual and C Corporation returns are generally due May 15, 2028. S Corporation filings are due May 15, 2028, while Partnership Form IT-565 is due April 17, 2028 because April 15 falls on a Saturday.

When is the Louisiana C Corporation return due?

Louisiana C Corporations should plan around May 15, 2028 for the calendar-year corporate-facing return, tax, or business-level filing noted in this page.

• Form CIFT-620: Louisiana Corporation Income and Franchise Tax Return.

What are Louisiana C Corporation extension rules?

The extended filing deadline for the main calendar-year Louisiana corporate-facing return is November 15, 2028. The extension is to file only, and tax or required payments remain due by May 15, 2028.

When are Louisiana S Corporation and Partnership returns due?

Louisiana S Corporations should plan around May 15, 2028, and Partnerships should plan around April 17, 2028.

Which Louisiana pass-through forms are required?

Use the applicable Louisiana pass-through return and related payment or owner-reporting forms for the entity type and election facts.

• Form CIFT-620: S Corporation information return.
• Form R-6980: Pass-through entity tax election when applicable.
• Form IT-565: Partnership return.

What are Louisiana pass-through extension rules?

The extended filing deadline for calendar-year Louisiana S Corporation and Partnership returns is November 15, 2028 for S Corporations and October 16, 2028 for Partnerships. The extension is to file only, so tax, withholding, composite, or entity-level payments should be handled by the original deadline.

When is the Louisiana Individual income tax return due?

Calendar-year Louisiana Individual income tax returns and payments are due May 15, 2028.

• Form IT-540: Resident Individual income tax return.
• Form IT-540B: Nonresident or part-year resident return.
• Form IT-540ES: Individual estimated tax vouchers.

What Louisiana Individual rate and residency issues should be checked?

Tax year 2027 Individual instructions should be checked for final rate tables, standard deductions or exemptions, residency rules, retirement-income treatment, credits, estimated-payment thresholds, and any filing-year changes specific to Louisiana.

When are Louisiana estimated payments due?

Louisiana estimated-payment planning should be separated from franchise tax, PTET, withholding, and industry-specific taxes.

• April 15, 2027: First estimated payment.
• June 15, 2027: Second estimated payment.
• September 15, 2027: Third estimated payment.
• January 18, 2028: Fourth estimated payment.

Who must make Louisiana estimated payments?

Taxpayers should use the final 2027 Louisiana instructions to confirm estimated-payment thresholds, safe-harbor rules, credits, withholding, pass-through owner treatment, and electronic-payment requirements.

What are Louisiana extension deadlines?

Louisiana extension deadlines are November 15, 2028 for S Corporations and October 16, 2028 for Partnerships for pass-through filings, November 15, 2028 for corporate-facing filings, and November 15, 2028 for Individual returns. Extensions add filing time only; payment deadlines remain tied to the original return due dates.

What Louisiana-specific rules should tax professionals watch for 2027?

Beyond the core return deadlines, Louisiana tax professionals should track state-specific rate, credit, local-tax, industry, and filing-method rules before the 2027 season locks.

• Louisiana's recent tax reform created a 3% flat Individual income tax rate and a 5.5% corporate income tax rate.
• Estimated payments generally apply when expected Louisiana tax after credits and withholding is at least $1,000 for a single filer or $2,000 for a joint return.
• Use Louisiana Taxpayer Access Point to file, pay, manage notices, and verify account activity, and confirm mandatory electronic filing for each return type.
• Eligible S Corporations and Partnerships can elect entity-level taxation; track the election, owner reporting, and payment timing together.
• Louisiana sourcing, apportionment, credits, and industry-specific taxes can create obligations beyond the income-tax return.
• Oil, natural-gas, mineral, and related activities can create severance-tax, royalty, withholding, and registration obligations beyond income tax.
• Form CIFT-620 combines corporation income and franchise tax reporting, so nexus, capital measures, apportionment, and group-reporting consequences should be reviewed together.
• Industrial Tax Exemption, Enterprise Zone, Quality Jobs, research-and-development, and motion-picture incentives have distinct approvals, payroll or investment tests, and reporting requirements.
• Agriculture, seafood, fisheries, and coastal operations may face industry-specific exemptions, credits, licenses, and local taxes.
• Federal and state disaster declarations can change filing dates, payment relief, loss treatment, and recordkeeping requirements.
• Louisiana provides exclusions or special treatment for certain retirement income, including qualifying government benefits.

Instead AI helps tax teams treat Louisiana due dates as operational work, not a static checklist.

Teams comparing Instead tax software with spreadsheet trackers should keep return type, payment status, extension status, and source-backed state rules together. Use Instead tax AI as a review surface for deadline orchestration, while AI tax software and tax advisor AI prompts support professional judgment rather than replacing state-source review.

What sources support these Louisiana dates?

Use these official or primary Louisiana tax sources to confirm the return, payment, extension, and state-specific rules above before publication.

• Louisiana business tax forms.
• Louisiana Individual tax forms.
• Louisiana Taxpayer Access Point.
• Louisiana income tax extension payments.

Keep Louisiana's May filing calendar under control

Instead's AI-driven tax platform helps Louisiana teams coordinate return work, payment review, extensions, and filing follow-through before deadlines move from planning to execution.

For Louisiana practices, research, resolution, and multi-entity help connect research, planning, and operational handoffs without duplicating deadline data. Built for tax professionals who want source-backed state deadline control across clients, entities, and reviewer workflows.