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Mississippi Individual Income Tax Filing deadlines and extensions for 2025.
If you are a resident or have been involved in significant business operations within Mississippi, you might be required to file Mississippi State Taxes. We look at the most important tax deadlines and tax extensions for Mississippi in 2025.
If your clients are residents, part-year residents, or have been involved in significant business operations within Mississippi, they might be required to file Mississippi State Taxes. This document outlines the most important tax deadlines and tax extensions for Mississippi in 2025.
Mississippi C Corporation Tax Deadlines for 2025
You must file and pay Corporate Income Taxes in Mississippi by April 15, 2025.
Extension to File Taxes in Mississippi for 2025
The Extension Deadline for Mississippi corporate income tax returns is October 15, 2025.
Mississippi grants automatic extensions for filing corporate income tax returns, meaning you do not need to file for an extension separately.
This is an extension to FILE, not an extension to PAY – payment is still due by April 15, 2025.
Mississippi S Corporation & Partnership Tax Deadlines for 2025
The deadline for filing and payment in Mississippi is March 15, 2025.
Extension to File S Corporation & Partnership Taxes in Mississippi for 2025
The Extension Deadline for Mississippi S Corporation or Partnership tax returns is September 15, 2025.
Mississippi automatically grants a six-month extension for filing pass-through entity tax returns, eliminating the need for separate extension filings.
This is an extension to FILE, not an extension to PAY – payment is still due by March 15, 2025.
Estimated Tax Deadline for Mississippi 2025
Estimated tax payments are due:
Individual Tax Deadline for Mississippi 2025
You must file and pay individual income taxes in Mississippi by April 15, 2025.
Extension to File Taxes in Mississippi for 2025
The Extension Deadline for Mississippi individual income tax returns is October 15, 2025.
Mississippi grants an automatic six-month extension for filing personal income taxes, without the need for a separate extension application.
This is an extension to FILE, not an extension to PAY – payment is still due by April 15, 2025.
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The material discussed on this page is meant for general illustration and/or informational purposes only and is not to be construed as investment, tax, or legal advice. You must exercise your own independent professional judgment, recognizing that advice should not be based on unreasonable factual or legal assumptions or unreasonably rely upon representations of the client or others. Further, any advice you provide in connection with tax return preparation must comply in full with the requirements of IRS Circular 230.
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