Mississippi Business Tax Extension LLC / Partnership – S Corporation – C Corporation – Fiduciary
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Connect with a TaxPro →Mississippi Business Tax Extension – LLC / Partnership
Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request • LLC / PartnershipMississippi LLC & Partnership Tax Extension
Mississippi LLCs and partnerships with Mississippi-source income file with the Mississippi Department of Revenue. Mississippi recognizes the federal Form 7004 for pass-through entities, automatically extending the LLC and partnership return from March 16, 2026 to September 15, 2026. No separate Mississippi extension form is needed for LLCs and partnerships.
How the Extension Works
File IRS Form 7004 before March 16, 2026 to activate Mississippi's automatic pass-through extension to September 15, 2026. Pay any Mississippi pass-through tax by March 16, 2026 through the Mississippi TAP portal or mail to: Mississippi Department of Revenue, P.O. Box 23191, Jackson, MS 39225-3191.
Best Practices
- File IRS Form 7004 before March 16, 2026 to extend the Mississippi LLC or partnership return to September 15, 2026.
- Pay Mississippi pass-through entity tax by March 16, 2026 via the Mississippi TAP portal or mail.
- Evaluate entity-level withholding requirements for nonresident LLC members before March 16, 2026.
- File the completed Mississippi LLC or partnership return by September 15, 2026.
Working with a Tax Professional
LLC / Partnership returns carry unique complexities – a licensed CPA or Enrolled Agent can navigate the details and ensure your Mississippi return is filed accurately and on time.
- Get matched with a verified U.S.-based CPA or Enrolled Agent
- Upload your business documents via secure drag-and-drop
- Review your return with transparent, upfront pricing
- Your TaxPro files the Mississippi return by September 15, 2026
How to Pay
Mississippi requires online payment for tax amounts of $750 or more. Submit electronically via the Mississippi Online Tax Extension Payment portal. For amounts under $750, complete Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request and mail with your payment.
Mississippi Online Payment Portal
Submit electronically through the Mississippi Online Tax Extension Payment system. Required for all payments $750 and above.
Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request by Check
Download Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request and mail with your check or money order. Include your EIN and tax year on the check.
P.O. Box 23191
Jackson, MS 39225-3191
Late Filing & Payment Penalties
| Penalty Type | Amount |
|---|---|
| Failure to File | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay | 0.5% of unpaid tax per month. |
LLC / Partnership Quick Reference
| State Abbreviation | MS |
| Entity Type | LLC / Partnership |
| Extension Status | Automatic with approved IRS Form 7004 |
| Original Filing Deadline | March 16, 2026 |
| Extended Filing Deadline | September 15, 2026 |
| Payment Due | March 16, 2026 (100% of tax owed) |
| Payment Form | Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request |
| Online Payment | Mississippi Online Tax Extension Payment |
| State Agency | Mississippi Department of Revenue |
| Failure to File Penalty | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay Penalty | 0.5% of unpaid tax per month. |
Mississippi Business Tax Extension – S Corporation
Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request • S CorporationMississippi S Corporation Tax Extension
Mississippi S corporations file with the Mississippi Department of Revenue. Mississippi treats S corporations as pass-through entities and accepts the federal Form 7004 to extend the filing deadline from March 16, 2026 to September 15, 2026. No separate Mississippi S corporation extension form is required.
How the Extension Works
File IRS Form 7004 before March 16, 2026 to extend the Mississippi S corporation return to September 15, 2026. Pay any Mississippi S corporation tax by March 16, 2026 through the Mississippi TAP portal or mail to: Mississippi Department of Revenue, P.O. Box 23191, Jackson, MS 39225-3191.
Best Practices
- File IRS Form 7004 before March 16, 2026 to extend the Mississippi S corporation return to September 15, 2026.
- Pay Mississippi S corporation tax by March 16, 2026 via the Mississippi TAP portal or mail.
- Check Mississippi withholding or composite requirements for nhnresident S corporation shareholders.
- File the completed Mississippi S corporation return by September 15, 2026.
Working with a Tax Professional
S Corporation returns carry unique complexities – a licensed CPA or Enrolled Agent can navigate the details and ensure your Mississippi return is filed accurately and on time.
- Get matched with a verified U.S.-based CPA or Enrolled Agent
- Upload your business documents via secure drag-and-drop
- Review your return with transparent, upfront pricing
- Your TaxPro files the Mississippi return by September 15, 2026
How to Pay
Mississippi requires online payment for tax amounts of $750 or more. Submit electronically via the Mississippi Online Tax Extension Payment portal. For amounts under $750, complete Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request and mail with your payment.
Mississippi Online Payment Portal
Submit electronically through the Mississippi Online Tax Extension Payment system. Required for all payments $750 and above.
Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request by Check
Download Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request and mail with your check or money order. Include your EIN and tax year on the check.
P.O. Box 23191
Jackson, MS 39225-3191
Late Filing & Payment Penalties
| Penalty Type | Amount |
|---|---|
| Failure to File | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay | 0.5% of unpaid tax per month. |
S Corporation Quick Reference
| State Abbreviation | MS |
| Entity Type | S Corporation |
| Extension Status | Automatic with approved IRS Form 7004 |
| Original Filing Deadline | March 16, 2026 |
| Extended Filing Deadline | September 15, 2026 |
| Payment Due | March 16, 2026 (100% of tax owed) |
| Payment Form | Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request |
| Online Payment | Mississippi Online Tax Extension Payment |
| State Agency | Mississippi Department of Revenue |
| Failure to File Penalty | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay Penalty | 0.5% of unpaid tax per month. |
Mississippi Business Tax Extension – C Corporation
Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request • C CorporationMississippi C Corporation Tax Extension
Mississippi C corporations pay both corporate income tax and Mississippi franchise tax to the Mississippi Department of Revenue. To extend the C corporation filing deadline from April 15, 2026 to October 15, 2026, Mississippi requires its own extension form–Form 83-180. Filing only a federal extension is not sufficient to extend the Mississippi C corporation return.
How the Extension Works
File Mississippi Form 83-180 before April 15, 2026 to obtain the extension to October 15, 2026. Pay Mississippi corporate income tax and franchise tax by April 15, 2026 through the Mississippi TAP portal or mail to: Mississippi Department of Revenue, P.O. Box 23191, Jackson, MS 39225-3191.
Best Practices
- File Mississippi Form 83-180 before April 15, 2026–a federal extension alone does not extend the Mississippi C corporation deadline.
- Pay Mississippi corporate income tax and franchise tax by April 15, 2026 through the TAP portal or by mail.
- Calculate Mississippi franchise tax on Mississippi-employed capital separately from income tax before the April 15, 2026 payment deadline.
- File the completed Mississippi C corporation return by October 15, 2026.
Working with a Tax Professional
C Corporation returns carry unique complexities – a licensed CPA or Enrolled Agent can navigate the details and ensure your Mississippi return is filed accurately and on time.
- Get matched with a verified U.S.-based CPA or Enrolled Agent
- Upload your business documents via secure drag-and-drop
- Review your return with transparent, upfront pricing
- Your TaxPro files the Mississippi return by October 15, 2026
How to Pay
Mississippi requires online payment for tax amounts of $750 or more. Submit electronically via the Mississippi Online Tax Extension Payment portal. For amounts under $750, complete Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request and mail with your payment.
Mississippi Online Payment Portal
Submit electronically through the Mississippi Online Tax Extension Payment system. Required for all payments $750 and above.
Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request by Check
Download Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request and mail with your check or money order. Include your EIN and tax year on the check.
P.O. Box 23191
Jackson, MS 39225-3191
Late Filing & Payment Penalties
| Penalty Type | Amount |
|---|---|
| Failure to File | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay | 0.5% of unpaid tax per month. |
C Corporation Quick Reference
| State Abbreviation | MS |
| Entity Type | C Corporation |
| Extension Status | Automatic with approved IRS Form 7004 |
| Original Filing Deadline | April 15, 2026 |
| Extended Filing Deadline | October 15, 2026 |
| Payment Due | April 15, 2026 (100% of tax owed) |
| Payment Form | Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request |
| Online Payment | Mississippi Online Tax Extension Payment |
| State Agency | Mississippi Department of Revenue |
| Failure to File Penalty | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay Penalty | 0.5% of unpaid tax per month. |
Mississippi Business Tax Extension – Fiduciary
Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request • FiduciaryMississippi Fiduciary Tax Extension
Mississippi fiduciary income tax returns for trusts and estates are filed with the Mississippi Department of Revenue. Mississippi follows the federal extension for fiduciary returns, extending the filing deadline from April 15, 2026 to October 15, 2026 when a federal fiduciary extension is in place. No separate Mississippi fiduciary extension form is required.
How the Extension Works
File a federal fiduciary extension before April 15, 2026. Mississippi extends the fiduciary return deadline to October 15, 2026 based on the federal extension. Pay any Mississippi fiduciary income tax by April 15, 2026 through the Mississippi TAP portal or mail to: Mississippi Department of Revenue, P.O. Box 23191, Jackson, MS 39225-3191.
Best Practices
- Secure a federal fiduciary extension before April 15, 2026 to extend the Mississippi fiduciary return to October 15, 2026.
- Pay Mississippi fiduciary income tax by April 15, 2026 via the Mississippi TAP portal or mail.
- Collect trust or estate income records early to support an accurate Mississippi extension payment by April 15, 2026.
- File the completed Mississippi fiduciary return by October 15, 2026.
Working with a Tax Professional
Fiduciary returns carry unique complexities – a licensed CPA or Enrolled Agent can navigate the details and ensure your Mississippi return is filed accurately and on time.
- Get matched with a verified U.S.-based CPA or Enrolled Agent
- Upload your business documents via secure drag-and-drop
- Review your return with transparent, upfront pricing
- Your TaxPro files the Mississippi return by October 15, 2026
How to Pay
Mississippi requires online payment for tax amounts of $750 or more. Submit electronically via the Mississippi Online Tax Extension Payment portal. For amounts under $750, complete Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request and mail with your payment.
Mississippi Online Payment Portal
Submit electronically through the Mississippi Online Tax Extension Payment system. Required for all payments $750 and above.
Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request by Check
Download Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request and mail with your check or money order. Include your EIN and tax year on the check.
P.O. Box 23191
Jackson, MS 39225-3191
Late Filing & Payment Penalties
| Penalty Type | Amount |
|---|---|
| Failure to File | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay | 0.5% of unpaid tax per month. |
Fiduciary Quick Reference
| State Abbreviation | MS |
| Entity Type | Fiduciary |
| Extension Status | Automatic with approved IRS Form 7004 |
| Original Filing Deadline | April 15, 2026 |
| Extended Filing Deadline | October 15, 2026 |
| Payment Due | April 15, 2026 (100% of tax owed) |
| Payment Form | Form 83-180 | Mississippi Corporate Income and Franchise Tax Extension Request |
| Online Payment | Mississippi Online Tax Extension Payment |
| State Agency | Mississippi Department of Revenue |
| Failure to File Penalty | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay Penalty | 0.5% of unpaid tax per month. |
Extended? Your Mississippi Business Return Deadline Is Coming Up.
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