Mississippi State Tax Guide
Click your state on the map to see filing deadlines, extension rules, refund tracking, and payment options for that state. States shown in gray are coming soon.
Hover or tab a state to see its name.
Mississippi State Tax Guide
Mississippi Key deadlines (tax year 2025, return filed in 2026)
- Filing deadline: Apr 15, 2026
- Extension request deadline: Apr 15, 2026
- Extended return deadline: Oct 15, 2026 (6-month extension)
- Payment deadline: Apr 15, 2026
- Differs from federal: No
You must pay your estimated tax liability by April 15 to avoid interest and late-payment penalties.
If the due date for filing your return falls on a Saturday, Sunday, or legal holiday, your return is due by the next regular working day.
October 15, 2026 (6-month extension)
Payment rules
You must pay your estimated tax liability by April 15 to avoid interest and late-payment penalties via Mississippi online tax payments.
Payment options
Relevant Links
Filing forms
Extension
- Form 80-106
Mississippi Refund Tracking
Do I need to file?
You do not need to file a separate state form. As long as you file a federal extension (Form 4868), Mississippi honors it automatically. Just be sure to check the "Extension" box when you eventually file your Mississippi Form 80-105 - You must pay your estimated tax liability by April 15 to avoid interest and late-payment penalties.
Filing methods
Online filing
You can skip paperwork entirely by paying your estimated balance online through the Mississippi TAP. Making an "Extension Payment" through TAP electronically logs your extension.
Mail filing
By Mail: If you want to mail a check, you must print and fill out the Mississippi individual income tax forms. Select the "Extension Payment" box on the voucher and mail it with your check by April 15.
