Louisiana business tax extension
Louisiana honors the federal extension: filing Form 7004 with the IRS also extends Form CIT-620, with no Louisiana extension form. The federal extension is Form 7004, due for calendar-year corporations and for partnerships and S corporations. In general, an extension gives you more time to file, not more time to pay.
Last updated · From Louisiana's own forms, instructions and laws, cited below
Does Louisiana accept the federal extension?
A federal extension carries over: filing Form 7004 with the IRS also extends the Louisiana return, with no separate Louisiana extension form.
Louisiana's rules for each business return, as its own instructions and laws state them:
Corporations
- Return
- Form CIT-620, Louisiana Corporation Income Tax Return
- Due date
- The 15th day of the 5th month after the tax year ends (May 15 for a calendar year)
- Extension
- A federal extension carries over: filing Form 7004 with the IRS also extends the Louisiana return, with no separate Louisiana extension form. The extension applies only if a federal extension was requested on time, and the return must say so (mark the box on Form CIT-620). If the IRS denies the federal extension, the Louisiana extension is void.
- Extension length
- 6 months
- Extended due date
- The 15th day of the 11th month after the tax year ends (November 15 for a calendar year)
- Payment
- The tax is due by the original due date, even with an extension. To pay with the extension: Form CIT-620EXT-V, Corporation Income Tax Extension Payment Voucher, or electronically at latap.revenue.louisiana.gov (electronic funds transfer is required for payments over $5,000).
Partnerships
- Return
- Form IT-565, Partnership Return of Income
- Due date
- The 15th day of the 5th month after the tax year ends (May 15 for a calendar year)
- Extension
- Louisiana extends the return automatically, with no extension request and no federal extension needed.
- Extension length
- 6 months
- Extended due date
- The 15th day of the 11th month after the tax year ends (November 15 for a calendar year)
- Payment
- The tax is due by the original due date, even with an extension. To pay with the extension: Form R-6467V, Partnership Automatic Extension Composite Payment Voucher, or electronically at latap.revenue.louisiana.gov.
Estates and trusts
- Return
- Form IT-541, Fiduciary Income Tax Return
- Due date
- The 15th day of the 5th month after the tax year ends (May 15 for a calendar year)
- Extension
- Louisiana extends the return automatically, with no extension request and no federal extension needed.
- Extension length
- 6 months
- Extended due date
- The 15th day of the 11th month after the tax year ends (November 15 for a calendar year)
- Payment
- The tax is due by the original due date, even with an extension. To pay with the extension: Form R-6466V, Fiduciary Income Tax Electronically Filed Extension Payment Voucher, or electronically at latap.revenue.louisiana.gov.
When a due date in Louisiana falls on a weekend or legal holiday, it moves to the next business day. Louisiana's holidays can differ from the federal ones, so a rule not tied to a federal date is given without a computed date.
When is the federal business extension due?
Corporations, S corporations, partnerships, multi-member LLCs, estates and trusts extend their federal return with Form 7004, filed by the return's original due date. The extension is automatic: no reason is needed and the IRS doesn't approve it. We e-file it for a flat $9.95. These are the 2027 dates for calendar-year 2026 returns:
| Return | Who files | File the extension by | Extended to |
|---|---|---|---|
| Form 1065 Partnerships & multi-member LLCs, Form 7004 | 6 months | ||
| Form 1120-S S corporations (and LLCs taxed as S corps), Form 7004 | 6 months | ||
| Form 1120 C corporations (and LLCs taxed as C corps), Form 7004 | 6 months | ||
| Form 1041 Estates & trusts, Form 7004 | 5½ months | ||
| Form 990, 990-EZ, 990-PF Tax-exempt organizations & private foundations, Form 8868 | May 15, 2027 is a Saturday | 6 months |
Federal dates follow the IRS rule: a deadline on a weekend or legal holiday moves to the next business day. A fiscal-year business counts from its own year-end; see the fiscal-year deadline guide.
Tax-exempt organizations extend the 990 series with Form 8868, not Form 7004. Each return needs its own extension, so extending a business return does not extend its owners' personal returns.
Does an extension give more time to pay?
No. A federal extension moves the filing deadline only: tax owed is due by the original due date, and the IRS charges interest and the late-payment penalty on anything paid after it. Louisiana's instructions say the same for its returns: a Louisiana extension doesn't move the payment deadline. More in does an extension give you more time to pay?
Where are Louisiana's forms and instructions?
On the Louisiana Department of Revenue website, which has the current forms, instructions and online services. The rules on this page are summarized from the sources below. We e-file the federal extension; the Louisiana return and any Louisiana extension request go to the state.
Louisiana extension FAQ
Does Louisiana accept the federal business tax extension?
A federal extension carries over: filing Form 7004 with the IRS also extends the Louisiana return, with no separate Louisiana extension form. The extension is 6 months. The extension applies only if a federal extension was requested on time, and the return must say so (mark the box on Form CIT-620). If the IRS denies the federal extension, the Louisiana extension is void.
When is the Louisiana Form CIT-620 due?
The 15th day of the 5th month after the tax year ends (May 15 for a calendar year).
Does a Louisiana extension give more time to pay?
No. The tax is due by the original due date, even with an extension. To pay with the extension: Form CIT-620EXT-V, Corporation Income Tax Extension Payment Voucher, or electronically at latap.revenue.louisiana.gov (electronic funds transfer is required for payments over $5,000).
Does a Louisiana business still need a federal extension?
Yes, to get more time for its federal return: Form 7004, filed by April 15, 2027 for a calendar-year corporation or March 15, 2027 for a partnership or S corporation. In Louisiana, that federal extension also extends the state return.
Sources
- Home, Louisiana Department of Revenue, read
- CIT-620i: Louisiana 2025 Corporation Income & 2026 S Corporation Information Return of Income Tax Instructions (revised 4/10/2026) (PDF), read
- CIT-620EXT-V-SL: Corporation Income Tax Extension Payment Voucher (1/26) (PDF), read
- IT-565i: Instructions for Partnership Return of Income Tax Year 2025 (PDF), read
- IT-541i: General Information and Instructions for Completing Form IT-541 Fiduciary Income Tax Return (1/26 revised 8/26) (PDF), read
- Louisiana Administrative Code Title 61, Part III, Chapter 25. Returns (§2501–§2507 filing extensions), June 2023 (PDF), read
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